This library contains:
- Functions for encoding and decoding GeoJSON formatted data
- Classes for all GeoJSON Objects
- An implementation of the Python __geo_interface__ Specification
Table of Contents
python-geojson is compatible with Python 2.7, 3.5, 3.6 and 3.7. It is listed on PyPi as 'geojson'. The recommended way to install is via pip:
pip install geojson
This library implements all the GeoJSON Objects described in The GeoJSON Format Specification.
All object keys can also be used as attributes.
The objects contained in GeometryCollection and FeatureCollection can be indexed directly.
>>> from geojson import Point
>>> Point((-115.81, 37.24)) # doctest: +ELLIPSIS
{"coordinates": [-115.8..., 37.2...], "type": "Point"}
Visualize the result of the example above here. General information about Point can be found in Section 3.1.2 and Appendix A: Points within The GeoJSON Format Specification.
>>> from geojson import MultiPoint
>>> MultiPoint([(-155.52, 19.61), (-156.22, 20.74), (-157.97, 21.46)]) # doctest: +ELLIPSIS
{"coordinates": [[-155.5..., 19.6...], [-156.2..., 20.7...], [-157.9..., 21.4...]], "type": "MultiPoint"}
Visualize the result of the example above here. General information about MultiPoint can be found in Section 3.1.3 and Appendix A: MultiPoints within The GeoJSON Format Specification.
>>> from geojson import LineString
>>> LineString([(8.919, 44.4074), (8.923, 44.4075)]) # doctest: +ELLIPSIS
{"coordinates": [[8.91..., 44.407...], [8.92..., 44.407...]], "type": "LineString"}
Visualize the result of the example above here. General information about LineString can be found in Section 3.1.4 and Appendix A: LineStrings within The GeoJSON Format Specification.
>>> from geojson import MultiLineString
>>> MultiLineString([
... [(3.75, 9.25), (-130.95, 1.52)],
... [(23.15, -34.25), (-1.35, -4.65), (3.45, 77.95)]
... ]) # doctest: +ELLIPSIS
{"coordinates": [[[3.7..., 9.2...], [-130.9..., 1.52...]], [[23.1..., -34.2...], [-1.3..., -4.6...], [3.4..., 77.9...]]], "type": "MultiLineString"}
Visualize the result of the example above here. General information about MultiLineString can be found in Section 3.1.5 and Appendix A: MultiLineStrings within The GeoJSON Format Specification.
>>> from geojson import Polygon
>>> # no hole within polygon
>>> Polygon([[(2.38, 57.322), (23.194, -20.28), (-120.43, 19.15), (2.38, 57.322)]]) # doctest: +ELLIPSIS
{"coordinates": [[[2.3..., 57.32...], [23.19..., -20.2...], [-120.4..., 19.1...]]], "type": "Polygon"}
>>> # hole within polygon
>>> Polygon([
... [(2.38, 57.322), (23.194, -20.28), (-120.43, 19.15), (2.38, 57.322)],
... [(-5.21, 23.51), (15.21, -10.81), (-20.51, 1.51), (-5.21, 23.51)]
... ]) # doctest: +ELLIPSIS
{"coordinates": [[[2.3..., 57.32...], [23.19..., -20.2...], [-120.4..., 19.1...]], [[-5.2..., 23.5...], [15.2..., -10.8...], [-20.5..., 1.5...], [-5.2..., 23.5...]]], "type": "Polygon"}
Visualize the results of the example above here. General information about Polygon can be found in Section 3.1.6 and Appendix A: Polygons within The GeoJSON Format Specification.
>>> from geojson import MultiPolygon
>>> MultiPolygon([
... ([(3.78, 9.28), (-130.91, 1.52), (35.12, 72.234), (3.78, 9.28)],),
... ([(23.18, -34.29), (-1.31, -4.61), (3.41, 77.91), (23.18, -34.29)],)
... ]) # doctest: +ELLIPSIS
{"coordinates": [[[[3.7..., 9.2...], [-130.9..., 1.5...], [35.1..., 72.23...]]], [[[23.1..., -34.2...], [-1.3..., -4.6...], [3.4..., 77.9...]]]], "type": "MultiPolygon"}
Visualize the result of the example above here. General information about MultiPolygon can be found in Section 3.1.7 and Appendix A: MultiPolygons within The GeoJSON Format Specification.
>>> from geojson import GeometryCollection, Point, LineString
>>> my_point = Point((23.532, -63.12))
>>> my_line = LineString([(-152.62, 51.21), (5.21, 10.69)])
>>> geo_collection = GeometryCollection([my_point, my_line])
>>> geo_collection # doctest: +ELLIPSIS
{"geometries": [{"coordinates": [23.53..., -63.1...], "type": "Point"}, {"coordinates": [[-152.6..., 51.2...], [5.2..., 10.6...]], "type": "LineString"}], "type": "GeometryCollection"}
>>> geo_collection[1]
{"coordinates": [[-152.62, 51.21], [5.21, 10.69]], "type": "LineString"}
>>> geo_collection[0] == geo_collection.geometries[0]
True
Visualize the result of the example above here. General information about GeometryCollection can be found in Section 3.1.8 and Appendix A: GeometryCollections within The GeoJSON Format Specification.
>>> from geojson import Feature, Point
>>> my_point = Point((-3.68, 40.41))
>>> Feature(geometry=my_point) # doctest: +ELLIPSIS
{"geometry": {"coordinates": [-3.68..., 40.4...], "type": "Point"}, "properties": {}, "type": "Feature"}
>>> Feature(geometry=my_point, properties={"country": "Spain"}) # doctest: +ELLIPSIS
{"geometry": {"coordinates": [-3.68..., 40.4...], "type": "Point"}, "properties": {"country": "Spain"}, "type": "Feature"}
>>> Feature(geometry=my_point, id=27) # doctest: +ELLIPSIS
{"geometry": {"coordinates": [-3.68..., 40.4...], "type": "Point"}, "id": 27, "properties": {}, "type": "Feature"}
Visualize the results of the examples above here. General information about Feature can be found in Section 3.2 within The GeoJSON Format Specification.
>>> from geojson import Feature, Point, FeatureCollection
>>> my_feature = Feature(geometry=Point((1.6432, -19.123)))
>>> my_other_feature = Feature(geometry=Point((-80.234, -22.532)))
>>> feature_collection = FeatureCollection([my_feature, my_other_feature])
>>> feature_collection # doctest: +ELLIPSIS
{"features": [{"geometry": {"coordinates": [1.643..., -19.12...], "type": "Point"}, "properties": {}, "type": "Feature"}, {"geometry": {"coordinates": [-80.23..., -22.53...], "type": "Point"}, "properties": {}, "type": "Feature"}], "type": "FeatureCollection"}
>>> feature_collection.errors()
[]
>>> (feature_collection[0] == feature_collection['features'][0], feature_collection[1] == my_other_feature)
(True, True)
Visualize the result of the example above here. General information about FeatureCollection can be found in Section 3.3 within The GeoJSON Format Specification.
All of the GeoJSON Objects implemented in this library can be encoded and decoded into raw GeoJSON with the geojson.dump
, geojson.dumps
, geojson.load
, and geojson.loads
functions. Note that each of these functions is a wrapper around the core json function with the same name, and will pass through any additional arguments. This allows you to control the JSON formatting or parsing behavior with the underlying core json functions.
>>> import geojson
>>> my_point = geojson.Point((43.24, -1.532))
>>> my_point # doctest: +ELLIPSIS
{"coordinates": [43.2..., -1.53...], "type": "Point"}
>>> dump = geojson.dumps(my_point, sort_keys=True)
>>> dump # doctest: +ELLIPSIS
'{"coordinates": [43.2..., -1.53...], "type": "Point"}'
>>> geojson.loads(dump) # doctest: +ELLIPSIS
{"coordinates": [43.2..., -1.53...], "type": "Point"}
This encoding/decoding functionality shown in the previous can be extended to custom classes using the interface described by the __geo_interface__ Specification.
>>> import geojson
>>> class MyPoint():
... def __init__(self, x, y):
... self.x = x
... self.y = y
...
... @property
... def __geo_interface__(self):
... return {'type': 'Point', 'coordinates': (self.x, self.y)}
>>> point_instance = MyPoint(52.235, -19.234)
>>> geojson.dumps(point_instance, sort_keys=True) # doctest: +ELLIPSIS
'{"coordinates": [52.23..., -19.23...], "type": "Point"}'
geojson.utils.coords
yields all coordinate tuples from a geometry or feature object.
>>> import geojson
>>> my_line = LineString([(-152.62, 51.21), (5.21, 10.69)])
>>> my_feature = geojson.Feature(geometry=my_line)
>>> list(geojson.utils.coords(my_feature)) # doctest: +ELLIPSIS
[(-152.62..., 51.21...), (5.21..., 10.69...)]
geojson.utils.map_coords
maps a function over all coordinate values and returns a geometry of the same type. Useful for scaling a geometry.
>>> import geojson
>>> new_point = geojson.utils.map_coords(lambda x: x/2, geojson.Point((-115.81, 37.24)))
>>> geojson.dumps(new_point, sort_keys=True) # doctest: +ELLIPSIS
'{"coordinates": [-57.905..., 18.62...], "type": "Point"}'
geojson.utils.map_tuples
maps a function over all coordinates and returns a geometry of the same type. Useful for changing coordinate order or applying coordinate transforms.
>>> import geojson
>>> new_point = geojson.utils.map_tuples(lambda c: (c[1], c[0]), geojson.Point((-115.81, 37.24)))
>>> geojson.dumps(new_point, sort_keys=True) # doctest: +ELLIPSIS
'{"coordinates": [37.24..., -115.81], "type": "Point"}'
geojson.utils.map_geometries
maps a function over each geometry in the input.
>>> import geojson
>>> new_point = geojson.utils.map_geometries(lambda g: geojson.MultiPoint([g["coordinates"]]), geojson.GeometryCollection([geojson.Point((-115.81, 37.24))]))
>>> geojson.dumps(new_point, sort_keys=True)
'{"geometries": [{"coordinates": [[-115.81, 37.24]], "type": "MultiPoint"}], "type": "GeometryCollection"}'
is_valid
property provides simple validation of GeoJSON objects.
>>> import geojson
>>> obj = geojson.Point((-3.68,40.41,25.14,10.34))
>>> obj.is_valid
False
errors
method provides collection of errors when validation GeoJSON objects.
>>> import geojson
>>> obj = geojson.Point((-3.68,40.41,25.14,10.34))
>>> obj.errors()
'a position must have exactly 2 or 3 values'
geojson.utils.generate_random
yields a geometry type with random data
>>> import geojson
>>> geojson.utils.generate_random("LineString") # doctest: +ELLIPSIS
{"coordinates": [...], "type": "LineString"}
>>> geojson.utils.generate_random("Polygon") # doctest: +ELLIPSIS
{"coordinates": [...], "type": "Polygon"}
To build this project, run python setup.py build
.
To run the unit tests, run python setup.py test
.
To run the style checks, run flake8
(install flake8 if needed).
- Sean Gillies <sgillies@frii.com>
- Matthew Russell <matt@sanoodi.com>
- Corey Farwell <coreyf@rwell.org>
- Blake Grotewold <hello@grotewold.me>
- Zsolt Ero <zsolt.ero@gmail.com>
- Sergey Romanov <xxsmotur@gmail.com>