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<h1>Developing Geospatial software with Python, Part 2</h1>
<h2>GFOSS Day, Foligno - 18/19 November 2010</h2>
</div>
</div>
<div class="presentation">
<div class="slide" id="slide0">
<h1 class="title">Developing Geospatial software with Python, Part 2</h1>
<h2 class="subtitle" id="alessandro-pasotti-apasotti-gmail-com-paolo-corti-pcorti-gmail-com">Alessandro Pasotti (<a class="reference external" href="mailto:apasotti@gmail.com">apasotti@gmail.com</a>), Paolo Corti (<a class="reference external" href="mailto:pcorti@gmail.com">pcorti@gmail.com</a>)</h2>
<p>License:
Creative Commons Attribution - Share Alike 3.0</p>
</div>
<div class="slide" id="building-blocks-overview">
<h1>Building blocks: overview</h1>
<img alt="images/lib_schema.png" src="images/lib_schema.png" />
<div class="sidebar">
<p class="first sidebar-title">Classification</p>
<ul class="last simple">
<li>architecture: pure python / binary wrappers, <em>pythonicity</em></li>
<li>application interaction: GUI / headless</li>
<li>input/output formats</li>
<li>performances and scalability (mostly unexplored)</li>
<li>documentation, maturity, support, community</li>
</ul>
</div>
</div>
<div class="slide" id="building-blocks-webservices">
<h1>Building blocks: WebServices</h1>
<div class="sidebar">
<p class="first sidebar-title">WS babel</p>
<ul class="last simple">
<li>XML</li>
<li>Json</li>
<li>plain text</li>
<li>REST</li>
</ul>
</div>
<p>Only a selection from an huge set:</p>
<ul class="incremental simple">
<li>OWS (OGC Web Services)</li>
<li>GeoNames</li>
<li>Google Maps</li>
<li>Yahoo Maps</li>
</ul>
</div>
<div class="slide" id="building-blocks-ogc-web-services">
<h1>Building blocks: OGC Web Services</h1>
<div class="sidebar">
<p class="first sidebar-title">Libs</p>
<ul class="last simple">
<li>OWSlib (client)</li>
<li>Mapnik (server)</li>
<li>Mapscript (both)</li>
<li>QGIS (both)</li>
</ul>
</div>
<p>Open Geospatial Consortium defines the following standards for geospatial web services (OWS):</p>
<ul class="incremental simple">
<li><em>WMS</em> (Web Map Service)</li>
<li><em>WFS</em> (Web Feature Service)</li>
<li><em>WCS</em> (Web Coverage Service)</li>
<li><em>CSW</em> (Catalogue Service for Web)</li>
<li><em>WPS</em> (Web Processing Service)</li>
<li>many others...</li>
</ul>
<p>KVP/XML requests</p>
</div>
<div class="slide" id="ogc-ws-wms">
<h1>OGC WS: WMS</h1>
<blockquote>
<em>Web Map Service</em> (WMS) is a standard protocol for serving georeferenced map images over the Internet that are generated by a map server using data (vector and cover) from a GIS database</blockquote>
<img alt="images/wms.png" src="images/wms.png" />
</div>
<div class="slide" id="ogc-ws-wms-operations">
<h1>OGC WS: WMS operations</h1>
<ul class="simple">
<li><em>GetCapabilities</em> - returns parameters about the WMS and the available layers (*)</li>
<li><em>GetMap</em> - with parameters provided (srs, format, width, eight, bbox, layers...) returns a map image (*)</li>
<li><em>GetFeatureInfo</em> - with parameters provided returns feature informations (**)</li>
<li><em>DescribeLayer</em></li>
<li><em>GetLegendGraphic</em></li>
</ul>
<p>(*) basic WMS
(**) queryable WMS</p>
</div>
<div class="slide" id="ogc-ws-wms-getmap-operation">
<h1>OGC WS: WMS GetMap operation</h1>
<img alt="images/duomo.jpg" class="align-right" src="images/duomo.jpg" />
<p>main parameters: layers, styles, srs, bbox, width, height, format</p>
<p>sample GetMap operation (output is an image):</p>
<p><a class="reference external" href="http://wms.pcn.minambiente.it/cgi-bin/mapserv.exe?map=/ms_ogc/service/ortofoto_colore_06_f32.map&layers=ortofoto_colore_06&styles=&srs=EPSG:32632&format=image/jpeg&request=GetMap&bgcolor=0xFFFFFF&height=300&width=300&version=1.1.1&bbox=514832,5034338,515032,5034548&exceptions=application/vnd.ogc.se_xml&transparent=FALSE">http://wms.pcn.minambiente.it/cgi-bin/mapserv.exe?map=/ms_ogc/service/ortofoto_colore_06_f32.map&layers=ortofoto_colore_06&styles=&srs=EPSG:32632&format=image/jpeg&request=GetMap&bgcolor=0xFFFFFF&height=300&width=300&version=1.1.1&bbox=514832,5034338,515032,5034548&exceptions=application/vnd.ogc.se_xml&transparent=FALSE</a></p>
</div>
<div class="slide" id="ogc-ws-wfs">
<h1>OGC WS: WFS</h1>
<blockquote>
<em>Web Feature Service</em> (WFS) provides a standard interface allowing requests for geographical features across the web using platform-independent calls</blockquote>
<p>The WFS specification defines interfaces for describing data manipulation operations of geographic features. Data manipulation operations include the ability to:</p>
<ul class="incremental simple">
<li>Get or Query features based on spatial and non-spatial constraints</li>
<li>Create a new feature instance (WFS-T)</li>
<li>Delete a feature instance (WFS-T)</li>
<li>Update a feature instance (WFS-T)</li>
</ul>
</div>
<div class="slide" id="ogc-ws-wfs-operations">
<h1>OGC WS: WFS operations</h1>
<ul class="incremental simple">
<li>GetCapabilities (1)</li>
<li>DescribeFeatureType (1)</li>
<li>GetFeature (1)</li>
<li>GetGmlObject (2)</li>
<li>Transaction (3)</li>
<li>LockFeature (3)</li>
</ul>
<ol class="arabic simple">
<li>basic WFS - read only</li>
<li>XLink WFS (complex features traversal)</li>
<li>transaction WFS (WFS-T)</li>
</ol>
</div>
<div class="slide" id="ogc-ws-wfs-getfeature-operation">
<h1>OGC WS: WFS GetFeature operation</h1>
<p>main parameters: typeName, maxfeatures, query...</p>
<p>sample GetFeature operation (output is GML)</p>
<p><a class="reference external" href="http://wms.pcn.minambiente.it/cgi-bin/mapserv.exe?map=/ms_ogc/wfs/regioni_wfs_f33.map&service=WFS&typename=regioni_f33&request=GetFeature&version=1.0.0">http://wms.pcn.minambiente.it/cgi-bin/mapserv.exe?map=/ms_ogc/wfs/regioni_wfs_f33.map&service=WFS&typename=regioni_f33&request=GetFeature&version=1.0.0</a></p>
</div>
<div class="slide" id="ogc-ws-wcs">
<h1>OGC WS: WCS</h1>
<blockquote>
Web Coverage Service Interface Standard (WCS) provides an interface allowing requests for geographical coverages across the web using platform-independent calls</blockquote>
<p>Operations:</p>
<ul class="incremental simple">
<li>GetCapabilities</li>
<li>DescribeCoverage</li>
<li>GetCoverage</li>
</ul>
</div>
<div class="slide" id="ogc-ws-wcs-getcoverage-operation">
<h1>OGC WS: WCS GetCoverage operation</h1>
<p>main parameters: coverage, crs, bbox, time, width, height, resx, resy, format</p>
<p>GetCoverage operation (output is a coverage):</p>
<p><a class="reference external" href="http://my.host.com/cgi-bin/mapserv?map=mywcs.map&SERVICE=wcs&VERSION=1.0.0&REQUEST=GetCoverage&coverage=bathymetry&CRS=EPSG:42304&BBOX=-2200000,-712631,3072800,3840000&WIDTH=3199&HEIGHT=2833&FORMAT=GTiff">http://my.host.com/cgi-bin/mapserv?map=mywcs.map&SERVICE=wcs&VERSION=1.0.0&REQUEST=GetCoverage&coverage=bathymetry&CRS=EPSG:42304&BBOX=-2200000,-712631,3072800,3840000&WIDTH=3199&HEIGHT=2833&FORMAT=GTiff</a></p>
<p>Note: at least one time or bbox parameter is needed</p>
</div>
<div class="slide" id="ogc-ws-csw">
<h1>OGC WS: CSW</h1>
<blockquote>
Catalogue Service</blockquote>
<ul class="incremental simple">
<li>defines common interfaces to discover, browse, query and manage metadata about data, services, and other potential resources</li>
<li>defines a query language (similar to the SQL "Where Clause") to be supported by all OGC Catalogue Interfaces in order to support search interoperability</li>
<li>common queryable elements - request (subject, title, abstract, anytext (1), format, identifier, modified, type, boundingbox, CRS...)</li>
<li>core returnable properties -response (title, creator, subject, description, publisher, contributor, date, type...)</li>
</ul>
</div>
<div class="slide" id="ogc-ws-csw-operations">
<h1>OGC WS: CSW operations</h1>
<p>Operations:</p>
<ul class="incremental simple">
<li>GetCapabilities</li>
<li>DescribeRecord</li>
<li>GetDomain (*)</li>
<li>GetRecords</li>
<li>GetRecordById</li>
<li>Transaction (*)</li>
<li>Harvest</li>
</ul>
<p>(*) optional implementations</p>
</div>
<div class="slide" id="ogc-ws-csw-getrecords-operation">
<h1>OGC WS: CSW GetRecords operation</h1>
<p>main parameters: outputFormat (XML, text, html), maxRecords, SortBy, Constraint</p>
<p>GetRecords operation (output is XML)</p>
<div class="highlight"><pre>http://www.someserver.com/csw/csw.cgi?request=GetRecords<span class="err">&</span>version=2.0.2<span class="err">&</span>outputFormat=application/xml<span class="err">&</span>outputSchema=http://www.opengis.net/cat/csw/2.0.2<span class="err">&</span>namespace=csw:http://www.opengis.org/cat/csw<span class="err">&</span>ResponseHandler="mailto:info@site.com<span class="err">&</span>typeName=csw:Record<span class="err">&</span>elementSetName=brief<span class="err">&</span>constraintlanguage=CQLTEXT<span class="err">&</span>constraint="csw:AnyText Like '%pollution%'"
</pre></div>
</div>
<div class="slide" id="ogc-ws-wps">
<h1>OGC WS: WPS</h1>
<div class="sidebar">
<p class="first sidebar-title">Libs</p>
<blockquote>
<ul class="simple">
<li>pyWPS</li>
</ul>
</blockquote>
<p class="last">Web Processing Server provides rules for standardizing how inputs and outputs (requests and responses) for geospatial processing services</p>
</div>
<p>Operations:</p>
<ul class="incremental simple">
<li><em>GetCapabilities</em> returns service-level metadata</li>
<li><em>DescribeProcess</em> returns a description of a process including its inputs and outputs</li>
<li><em>Execute</em> returns the output(s) of a process</li>
</ul>
<p>Accepts parameters as GET, POST, SOAP</p>
</div>
<div class="slide" id="building-blocks-ws-geonames">
<h1>Building blocks - WS: GeoNames</h1>
<ul class="simple">
<li>a geographical database that covers all countries and contains over eight million placenames</li>
<li>license: Creative Commons Attribution 3.0</li>
<li>both a web application and a big set of web services</li>
</ul>
</div>
<div class="slide" id="geonames-web-services">
<h1>GeoNames: Web Services</h1>
<div class="sidebar">
<p class="first sidebar-title">GeoNames</p>
<ul class="last simple">
<li>License: CC</li>
<li>REST, XML and JSON WSs</li>
<li><em>Premium</em> offer</li>
</ul>
</div>
<p>Most notably:</p>
<ul class="incremental simple">
<li>geocoding</li>
<li>reverse geocoding</li>
<li>place hierarchy</li>
<li>places from bounding box</li>
<li>wikipedia search</li>
<li>postal code search</li>
<li>elevation</li>
</ul>
</div>
<div class="slide" id="geonames-example-of-api-use">
<h1>GeoNames: example of API use</h1>
<p>Regions of Italy:</p>
<p><a class="reference external" href="http://ws.geonames.org/children?geonameId=3175395">http://ws.geonames.org/children?geonameId=3175395</a></p>
<p>Response:</p>
<div class="highlight"><pre><span class="nt"><geonames</span> <span class="na">style=</span><span class="s">"MEDIUM"</span><span class="nt">></span>
<span class="nt"><totalResultsCount></span>20<span class="nt"></totalResultsCount></span>
<span class="nt"><geoname></span>
<span class="nt"><toponymName></span>Abruzzo<span class="nt"></toponymName></span>
<span class="nt"><name></span>Abruzzo<span class="nt"></name></span>
<span class="nt"><lat></span>42.25<span class="nt"></lat></span>
<span class="nt"><lng></span>13.75<span class="nt"></lng></span>
...
</pre></div>
</div>
<div class="slide" id="building-blocks-ws-google-maps">
<h1>Building blocks - WS: Google Maps</h1>
<div class="sidebar">
<p class="first sidebar-title">License example</p>
<p class="last">[...] the Elevation API may only be used in conjunction with displaying results on a Google map; using elevation data without displaying a map for which elevation data was requested is prohibited.</p>
</div>
<ul>
<li><p class="first">google map embedding (javascript API)</p>
</li>
<li><dl class="first docutils">
<dt>google map webservices</dt>
<dd><ul class="first last simple">
<li>geocoding (and reverse geocoding)</li>
<li>directions</li>
<li>elevations</li>
<li>places</li>
</ul>
</dd>
</dl>
</li>
</ul>
</div>
<div class="slide" id="google-maps-example-of-api-use">
<h1>Google Maps: example of API use</h1>
<p>A geocoding request example:</p>
<p><a class="reference external" href="http://maps.googleapis.com/maps/api/geocode/xml?address=123+via+Oberdan+Foligno,+Italy&sensor=true">http://maps.googleapis.com/maps/api/geocode/xml?address=123+via+Oberdan+Foligno,+Italy&sensor=true</a></p>
<p>Response:</p>
<div class="highlight"><pre><span class="nt"><GeocodeResponse></span>
<span class="nt"><status></span>OK<span class="nt"></status></span>
<span class="nt"><result></span>
<span class="nt"><type></span>street_address<span class="nt"></type></span>
<span class="nt"><formatted_address></span>
Via Guglielmo Oberdan, 123, 06034 Foligno Perugia, Italy
<span class="nt"></formatted_address></span>
...
<span class="nt"><geometry></span>
<span class="nt"><location></span>
<span class="nt"><lat></span>42.9561745<span class="nt"></lat></span>
<span class="nt"><lng></span>12.7090235<span class="nt"></lng></span>
<span class="nt"></location></span>
...
</pre></div>
</div>
<div class="slide" id="libraries-tools">
<h1>Libraries & Tools</h1>
<blockquote>
Libraries & Tools for the <strong>pythonic geographer</strong></blockquote>
<ul class="simple">
<li>QGIS</li>
<li>GeoPy</li>
<li>OWSLib</li>
<li>MapNik</li>
<li>MapScript</li>
<li>PyWPS</li>
<li>GRASS</li>
</ul>
</div>
<div class="slide" id="building-blocks-qgis">
<h1>Building blocks: QGIS</h1>
<img alt="images/qgis_logo.png" class="align-right" src="images/qgis_logo.png" style="width: 156.8px; height: 167.6px;" />
<p>QGIS (Quantum GIS) is a <em>C++ Qt</em> cross-platform GIS desktop application with vector editing
capabilities and python scripting support.</p>
<ul class="incremental simple">
<li>python plugins (lot of)</li>
<li><em>standalone</em> python applications (headless or GUI)</li>
<li>OGC WMS headless server</li>
</ul>
</div>
<div class="slide" id="qgis-standalone-headless">
<h1>QGIS: standalone headless</h1>
<blockquote>
Loading a vector layer</blockquote>
<div class="highlight"><pre><span class="o">>>></span> <span class="c"># Application init</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">qgis</span> <span class="kn">import</span> <span class="n">core</span>
<span class="o">>>></span> <span class="n">core</span><span class="o">.</span><span class="n">QgsApplication</span><span class="o">.</span><span class="n">setPrefixPath</span><span class="p">(</span><span class="s">"/usr"</span><span class="p">,</span> <span class="bp">True</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">core</span><span class="o">.</span><span class="n">QgsApplication</span><span class="o">.</span><span class="n">initQgis</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">vlayer</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">QgsVectorLayer</span><span class="p">(</span><span class="s">"regioni.shp"</span><span class="p">,</span> <span class="s">"regioni"</span><span class="p">,</span> <span class="s">"ogr"</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">vlayer</span><span class="o">.</span><span class="n">isValid</span><span class="p">()</span>
<span class="bp">True</span>
<span class="o">>>></span> <span class="c"># Add layer to registry</span>
<span class="o">>>></span> <span class="n">core</span><span class="o">.</span><span class="n">QgsMapLayerRegistry</span><span class="o">.</span><span class="n">instance</span><span class="p">()</span><span class="o">.</span><span class="n">addMapLayer</span><span class="p">(</span><span class="n">vlayer</span><span class="p">)</span>
<span class="o"><</span><span class="n">qgis</span><span class="o">.</span><span class="n">core</span><span class="o">.</span><span class="n">QgsVectorLayer</span> <span class="nb">object</span> <span class="n">at</span> <span class="mh">0x13be270</span><span class="o">></span>
<span class="o">>>></span> <span class="c"># Continue ...</span>
</pre></div>
</div>
<div class="slide" id="qgis-standalone-render">
<h1>QGIS: standalone (render)</h1>
<blockquote>
Rendering and image through <em>QGIS</em> API</blockquote>
<div class="highlight"><pre><span class="o">>>></span> <span class="c"># ... from previous example</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">PyQt4</span> <span class="kn">import</span> <span class="n">QtGui</span><span class="p">,</span> <span class="n">QtCore</span>
<span class="o">>>></span> <span class="n">img</span> <span class="o">=</span> <span class="n">QtGui</span><span class="o">.</span><span class="n">QImage</span><span class="p">(</span><span class="n">QtCore</span><span class="o">.</span><span class="n">QSize</span><span class="p">(</span><span class="mi">800</span><span class="p">,</span><span class="mi">600</span><span class="p">),</span> <span class="n">QtGui</span><span class="o">.</span><span class="n">QImage</span><span class="o">.</span><span class="n">Format_ARGB32_Premultiplied</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">p</span> <span class="o">=</span> <span class="n">QtGui</span><span class="o">.</span><span class="n">QPainter</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">begin</span><span class="p">(</span><span class="n">img</span><span class="p">)</span>
<span class="bp">True</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">setRenderHint</span><span class="p">(</span><span class="n">QtGui</span><span class="o">.</span><span class="n">QPainter</span><span class="o">.</span><span class="n">Antialiasing</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">render</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">QgsMapRenderer</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">lst</span> <span class="o">=</span> <span class="p">[</span> <span class="n">vlayer</span><span class="o">.</span><span class="n">getLayerID</span><span class="p">()</span> <span class="p">]</span>
<span class="o">>>></span> <span class="n">render</span><span class="o">.</span><span class="n">setLayerSet</span><span class="p">(</span><span class="n">lst</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">rect</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">QgsRectangle</span><span class="p">(</span><span class="n">render</span><span class="o">.</span><span class="n">fullExtent</span><span class="p">())</span>
<span class="o">>>></span> <span class="n">rect</span><span class="o">.</span><span class="n">scale</span><span class="p">(</span><span class="mf">1.1</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">render</span><span class="o">.</span><span class="n">setExtent</span><span class="p">(</span><span class="n">rect</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">render</span><span class="o">.</span><span class="n">setOutputSize</span><span class="p">(</span><span class="n">img</span><span class="o">.</span><span class="n">size</span><span class="p">(),</span> <span class="n">img</span><span class="o">.</span><span class="n">logicalDpiX</span><span class="p">())</span>
<span class="o">>>></span> <span class="n">img</span><span class="o">.</span><span class="n">size</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">isActive</span><span class="p">()</span>
<span class="bp">True</span>
<span class="o">>>></span> <span class="n">render</span><span class="o">.</span><span class="n">render</span><span class="p">(</span><span class="n">p</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">p</span><span class="o">.</span><span class="n">end</span><span class="p">()</span>
<span class="bp">True</span>
<span class="o">>>></span> <span class="n">img</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="n">wd</span> <span class="o">+</span> <span class="s">"/../images/regioni_qgis.png"</span><span class="p">,</span><span class="s">"png"</span><span class="p">)</span>
<span class="bp">True</span>
</pre></div>
</div>
<div class="slide" id="qgis-result">
<h1>QGIS: result</h1>
<img alt="images/regioni_qgis.png" src="images/regioni_qgis.png" style="width: 640.0px; height: 480.0px;" />
</div>
<div class="slide" id="qgis-standalone-gui">
<h1>QGIS: standalone GUI</h1>
<div class="sidebar">
<p class="first sidebar-title">Requires</p>
<ul class="last simple">
<li><em>pyQt4</em></li>
<li><em>QtDesigner</em> (recommended)</li>
<li>GUI programming skills</li>
</ul>
</div>
<img alt="images/qgis_qui_programming.png" src="images/qgis_qui_programming.png" />
<img alt="images/qt-designer.png" src="images/qt-designer.png" />
</div>
<div class="slide" id="qgis-standalone-gui-less-is-more">
<h1>QGIS standalone GUI less is more</h1>
<blockquote>
Minimal example: shapefile viewer</blockquote>
<div class="highlight"><pre><span class="o">>>></span> <span class="kn">from</span> <span class="nn">PyQt4</span> <span class="kn">import</span> <span class="n">QtGui</span><span class="p">,</span> <span class="n">QtCore</span>
<span class="o">>>></span> <span class="kn">import</span> <span class="nn">sys</span><span class="o">,</span> <span class="nn">os</span>
<span class="o">>>></span> <span class="kn">from</span> <span class="nn">qgis</span> <span class="kn">import</span> <span class="n">core</span><span class="p">,</span> <span class="n">gui</span>
<span class="o">>>></span> <span class="c"># QGIS application init</span>
<span class="o">>>></span> <span class="n">core</span><span class="o">.</span><span class="n">QgsApplication</span><span class="o">.</span><span class="n">setPrefixPath</span><span class="p">(</span><span class="s">'/usr'</span><span class="p">,</span> <span class="bp">True</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">core</span><span class="o">.</span><span class="n">QgsApplication</span><span class="o">.</span><span class="n">initQgis</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">app</span> <span class="o">=</span> <span class="n">QtGui</span><span class="o">.</span><span class="n">QApplication</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">)</span>
<span class="o">>>></span> <span class="c"># Layer loading and canvas init</span>
<span class="o">>>></span> <span class="n">l</span> <span class="o">=</span> <span class="n">core</span><span class="o">.</span><span class="n">QgsVectorLayer</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">basename</span><span class="p">(</span><span class="n">sys</span><span class="o">.</span><span class="n">argv</span><span class="p">[</span><span class="mi">1</span><span class="p">]),</span> <span class="s">'ogr'</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">l</span><span class="o">.</span><span class="n">isValid</span><span class="p">()</span>
<span class="bp">True</span>
<span class="o">>>></span> <span class="n">canvas</span> <span class="o">=</span> <span class="n">gui</span><span class="o">.</span><span class="n">QgsMapCanvas</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">canvas</span><span class="o">.</span><span class="n">resize</span><span class="p">(</span><span class="mi">800</span><span class="p">,</span><span class="mi">600</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">core</span><span class="o">.</span><span class="n">QgsMapLayerRegistry</span><span class="o">.</span><span class="n">instance</span><span class="p">()</span><span class="o">.</span><span class="n">addMapLayer</span><span class="p">(</span><span class="n">l</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">canvas</span><span class="o">.</span><span class="n">setExtent</span><span class="p">(</span><span class="n">l</span><span class="o">.</span><span class="n">extent</span><span class="p">())</span>
<span class="o">>>></span> <span class="n">cl</span> <span class="o">=</span> <span class="n">gui</span><span class="o">.</span><span class="n">QgsMapCanvasLayer</span><span class="p">(</span><span class="n">l</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">canvas</span><span class="o">.</span><span class="n">setLayerSet</span><span class="p">([</span> <span class="n">cl</span> <span class="p">])</span>
<span class="o">>>></span> <span class="n">canvas</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">retval</span> <span class="o">=</span> <span class="n">app</span><span class="o">.</span><span class="n">exec_</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">core</span><span class="o">.</span><span class="n">QgsApplication</span><span class="o">.</span><span class="n">exitQgis</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="n">retval</span><span class="p">)</span>
</pre></div>
</div>
<div class="slide" id="qgis-plugins">
<h1>QGIS: plugins</h1>
<blockquote>
Powerful extensions to QGIS! Download from <a class="reference external" href="http://pyqgis.org">http://pyqgis.org</a></blockquote>
<ul class="simple">
<li>start from a barebone plugin or use the <a class="reference external" href="http://www.dimitrisk.gr/qgis/creator/">Plugin builder</a></li>
<li>create a GUI with <em>QtDesigner</em></li>
<li>connect GUI events with QGIS code</li>
<li>control QGIS application from python code</li>
<li>see: QGIS APIs <a class="reference external" href="http://qgis.org/api/">http://qgis.org/api/</a></li>
</ul>
</div>
<div class="slide" id="geopy">
<h1>Geopy</h1>
<blockquote>
Geopy (<a class="reference external" href="http://code.google.com/p/geopy/">http://code.google.com/p/geopy/</a>) provides an interface to external <strong>geocoding</strong> and <strong>reverse geocoding</strong> <em>webservices</em></blockquote>
<p>Providers:</p>
<ul class="simple">
<li>Google Maps</li>
<li>Yahoo! Maps</li>
<li>Windows Local Live (Virtual Earth)</li>
<li>geocoder.us</li>
<li>GeoNames</li>
<li>MediaWiki pages (with the GIS extension)</li>
<li>Semantic MediaWiki pages</li>
</ul>
</div>
<div class="slide" id="geopy-installation-and-usage">
<h1>Geopy: installation and usage</h1>
<div class="highlight"><pre><span class="nv">$ </span>sudo easy_install geopy
</pre></div>
<div class="highlight"><pre><span class="o">>>></span> <span class="kn">from</span> <span class="nn">geopy</span> <span class="kn">import</span> <span class="n">geocoders</span>
<span class="o">>>></span> <span class="n">g</span> <span class="o">=</span> <span class="n">geocoders</span><span class="o">.</span><span class="n">Google</span><span class="p">()</span>
<span class="o">>>></span> <span class="n">g</span><span class="o">.</span><span class="n">geocode</span><span class="p">(</span><span class="s">'via anelli 12, milano'</span><span class="p">)</span>
<span class="p">(</span><span class="s">u'Via Luigi Anelli, 12, 20122 Milan, Italy'</span><span class="p">,</span> <span class="p">(</span><span class="mf">45.452325000000002</span><span class="p">,</span> <span class="mf">9.1927447999999998</span><span class="p">))</span>
<span class="o">>>></span> <span class="n">g</span><span class="o">.</span><span class="n">geocode</span><span class="p">(</span><span class="s">'otherworld'</span><span class="p">)</span>
<span class="n">GQueryError</span><span class="p">:</span> <span class="n">No</span> <span class="n">corresponding</span> <span class="n">geographic</span> <span class="n">location</span> <span class="n">could</span> <span class="n">be</span> <span class="n">found</span> <span class="k">for</span> <span class="n">the</span> <span class="n">specified</span> <span class="n">location</span><span class="p">,</span> <span class="n">possibly</span> <span class="n">because</span> <span class="n">the</span> <span class="n">address</span> <span class="ow">is</span> <span class="n">relatively</span> <span class="n">new</span><span class="p">,</span> <span class="ow">or</span> <span class="n">because</span> <span class="n">it</span> <span class="n">may</span> <span class="n">be</span> <span class="n">incorrect</span><span class="o">.</span>
</pre></div>
</div>
<div class="slide" id="geopy-risultati-multipli">
<h1>Geopy: risultati multipli</h1>
<div class="highlight"><pre><span class="o">>>></span> <span class="n">g</span><span class="o">.</span><span class="n">geocode</span><span class="p">(</span><span class="s">'xyz'</span><span class="p">)</span>
<span class="ne">ValueError</span><span class="p">:</span> <span class="n">Didn</span><span class="s">'t find exactly one placemark! (Found 6.)</span>
<span class="o">>>></span> <span class="k">for</span> <span class="n">l</span> <span class="ow">in</span> <span class="n">g</span><span class="o">.</span><span class="n">geocode</span><span class="p">(</span><span class="s">'xyz'</span><span class="p">,</span> <span class="n">exactly_one</span><span class="o">=</span><span class="bp">False</span><span class="p">):</span>
<span class="o">...</span> <span class="n">l</span>
<span class="o">...</span>
<span class="p">(</span><span class="s">u'S Xyz Rd, Pickford, MI 49774, USA'</span><span class="p">,</span> <span class="p">(</span><span class="mf">46.118099999999998</span><span class="p">,</span> <span class="o">-</span><span class="mf">84.321274599999995</span><span class="p">))</span>
<span class="p">(</span><span class="s">u'XYZ Liquor, 295 US Highway 17 S, Bartow, FL 33830, USA'</span><span class="p">,</span> <span class="p">(</span><span class="mf">27.895257999999998</span><span class="p">,</span> <span class="o">-</span><span class="mf">81.828790999999995</span><span class="p">))</span>
<span class="p">(</span><span class="s">u'XYZ Restaurant, 80 Seawall Rd, Southwest Harbor, ME 04679-4024, USA'</span><span class="p">,</span> <span class="p">(</span><span class="mf">44.269646999999999</span><span class="p">,</span> <span class="o">-</span><span class="mf">68.322371000000004</span><span class="p">))</span>
<span class="p">(</span><span class="s">u'XYZ Trading, 7018 Harwin Dr, Houston, TX 77036-2114, USA'</span><span class="p">,</span> <span class="p">(</span><span class="mf">29.718654999999998</span><span class="p">,</span> <span class="o">-</span><span class="mf">95.507260000000002</span><span class="p">))</span>
<span class="p">(</span><span class="s">u'Xyz Exterminating, PO Box 1643, Grand Island, NE 68802-1643, USA'</span><span class="p">,</span> <span class="p">(</span><span class="mf">40.93</span><span class="p">,</span> <span class="o">-</span><span class="mf">98.340000000000003</span><span class="p">))</span>
<span class="p">(</span><span class="s">u'</span><span class="se">\uff38\uff39\uff3a\u6c34\u6ca2</span><span class="s">'</span><span class="p">,</span> <span class="p">(</span><span class="mf">39.156194399999997</span><span class="p">,</span> <span class="mf">141.1596222</span><span class="p">))</span>
</pre></div>
</div>
<div class="slide" id="geopy-reverse">
<h1>Geopy: reverse</h1>
<blockquote>
<strong>svn</strong> version required for reverse functions</blockquote>
<div class="highlight"><pre><span class="nv">$ </span>svn checkout http://geopy.googlecode.com/svn/branches/reverse-geocode geopy
<span class="nv">$ </span><span class="nb">cd </span>geopy/
<span class="nv">$ </span>sudo python setup.py install
</pre></div>
<div class="highlight"><pre><span class="o">>>></span> <span class="p">(</span><span class="n">loc</span><span class="p">,</span> <span class="n">point</span><span class="p">)</span> <span class="o">=</span> <span class="n">g</span><span class="o">.</span><span class="n">geocode</span><span class="p">(</span><span class="s">'via anelli 1, milano'</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">point</span>
<span class="p">(</span><span class="mf">45.453902599999999</span><span class="p">,</span> <span class="mf">9.1930519000000004</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">g</span><span class="o">.</span><span class="n">reverse</span><span class="p">(</span><span class="n">point</span><span class="p">)</span>
<span class="p">(</span><span class="s">u'Via Luigi Anelli, 1, 20122 Milan, Italy'</span><span class="p">,</span>
<span class="p">(</span><span class="mf">45.453902599999999</span><span class="p">,</span> <span class="mf">9.1930519000000004</span><span class="p">))</span>
</pre></div>
</div>
<div class="slide" id="owslib">
<h1>OWSLib</h1>
<blockquote>
OWSLib Makes WxS Suck Less.
A library to consume OGC(TM) web services.</blockquote>
<div class="sidebar">
<p class="first sidebar-title">Depends on</p>
<ul class="last simple">
<li>lxml</li>
</ul>
</div>
<table border="1" class="docutils">
<colgroup>
<col width="31%" />
<col width="69%" />
</colgroup>
<thead valign="bottom">
<tr><th class="head">Standard</th>
<th class="head">Version(s)</th>
</tr>
</thead>
<tbody valign="top">
<tr><td>OGC WMS</td>
<td>1.1.1</td>
</tr>
<tr><td>OGC WFS</td>
<td>1.0.0, 1.1.0</td>
</tr>
<tr><td>OGC WCS</td>
<td>1.0.0, 1.1.0</td>
</tr>
<tr><td>OGC WMC</td>
<td>1.1.0</td>
</tr>
<tr><td>OGC SOS</td>
<td>1.0.0 (not complete)</td>
</tr>
<tr><td>OGC CSW</td>
<td>2.0.2</td>
</tr>
<tr><td>OGC Filter</td>
<td>1.1.0</td>
</tr>
<tr><td>OGC OWS Common</td>
<td>1.0.0, 1.1.0, 2.0</td>
</tr>
<tr><td>NASA DIF</td>
<td>9.7</td>
</tr>
<tr><td>FGDC CSDGM</td>
<td>1998</td>
</tr>
<tr><td>ISO 19139</td>
<td>2003/2007</td>
</tr>
<tr><td>Dublin Core</td>
<td>1.1</td>
</tr>
</tbody>
</table>
</div>
<div class="slide" id="owslib-installation-and-usage">
<h1>OWSLib: installation and usage</h1>
<div class="highlight"><pre><span class="nv">$ </span>sudo easy_install OWSLib
</pre></div>
<div class="highlight"><pre><span class="o">>>></span> <span class="kn">from</span> <span class="nn">owslib.wms</span> <span class="kn">import</span> <span class="n">WebMapService</span>
<span class="o">>>></span> <span class="n">wms</span> <span class="o">=</span> <span class="n">WebMapService</span><span class="p">(</span><span class="s">'http://wms.pcn.minambiente.it/cgi-bin/mapserv.exe?map=/ms_ogc/service/ortofoto_colore_06_f32.map'</span><span class="p">,</span> <span class="n">version</span><span class="o">=</span><span class="s">'1.1.1'</span><span class="p">)</span>
<span class="o">>>></span> <span class="nb">list</span><span class="p">(</span><span class="n">wms</span><span class="o">.</span><span class="n">contents</span><span class="p">)</span>
<span class="p">[</span><span class="s">'ortofoto_colore_06'</span><span class="p">,</span> <span class="s">'watermark'</span><span class="p">]</span>
<span class="o">>>></span> <span class="n">wms</span><span class="o">.</span><span class="n">contents</span><span class="p">[</span><span class="s">'ortofoto_colore_06'</span><span class="p">]</span>
<span class="o">>>></span> <span class="n">md</span><span class="o">.</span><span class="n">crsOptions</span>
<span class="n">Out</span><span class="p">[</span><span class="mi">7</span><span class="p">]:</span> <span class="p">[</span><span class="s">'EPSG:32632'</span><span class="p">]</span>
<span class="o">>>></span> <span class="n">wms</span><span class="p">[</span><span class="s">'ortofoto_colore_06'</span><span class="p">]</span><span class="o">.</span><span class="n">boundingBox</span>
<span class="p">(</span><span class="mf">298457.0</span><span class="p">,</span> <span class="mf">3914540.0</span><span class="p">,</span> <span class="mf">1327000.0</span><span class="p">,</span> <span class="mf">5239710.0</span><span class="p">,</span> <span class="s">'EPSG:32632'</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">wms</span><span class="p">[</span><span class="s">'ortofoto_colore_06'</span><span class="p">]</span><span class="o">.</span><span class="n">boundingBoxWGS84</span>
<span class="p">(</span><span class="mf">6.3349900000000003</span><span class="p">,</span>
<span class="mf">35.034300000000002</span><span class="p">,</span>
<span class="mf">19.840800000000002</span><span class="p">,</span>
<span class="mf">47.310899999999997</span><span class="p">)</span>
</pre></div>
</div>
<div class="slide" id="owslib-usage">
<h1>OWSLib: usage</h1>
<div class="highlight"><pre><span class="o">>>></span> <span class="n">wms</span><span class="o">.</span><span class="n">getOperationByName</span><span class="p">(</span><span class="s">'GetMap'</span><span class="p">)</span><span class="o">.</span><span class="n">formatOptions</span>
<span class="p">[</span><span class="s">'image/png'</span><span class="p">,</span>
<span class="s">'image/gif'</span><span class="p">,</span>
<span class="s">'image/png; mode=24bit'</span><span class="p">,</span>
<span class="s">'image/jpeg'</span><span class="p">,</span>
<span class="s">'image/wbmp'</span><span class="p">,</span>
<span class="s">'image/tiff'</span><span class="p">,</span>
<span class="s">'image/svg+xml'</span><span class="p">]</span>
<span class="o">>>></span> <span class="n">img</span> <span class="o">=</span> <span class="n">wms</span><span class="o">.</span><span class="n">getmap</span><span class="p">(</span> <span class="n">layers</span><span class="o">=</span> <span class="p">[</span><span class="s">'ortofoto_colore_06'</span><span class="p">],</span> <span class="n">bbox</span> <span class="o">=</span> <span class="p">(</span><span class="mi">514832</span><span class="p">,</span> <span class="mi">5034338</span><span class="p">,</span> <span class="mi">515032</span><span class="p">,</span> <span class="mi">5034548</span><span class="p">),</span> <span class="n">srs</span> <span class="o">=</span> <span class="s">'EPSG:32632'</span><span class="p">,</span> <span class="n">size</span><span class="o">=</span><span class="p">(</span><span class="mi">300</span><span class="p">,</span> <span class="mi">300</span><span class="p">),</span> <span class="n">format</span> <span class="o">=</span> <span class="s">'image/jpeg'</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">img</span><span class="o">.</span><span class="n">geturl</span><span class="p">()</span>
<span class="s">'http://wms.pcn.minambiente.it/cgi-bin/mapserv.exe?map= ...'</span>
<span class="o">>>></span> <span class="n">outfile</span> <span class="o">=</span> <span class="nb">open</span><span class="p">(</span><span class="s">'duomo.jpg'</span><span class="p">,</span> <span class="s">'wb'</span><span class="p">)</span>
<span class="o">>>></span> <span class="n">outfile</span><span class="o">.</span><span class="n">write</span><span class="p">(</span><span class="n">img</span><span class="o">.</span><span class="n">read</span><span class="p">())</span>
<span class="o">>>></span> <span class="n">outfile</span><span class="o">.</span><span class="n">close</span><span class="p">()</span>
</pre></div>
</div>
<div class="slide" id="owslib-result">
<h1>OWSLib: result</h1>
<blockquote>
<img alt="images/duomo.jpg" src="images/duomo.jpg" />
</blockquote>
</div>
<div class="slide" id="mapnik">
<h1>Mapnik</h1>
<blockquote>
Mapnik is a <em>C++</em> Toolkit for developing mapping applications.
Above all Mapnik is about making beautiful maps. Suitable for both server and desktop.</blockquote>
<img alt="images/mapnik-logo.png" class="align-right" src="images/mapnik-logo.png" />
<div class="sidebar">
<p class="first sidebar-title">Pros & Cons</p>
<ul class="last simple">
<li>Nice <em>utils</em> programs</li>
<li>Rendering engine for OSM</li>
<li>Itegrated WMS server</li>
<li>Lack of documentation</li>
<li>XML configuration for styles</li>
<li>No SLD support</li>
<li>QuantumNik QGIS plugin</li>
</ul>
</div>
<p>Installation</p>
<div class="highlight"><pre><span class="nv">$ </span>sudo apt-get install libmapnik0.7 mapnik-utils python-mapnik
</pre></div>
<p>Installation from source is a nightmare: lot of dependencies</p>
</div>
<div class="slide" id="mapnik-python-map">
<h1>Mapnik: python map</h1>
<div class="highlight"><pre><span class="kn">import</span> <span class="nn">mapnik</span>
<span class="n">m</span> <span class="o">=</span> <span class="n">mapnik</span><span class="o">.</span><span class="n">Map</span><span class="p">(</span><span class="mi">300</span><span class="p">,</span><span class="mi">300</span><span class="p">,</span><span class="s">"+proj=latlong +datum=WGS84"</span><span class="p">)</span>
<span class="n">m</span><span class="o">.</span><span class="n">background</span> <span class="o">=</span> <span class="n">mapnik</span><span class="o">.</span><span class="n">Color</span><span class="p">(</span><span class="s">'steelblue'</span><span class="p">)</span>
<span class="n">s</span> <span class="o">=</span> <span class="n">mapnik</span><span class="o">.</span><span class="n">Style</span><span class="p">()</span>
<span class="n">r</span> <span class="o">=</span> <span class="n">mapnik</span><span class="o">.</span><span class="n">Rule</span><span class="p">()</span>
<span class="n">r</span><span class="o">.</span><span class="n">symbols</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">mapnik</span><span class="o">.</span><span class="n">PolygonSymbolizer</span><span class="p">(</span><span class="n">mapnik</span><span class="o">.</span><span class="n">Color</span><span class="p">(</span><span class="s">'#f2eff9'</span><span class="p">)))</span>
<span class="n">r</span><span class="o">.</span><span class="n">symbols</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">mapnik</span><span class="o">.</span><span class="n">LineSymbolizer</span><span class="p">(</span><span class="n">mapnik</span><span class="o">.</span><span class="n">Color</span><span class="p">(</span><span class="s">'rgb(50%,50%,50%)'</span><span class="p">),</span><span class="mf">0.1</span><span class="p">))</span>
<span class="n">s</span><span class="o">.</span><span class="n">rules</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">r</span><span class="p">)</span>
<span class="c"># Make PIEDMONT red</span>
<span class="n">r</span> <span class="o">=</span> <span class="n">mapnik</span><span class="o">.</span><span class="n">Rule</span><span class="p">()</span>
<span class="n">r</span><span class="o">.</span><span class="n">filter</span> <span class="o">=</span> <span class="n">mapnik</span><span class="o">.</span><span class="n">Filter</span><span class="p">(</span><span class="s">"[regione] = 'PIEMONTE'"</span><span class="p">)</span>
<span class="n">r</span><span class="o">.</span><span class="n">symbols</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">mapnik</span><span class="o">.</span><span class="n">PolygonSymbolizer</span><span class="p">(</span><span class="n">mapnik</span><span class="o">.</span><span class="n">Color</span><span class="p">(</span><span class="s">'#ff0000'</span><span class="p">)))</span>
<span class="n">s</span><span class="o">.</span><span class="n">rules</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">r</span><span class="p">)</span>
<span class="n">m</span><span class="o">.</span><span class="n">append_style</span><span class="p">(</span><span class="s">'My Style'</span><span class="p">,</span><span class="n">s</span><span class="p">)</span>
<span class="n">lyr</span> <span class="o">=</span> <span class="n">mapnik</span><span class="o">.</span><span class="n">Layer</span><span class="p">(</span><span class="s">'world'</span><span class="p">,</span><span class="s">"+proj=latlong +datum=WGS84"</span><span class="p">)</span>
<span class="n">lyr</span><span class="o">.</span><span class="n">datasource</span> <span class="o">=</span> <span class="n">mapnik</span><span class="o">.</span><span class="n">Shapefile</span><span class="p">(</span><span class="nb">file</span> <span class="o">=</span> <span class="s">'../data/regioni'</span><span class="p">)</span>
<span class="n">lyr</span><span class="o">.</span><span class="n">styles</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="s">'My Style'</span><span class="p">)</span>
<span class="n">m</span><span class="o">.</span><span class="n">layers</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">lyr</span><span class="p">)</span>
<span class="n">m</span><span class="o">.</span><span class="n">zoom_to_box</span><span class="p">(</span><span class="n">lyr</span><span class="o">.</span><span class="n">envelope</span><span class="p">())</span>
<span class="n">mapnik</span><span class="o">.</span><span class="n">render_to_file</span><span class="p">(</span><span class="n">m</span><span class="p">,</span> <span class="s">'../images/regioni_mapnik.png'</span><span class="p">,</span> <span class="s">'png256'</span><span class="p">)</span>
</pre></div>
</div>
<div class="slide" id="mapnik-layer-inspection">
<h1>Mapnik: layer inspection</h1>
<blockquote>
Can be useful for dynamic rules building</blockquote>
<div class="highlight"><pre><span class="c"># .. continues from previous example</span>
<span class="o">>>></span> <span class="n">feature</span> <span class="o">=</span> <span class="n">lyr</span><span class="o">.</span><span class="n">datasource</span><span class="o">.</span><span class="n">all_features</span><span class="p">()[</span><span class="mi">0</span><span class="p">]</span>
<span class="o">>>></span> <span class="k">for</span> <span class="n">p</span> <span class="ow">in</span> <span class="n">feature</span><span class="o">.</span><span class="n">attributes</span><span class="p">:</span>
<span class="o">...</span> <span class="n">p</span>
<span class="p">(</span><span class="s">'boundingbo'</span><span class="p">,</span> <span class="s">u''</span><span class="p">)</span>
<span class="p">(</span><span class="s">'cod_reg'</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="p">(</span><span class="s">'cod_rip1'</span><span class="p">,</span> <span class="mi">11</span><span class="p">)</span>
<span class="p">(</span><span class="s">'cod_rip2'</span><span class="p">,</span> <span class="mi">21</span><span class="p">)</span>
<span class="p">(</span><span class="s">'gid'</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="p">(</span><span class="s">'objectid'</span><span class="p">,</span> <span class="mi">1</span><span class="p">)</span>
<span class="p">(</span><span class="s">'regione'</span><span class="p">,</span> <span class="s">u'PIEMONTE'</span><span class="p">)</span>
<span class="p">(</span><span class="s">'shape_area'</span><span class="p">,</span> <span class="mf">25388746287.599998</span><span class="p">)</span>
<span class="p">(</span><span class="s">'shape_len'</span><span class="p">,</span> <span class="mf">1334295.0100499999</span><span class="p">)</span>
</pre></div>
</div>
<div class="slide" id="mapnik-xml-mapfile">
<h1>Mapnik: XML mapfile</h1>
<div class="highlight"><pre><span class="cp"><?xml version="1.0" encoding="utf-8"?></span>
<span class="cp"><!DOCTYPE Map></span>
<span class="nt"><Map</span> <span class="na">bgcolor=</span><span class="s">"steelblue"</span> <span class="na">srs=</span><span class="s">"+proj=latlong +datum=WGS84"</span><span class="nt">></span>
<span class="nt"><Style</span> <span class="na">name=</span><span class="s">"My Style"</span><span class="nt">></span>
<span class="nt"><Rule></span>
<span class="nt"><PolygonSymbolizer></span>
<span class="nt"><CssParameter</span> <span class="na">name=</span><span class="s">"fill"</span><span class="nt">></span>#f2eff9<span class="nt"></CssParameter></span>
<span class="nt"></PolygonSymbolizer></span>
<span class="nt"><LineSymbolizer></span>
<span class="nt"><CssParameter</span> <span class="na">name=</span><span class="s">"stroke"</span><span class="nt">></span>rgb(50%,50%,50%)<span class="nt"></CssParameter></span>
<span class="nt"><CssParameter</span> <span class="na">name=</span><span class="s">"stroke-width"</span><span class="nt">></span>0.1<span class="nt"></CssParameter></span>
<span class="nt"></LineSymbolizer></span>
<span class="nt"></Rule></span>
<span class="nt"><Rule></span>
<span class="nt"><Filter></span>[regione] = 'PIEMONTE'<span class="nt"></Filter></span>
<span class="nt"><PolygonSymbolizer></span>
<span class="nt"><CssParameter</span> <span class="na">name=</span><span class="s">"fill"</span><span class="nt">></span>#ff0000<span class="nt"></CssParameter></span>
<span class="nt"></PolygonSymbolizer></span>
<span class="nt"></Rule></span>
<span class="nt"></Style></span>
<span class="nt"><Layer</span> <span class="na">name=</span><span class="s">"regioni"</span> <span class="na">srs=</span><span class="s">"+proj=latlong +datum=WGS84"</span><span class="nt">></span>
<span class="nt"><StyleName></span>My Style<span class="nt"></StyleName></span>
<span class="nt"><Datasource></span>
<span class="nt"><Parameter</span> <span class="na">name=</span><span class="s">"type"</span><span class="nt">></span>shape<span class="nt"></Parameter></span>
<span class="nt"><Parameter</span> <span class="na">name=</span><span class="s">"file"</span><span class="nt">></span>../data/regioni<span class="nt"></Parameter></span>
<span class="nt"></Datasource></span>
<span class="nt"></Layer></span>
<span class="nt"></Map></span>
</pre></div>
</div>
<div class="slide" id="mapnik-result">
<h1>Mapnik: result</h1>
<img alt="images/regioni_mapnik.png" src="images/regioni_mapnik.png" />
</div>
<div class="slide" id="mapscript">
<h1>Mapscript</h1>
<blockquote>
Python bindings to <strong>UMN MapServer</strong> (<em>C</em>)</blockquote>
<ul class="simple">
<li>complete bindings: full access to MapServer power</li>
<li>not very <em>pythonic</em></li>
<li><a class="reference external" href="http://mapserver.org/mapscript/">http://mapserver.org/mapscript/</a></li>
</ul>
<p>Installation:</p>
<div class="highlight"><pre><span class="nv">$ </span>sudo apt-get install python-mapscript
</pre></div>
</div>
<div class="slide" id="mapscript-usage">
<h1>Mapscript: usage</h1>
<div class="sidebar">
<p class="first sidebar-title">Hate</p>
<p class="last">I hate mapfiles ;)</p>
</div>
<div class="highlight"><pre><span class="kn">import</span> <span class="nn">mapscript</span>
<span class="nb">map</span> <span class="o">=</span> <span class="n">mapscript</span><span class="o">.</span><span class="n">mapObj</span><span class="p">(</span> <span class="p">)</span>
<span class="nb">map</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="s">'Test Map'</span>
<span class="nb">map</span><span class="o">.</span><span class="n">setSize</span><span class="p">(</span><span class="mi">300</span><span class="p">,</span> <span class="mi">300</span><span class="p">)</span>
<span class="nb">map</span><span class="o">.</span><span class="n">setExtent</span><span class="p">(</span><span class="o">-</span><span class="mf">180.0</span><span class="p">,</span><span class="o">-</span><span class="mf">90.0</span><span class="p">,</span><span class="mf">180.0</span><span class="p">,</span><span class="mf">90.0</span><span class="p">)</span>
<span class="nb">map</span><span class="o">.</span><span class="n">imagecolor</span><span class="o">.</span><span class="n">setRGB</span><span class="p">(</span><span class="mi">80</span><span class="p">,</span> <span class="mi">180</span><span class="p">,</span> <span class="mi">80</span><span class="p">)</span>
<span class="nb">map</span><span class="o">.</span><span class="n">units</span> <span class="o">=</span> <span class="n">mapscript</span><span class="o">.</span><span class="n">MS_DD</span>
<span class="n">layer</span> <span class="o">=</span> <span class="n">mapscript</span><span class="o">.</span><span class="n">layerObj</span><span class="p">(</span><span class="nb">map</span><span class="p">)</span>
<span class="n">layer</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="s">"regioni"</span>
<span class="n">layer</span><span class="o">.</span><span class="n">type</span> <span class="o">=</span> <span class="n">mapscript</span><span class="o">.</span><span class="n">MS_LAYER_POLYGON</span>
<span class="n">layer</span><span class="o">.</span><span class="n">status</span> <span class="o">=</span> <span class="n">mapscript</span><span class="o">.</span><span class="n">MS_DEFAULT</span>
<span class="n">layer</span><span class="o">.</span><span class="n">data</span> <span class="o">=</span> <span class="s">'data/regioni'</span>
<span class="n">lass1</span> <span class="o">=</span> <span class="n">mapscript</span><span class="o">.</span><span class="n">classObj</span><span class="p">(</span><span class="n">layer</span><span class="p">)</span>
<span class="n">class1</span><span class="o">.</span><span class="n">name</span> <span class="o">=</span> <span class="s">"Regioni"</span>
<span class="n">style</span> <span class="o">=</span> <span class="n">mapscript</span><span class="o">.</span><span class="n">styleObj</span><span class="p">(</span><span class="n">class1</span><span class="p">)</span>
<span class="n">style</span><span class="o">.</span><span class="n">outlinecolor</span><span class="o">.</span><span class="n">setRGB</span><span class="p">(</span><span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">,</span> <span class="mi">100</span><span class="p">)</span>
<span class="n">style</span><span class="o">.</span><span class="n">color</span><span class="o">.</span><span class="n">setRGB</span><span class="p">(</span><span class="mi">200</span><span class="p">,</span> <span class="mi">200</span><span class="p">,</span> <span class="mi">200</span><span class="p">)</span>
<span class="n">extent</span> <span class="o">=</span> <span class="n">layer</span><span class="o">.</span><span class="n">getExtent</span><span class="p">()</span>
<span class="nb">map</span><span class="o">.</span><span class="n">setExtent</span><span class="p">(</span><span class="n">extent</span><span class="o">.</span><span class="n">minx</span><span class="p">,</span> <span class="n">extent</span><span class="o">.</span><span class="n">miny</span><span class="p">,</span> <span class="n">extent</span><span class="o">.</span><span class="n">maxx</span><span class="p">,</span> <span class="n">extent</span><span class="o">.</span><span class="n">maxy</span><span class="p">)</span>
<span class="n">mapimage</span> <span class="o">=</span> <span class="nb">map</span><span class="o">.</span><span class="n">draw</span><span class="p">()</span>
<span class="n">mapimage</span><span class="o">.</span><span class="n">save</span><span class="p">(</span><span class="s">'images/mapscript_map.png'</span><span class="p">)</span>
</pre></div>
</div>
<div class="slide" id="mapscript-result">
<h1>MapScript: result</h1>
<img alt="images/mapscript_map.png" src="images/mapscript_map.png" />
</div>
<div class="slide" id="pywps">
<h1>pyWPS</h1>
<blockquote>
(Python Web Processing Service) is an implementation of the <em>Web Processing Service</em> standard from Open Geospatial Consortium.
It offers an environment for programming own processes (geofunctions or models) which can be accessed from the public. The main advantage of PyWPS is, that it has been written with native support for <em>GRASS</em> GIS.</blockquote>
<ul class="simple">
<li><a class="reference external" href="http://pywps.wald.intevation.org/">http://pywps.wald.intevation.org/</a></li>
</ul>
<img alt="images/pywps-schema.png" src="images/pywps-schema.png" />
</div>
<div class="slide" id="grass">
<h1>GRASS</h1>
<blockquote>
Powerful <strong>raster</strong> GIS analysis (mixed: <em>C</em>, <em>Python</em> etc.)</blockquote>
<ul class="simple">
<li>GRASS Python scripting library</li>
<li>GRASS ctypes bindings (low level GRASS library calls)</li>
</ul>
<img alt="images/grasslogo_vector_small.png" class="align-right" src="images/grasslogo_vector_small.png" />
<ul class="simple">
<li>lot of environment requirements</li>
<li>difficult to configure for an headless use</li>
</ul>
</div>
<div class="slide" id="grass-scripting">
<h1>GRASS: scripting</h1>
<p>Environment setup</p>
<div class="highlight"><pre><span class="kn">import</span> <span class="nn">sys</span><span class="o">,</span> <span class="nn">os</span>
<span class="n">GISBASE</span> <span class="o">=</span> <span class="s">'/usr/lib/grass64/'</span>
<span class="n">wd</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">dirname</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">realpath</span><span class="p">(</span><span class="n">__file__</span><span class="p">))</span>
<span class="c"># Setup environment</span>
<span class="n">sys</span><span class="o">.</span><span class="n">path</span><span class="o">.</span><span class="n">append</span><span class="p">(</span> <span class="n">GISBASE</span> <span class="o">+</span> <span class="s">'etc/python/'</span> <span class="p">)</span>
<span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">'GISBASE'</span><span class="p">]</span> <span class="o">=</span> <span class="n">GISBASE</span>
<span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">'GISRC'</span><span class="p">]</span> <span class="o">=</span> <span class="s">'/home/'</span> <span class="o">+</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">'USER'</span><span class="p">]</span> <span class="o">+</span> <span class="s">'/.grassrc6'</span>
<span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">'PATH'</span><span class="p">]</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">'PATH'</span><span class="p">]</span> <span class="o">+</span> <span class="s">':'</span> <span class="o">+</span> <span class="n">GISBASE</span> <span class="o">+</span> <span class="s">'scripts/'</span>
<span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">'PATH'</span><span class="p">]</span> <span class="o">=</span> <span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">'PATH'</span><span class="p">]</span> <span class="o">+</span> <span class="s">':'</span> <span class="o">+</span> <span class="n">GISBASE</span> <span class="o">+</span> <span class="s">'bin/'</span>
<span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">'LD_LIBRARY_PATH'</span><span class="p">]</span> <span class="o">=</span> <span class="n">GISBASE</span> <span class="o">+</span> <span class="s">'lib/'</span>
<span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s">'GIS_LOCK'</span><span class="p">]</span> <span class="o">=</span> <span class="s">"</span><span class="si">%s</span><span class="s">"</span> <span class="o">%</span> <span class="n">os</span><span class="o">.</span><span class="n">getpid</span><span class="p">()</span>
<span class="kn">import</span> <span class="nn">grass.script</span> <span class="kn">as</span> <span class="nn">grass</span>
</pre></div>
</div>
<div class="slide" id="grass-scripting-2">
<h1>GRASS: scripting (2)</h1>
<p>Running commands</p>
<div class="highlight"><pre><span class="k">print</span> <span class="n">grass</span><span class="o">.</span><span class="n">run_command</span><span class="p">(</span><span class="s">'g.version'</span><span class="p">,</span> <span class="n">flags</span> <span class="o">=</span> <span class="s">'r'</span><span class="p">)</span>
<span class="k">print</span> <span class="n">grass</span><span class="o">.</span><span class="n">run_command</span><span class="p">(</span><span class="s">'v.in.ogr'</span><span class="p">,</span> <span class="n">flags</span> <span class="o">=</span> <span class="s">'l'</span><span class="p">,</span> <span class="n">dsn</span> <span class="o">=</span> <span class="n">wd</span> <span class="o">+</span> <span class="s">'/../data/regioni.shp'</span><span class="p">)</span>
<span class="k">print</span> <span class="n">grass</span><span class="o">.</span><span class="n">run_command</span><span class="p">(</span><span class="s">'v.in.ogr'</span><span class="p">,</span> <span class="n">flags</span><span class="o">=</span><span class="s">'c'</span><span class="p">,</span> <span class="n">layer</span> <span class="o">=</span> <span class="s">'regioni'</span><span class="p">,</span> <span class="n">location</span> <span class="o">=</span> <span class="s">'regioni'</span><span class="p">,</span> <span class="n">output</span> <span class="o">=</span> <span class="s">'regioni'</span><span class="p">,</span> <span class="n">dsn</span> <span class="o">=</span> <span class="n">wd</span> <span class="o">+</span> <span class="s">'/../data/regioni.shp'</span><span class="p">)</span>
<span class="c"># Set region resolution</span>
<span class="k">print</span> <span class="n">grass</span><span class="o">.</span><span class="n">run_command</span><span class="p">(</span><span class="s">'g.mapset'</span><span class="p">,</span> <span class="n">mapset</span><span class="o">=</span><span class="s">'PERMANENT'</span><span class="p">,</span> <span class="n">location</span><span class="o">=</span><span class="s">'regioni'</span><span class="p">)</span>
<span class="k">print</span> <span class="n">grass</span><span class="o">.</span><span class="n">run_command</span><span class="p">(</span><span class="s">'g.region'</span><span class="p">,</span> <span class="n">res</span> <span class="o">=</span> <span class="mf">0.02</span><span class="p">)</span>
<span class="k">print</span> <span class="n">grass</span><span class="o">.</span><span class="n">run_command</span><span class="p">(</span><span class="s">'g.list'</span><span class="p">,</span> <span class="nb">type</span> <span class="o">=</span> <span class="s">'vect'</span><span class="p">)</span>
<span class="k">print</span> <span class="n">grass</span><span class="o">.</span><span class="n">run_command</span><span class="p">(</span><span class="s">'v.to.rast'</span><span class="p">,</span> <span class="nb">input</span><span class="o">=</span><span class="s">'regioni'</span><span class="p">,</span> <span class="n">output</span><span class="o">=</span><span class="s">'regioni'</span><span class="p">,</span> <span class="n">column</span><span class="o">=</span><span class="s">'cod_reg'</span><span class="p">)</span>
<span class="k">print</span> <span class="n">grass</span><span class="o">.</span><span class="n">run_command</span><span class="p">(</span><span class="s">'r.out.png'</span><span class="p">,</span> <span class="nb">input</span><span class="o">=</span><span class="s">'regioni'</span><span class="p">,</span> <span class="n">output</span><span class="o">=</span> <span class="n">wd</span> <span class="o">+</span> <span class="s">'/../images/regioni_grass.png'</span><span class="p">)</span>
</pre></div>
</div>
<div class="slide" id="grass-result">
<h1>GRASS: result</h1>
<img alt="images/regioni_grass.png" src="images/regioni_grass.png" style="width: 297.5px; height: 290.0px;" />
</div>
<div class="slide" id="grass-ctypes">
<h1>GRASS: ctypes</h1>
<div class="highlight"><pre><span class="nv">$ </span><span class="nb">export </span><span class="nv">LD_LIBRARY_PATH</span><span class="o">=</span><span class="s1">'/usr/lib/grass64/lib/'</span>
</pre></div>
<p class="handout">Ctypes reads LD_LIBRARY_PATH at python interpreter startup: non way to set this from the script.</p>
<div class="highlight"><pre><span class="kn">from</span> <span class="nn">ctypes</span> <span class="kn">import</span> <span class="o">*</span>
<span class="n">cgrass</span> <span class="o">=</span> <span class="n">CDLL</span><span class="p">(</span><span class="s">"libgrass_gis.so"</span><span class="p">)</span>
<span class="n">cgrass</span><span class="o">.</span><span class="n">G__gisinit</span><span class="p">()</span>
</pre></div>
</div>
<div class="slide" id="links">
<h1>Links</h1>
<ul>
<li><dl class="first docutils">
<dt>QGIS</dt>
<dd><ul class="first last simple">
<li><a class="reference external" href="http://www.qgis.org/wiki/Python_Bindings">http://www.qgis.org/wiki/Python_Bindings</a></li>
<li><a class="reference external" href="http://www.qgis.org/pyqgis-cookbook/">http://www.qgis.org/pyqgis-cookbook/</a></li>
<li><a class="reference external" href="http://desktopgisbook.com/Creating_a_Standalone_GIS_Application_1">http://desktopgisbook.com/Creating_a_Standalone_GIS_Application_1</a></li>
<li><a class="reference external" href="http://www.dimitrisk.gr/qgis/creator/">http://www.dimitrisk.gr/qgis/creator/</a></li>
</ul>
</dd>
</dl>
</li>
<li><dl class="first docutils">
<dt>GRASS</dt>
<dd><ul class="first last simple">
<li><a class="reference external" href="http://grass.osgeo.org/programming6/pythonlib.html">http://grass.osgeo.org/programming6/pythonlib.html</a></li>
<li><a class="reference external" href="http://grass.osgeo.org/grass64/manuals/html64_user/index.html">http://grass.osgeo.org/grass64/manuals/html64_user/index.html</a></li>
</ul>
</dd>
</dl>
</li>
<li><dl class="first docutils">
<dt>Mapnik</dt>
<dd><ul class="first last simple">
<li><a class="reference external" href="http://mapnik.org">http://mapnik.org</a></li>
<li><a class="reference external" href="http://code.google.com/p/mapnik-utils/">http://code.google.com/p/mapnik-utils/</a></li>
<li><a class="reference external" href="http://bitbucket.org/springmeyer/quantumnik/">http://bitbucket.org/springmeyer/quantumnik/</a></li>
</ul>
</dd>
</dl>
</li>
<li><dl class="first docutils">
<dt>PyWPS</dt>
<dd><ul class="first last simple">
<li><a class="reference external" href="http://pywps.wald.intevation.org/">http://pywps.wald.intevation.org/</a></li>
</ul>
</dd>
</dl>
</li>
</ul>
</div>
</div>
</body>
</html>