Before we continue, as part of the workaround for windows users we will need to export our geo objects as files.
We will use the GeoJSON file format. It's a good choice of format for exporting geographic data because:
It's human-readable
It's an open standard
It's easy to make code that exports GeoJSON
Mapnik can import it
The properties/attributes can have multiple levels
Here you can see the same example of a GeoJSON file that we saw in Chapter 3, Combining Multiple Data Sources – How Geographic Data is Represented. You don't need to type it, we are just going to use it as a reference to write our export code:
{"type": "FeatureCollection",
"features": [
{"type": "Feature",
"geometry": {
"type": "Point",
"coordinates": [102.0, 0.5]},
"properties": {"prop0": "value0"}
},
{"type": "Feature",
"geometry": {
"type": "LineString",
"coordinates": [[102.0, 0.0], [103.0, 1.0], [104.0, 0.0]]
},
"properties":...