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geo_line.vg.json
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geo_line.vg.json
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{
"$schema": "https://vega.github.io/schema/vega/v5.json",
"description": "Line drawn between airports in the U.S. simulating a flight itinerary",
"background": "white",
"padding": 5,
"width": 800,
"height": 500,
"style": "view",
"data": [
{
"name": "source_0",
"url": "data/us-10m.json",
"format": {"type": "topojson", "feature": "states"}
},
{"name": "source_1", "url": "data/airports.csv", "format": {"type": "csv"}},
{
"name": "source_2",
"values": [
{"airport": "SEA", "order": 1},
{"airport": "SFO", "order": 2},
{"airport": "LAX", "order": 3},
{"airport": "LAS", "order": 4},
{"airport": "DFW", "order": 5},
{"airport": "DEN", "order": 6},
{"airport": "ORD", "order": 7},
{"airport": "JFK", "order": 8}
]
},
{
"name": "data_0",
"source": "source_1",
"transform": [
{
"type": "geojson",
"fields": ["longitude", "latitude"],
"signal": "layer_1_geojson_0"
},
{
"type": "geopoint",
"projection": "projection",
"fields": ["longitude", "latitude"],
"as": ["layer_1_x", "layer_1_y"]
}
]
},
{
"name": "data_1",
"source": "source_2",
"transform": [
{
"type": "lookup",
"from": "source_1",
"key": "iata",
"fields": ["airport"],
"values": ["latitude", "longitude"]
},
{
"type": "geojson",
"fields": ["longitude", "latitude"],
"signal": "layer_2_geojson_0"
},
{
"type": "geopoint",
"projection": "projection",
"fields": ["longitude", "latitude"],
"as": ["layer_2_x", "layer_2_y"]
}
]
}
],
"projections": [
{
"name": "projection",
"size": {"signal": "[width, height]"},
"fit": {
"signal": "[data('source_0'), layer_1_geojson_0, layer_2_geojson_0]"
},
"type": "albersUsa"
}
],
"marks": [
{
"name": "layer_0_marks",
"type": "shape",
"style": ["geoshape"],
"from": {"data": "source_0"},
"encode": {
"update": {
"fill": {"value": "#eee"},
"stroke": {"value": "white"},
"ariaRoleDescription": {"value": "geoshape"}
}
},
"transform": [{"type": "geoshape", "projection": "projection"}]
},
{
"name": "layer_1_marks",
"type": "symbol",
"style": ["circle"],
"from": {"data": "data_0"},
"encode": {
"update": {
"opacity": {"value": 0.7},
"fill": {"value": "gray"},
"ariaRoleDescription": {"value": "circle"},
"description": {
"signal": "\"longitude: \" + (format(datum[\"longitude\"], \"\")) + \"; latitude: \" + (format(datum[\"latitude\"], \"\"))"
},
"x": {"field": "layer_1_x"},
"y": {"field": "layer_1_y"},
"size": {"value": 5},
"shape": {"value": "circle"}
}
}
},
{
"name": "layer_2_marks",
"type": "line",
"style": ["line"],
"sort": {"field": ["datum[\"order\"]"], "order": ["ascending"]},
"from": {"data": "data_1"},
"encode": {
"update": {
"stroke": {"value": "#4c78a8"},
"description": {
"signal": "\"longitude: \" + (format(datum[\"longitude\"], \"\")) + \"; latitude: \" + (format(datum[\"latitude\"], \"\")) + \"; order: \" + (isValid(datum[\"order\"]) ? datum[\"order\"] : \"\"+datum[\"order\"])"
},
"x": {"field": "layer_2_x"},
"y": {"field": "layer_2_y"}
}
}
}
]
}