Geemap legend and areas

[Jo316]

I recently came across to your blog, and I have been learning the package you developed “geemap”. I have a few questions:

1. Legend
   legends = geemap.builtin_legends
   for legend in legends:
   print(legend)

The code above only extract a custom legend. Is it possible to customize my how legend? It is possible to produce a spectral continuous value legend instead of categorical that you exemplified with landcover dataset?

2. Area flooded,

I have calculated ndwi for a reference area with Landsat , I wanted to know how can I extract the flooded area ?

Thanks very much

[giswqs]

Yes, you can customize your own legend.

https://geemap.org/notebooks/14_legends/#Add-customized-legends-for-Earth-Engine-data

Map = geemap.Map()

legend_keys = ['One', 'Two', 'Three', 'Four', 'ect']
 # colors can be defined using either hex code or RGB (0-255, 0-255, 0-255)
legend_colors = ['#8DD3C7', '#FFFFB3', '#BEBADA', '#FB8072', '#80B1D3']
# legend_colors = [(255, 0, 0), (127, 255, 0), (127, 18, 25), (36, 70, 180), (96, 68 123)]

Map.add_legend(legend_keys=legend_keys, legend_colors=legend_colors, position='bottomleft')
Map

Not sure what you meant by extracting the flooded area. Do you want to extract the image or just compute the statistics?

• For exporting images, see https://geemap.org/notebooks/11_export_image/
• For computing zonal statistics, see https://geemap.org/notebooks/12_zonal_statistics/
• Also see https://geemap.org/notebooks/41_water_app/
• For video tutorials, see https://www.youtube.com/playlist?list=PLAxJ4-o7ZoPccOFv1dCwvGI6TYnirRTg3

[reginadowlings]

I have a question. I exported a geemap with legend as an html file. But when I open the map in a browser, the legend does not appear. How do I fix this?

[giswqs]

For continuous colorbars, see https://geemap.org/notebooks/49_colorbar/