Formatters
A Formatter converts features to a different format, such as GeoJSON or Well-Known Text. A Formatter’s output can be customized, then turned into a string or saved to a file.
Properties
These properties customize the Formatter’s output.
Formatter.mercator
Default: False
If set to True, outputs Mercator-projected coordinates instead of WGS-84 (degrees longitude/latitude).
Formatter.precision
Default: 7
The number of digits after the decimal point for coordinate values (A value of 7 equates to a resolution of about 1 cm).
Formatter.pretty
Default: False
If set to True, adds tabs and spacing to make the output easier to read.
Methods
Formatter.save(filename)
Writes the output to a file. If filename has no extension, a default is used.
streets.geojson.save('london-streets') # Creates london-streets.geojson
GeoJSON
GeoJSON is a widely used format for representing geographic features. For each Feature, the Formatter writes its ID, geometry and properties (its OSM tags).
{
"type": "FeatureCollection",
"generator": "geodesk-py/0.1.0",
"features": [
{
"type": "Feature",
"id": "W6001627",
"geometry": {
"type": "LineString",
"coordinates": [
[-117.280372, 32.8393748], [-117.2803909, 32.8396239],
[-117.2803957, 32.839872], ... ]
},
"properties": {
"highway": "secondary",
"name": "Prospect Street",
...
},
...
}
]
}
Line-based variant 0.2
As an alternative to classic GeoJSON, each Feature is written on a separate line:
{ "type": "Feature", "id": "W6001627", "geometry": { "type": "LineString", ... }}
{ "type": "Feature", "id": "N596184365", "geometry": { "type": "Point", ... }}
Well-Known Text
Well-Know Text (WKT) represents the geometric shapes of features (without IDs or tags).
GEOMETRYCOLLECTION(
LINESTRING(-117.280372 32.8393748, -117.2803909 32.8396239, ...),
...)