marshmallow_geojson 0.5.0

Marshmallow schema validation for GeoJson

marshmallow_geojson 🌍

GeoJSON Objects	Status
Point	✅
MultiPoint	✅
LineString	✅
MultiLineString	✅
Polygon	✅
MultiPolygon	✅
GeometryCollection	✅
Feature	✅
FeatureCollection	✅
Bbox	✅

Installation

marshmallow_geojson is compatible with Python 3.7 and 3.8. The recommended way to install is via poetry:

poetry add marshmallow_geojson

Using pip to install is also possible.

pip install marshmallow_geojson

GEOJSON

GeoJSON is a format for encoding a variety of geographic data structures.

{
  "type": "Feature",
  "geometry": {
    "type": "Point",
    "coordinates": [125.6, 10.1]
  },
  "properties": {
    "name": "Dinagat Islands"
  }
}

GeoJSON supports the following geometry types: Point, LineString, Polygon, MultiPoint, MultiLineString, and MultiPolygon. Geometric objects with additional properties are Feature objects. Sets of features are contained by FeatureCollection objects.

Examples of using

Custom properties:

from marshmallow.fields import Str, Nested
from marshmallow_geojson import GeoJSONSchema, PropertiesSchema, FeatureSchema

class MyPropertiesSchema(PropertiesSchema):
    name = Str(required=True)

class MyFeatureSchema(FeatureSchema):
    properties = Nested(
        MyPropertiesSchema,
        required=True,
    )

class MyGeoJSONSchema(GeoJSONSchema):
    feature_schema = MyFeatureSchema

>>> geojson_text = '{"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [[[-80.724878, 35.265454], [-80.722646, 35.260338]]]}, "properties": {"name": "foo name"}}'
>>> geojson_schema = MyGeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'geometry': {'coordinates': [[(-80.724878, 35.265454), (-80.722646, 35.260338)]], 'type': 'Polygon'}, 'properties': {'name': 'foo name'}, 'type': 'Feature'}

Point

Simple example data:

>>> from marshmallow_geojson import GeoJSONSchema
>>> geojson_text = '{"type": "Point","coordinates": [-105.01621, 39.57422]}'
>>> geojson_many_text = '[{"type": "Point","coordinates": [-105.01621, 39.57422]}]'
>>> geojson_dc = {"type": "Point","coordinates": [-105.01621, 39.57422]}

>>> geojson_schema = GeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'type': 'Point', 'coordinates': (-105.01621, 39.57422)}

>>> geojson_schema.load(geojson_dc)
{'type': 'Point', 'coordinates': (-105.01621, 39.57422)}

>>> geojson_schema.dumps(geojson_dc)
{'type': 'Point', 'coordinates': (-105.01621, 39.57422)}

>>> geojson_schema.dump(geojson_dc)
{'type': 'Point', 'coordinates': (-105.01621, 39.57422)}

>>> geojson_schema = GeoJSONSchema(many=True)
>>> geojson_schema.loads(geojson_many_text)
[{'type': 'Point', 'coordinates': (-105.01621, 39.57422)}]

MultiPoint

Simple example data:

>>> from marshmallow_geojson import GeoJSONSchema
>>> geojson_text = '{"type": "MultiPoint", "coordinates": [ [-105.01621, 39.57422], [-80.666513, 35.053994] ]}'
>>> geojson_schema = GeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'type': 'MultiPoint', 'coordinates': [(-105.01621, 39.57422), (-80.666513, 35.053994)]}

LineString

Simple example data:

>>> from marshmallow_geojson import GeoJSONSchema
>>> geojson_text = '{"type": "LineString", "coordinates": [ [-99.113159, 38.869651], [-99.0802, 38.85682], [-98.822021, 38.85682], [-98.448486, 38.848264] ]}'
>>> geojson_schema = GeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'type': 'LineString', 'coordinates': [(-99.113159, 38.869651), (-99.0802, 38.85682), (-98.822021, 38.85682), (-98.448486, 38.848264)]}

MultiLineString

Simple example data:

>>> from marshmallow_geojson import GeoJSONSchema
>>> geojson_text = '{"type": "MultiLineString", "coordinates": [ [ [-105.019898, 39.574997], [-105.019598, 39.574898], [-105.019061, 39.574782] ], [ [-105.017173, 39.574402], [-105.01698, 39.574385], [-105.016636, 39.574385], [-105.016508, 39.574402], [-105.01595, 39.57427] ], [ [-105.014276, 39.573972], [-105.014126, 39.574038], [-105.013825, 39.57417], [-105.01331, 39.574452] ] ]}'
>>> geojson_schema = GeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'type': 'MultiLineString', 'coordinates': [[(-105.019898, 39.574997), (-105.019598, 39.574898), (-105.019061, 39.574782)], [(-105.017173, 39.574402), (-105.01698, 39.574385), (-105.016636, 39.574385), (-105.016508, 39.574402), (-105.01595, 39.57427)], [(-105.014276, 39.573972), (-105.014126, 39.574038), (-105.013825, 39.57417), (-105.01331, 39.574452)]]}

Polygon

Simple example data:

>>> from marshmallow_geojson import GeoJSONSchema
>>> geojson_text = '{"type": "Polygon", "coordinates": [ [ [100, 0], [101, 0], [101, 1], [100, 1], [100, 0] ] ]}'
>>> geojson_schema = GeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'type': 'Polygon', 'coordinates': [[(100.0, 0.0), (101.0, 0.0), (101.0, 1.0), (100.0, 1.0), (100.0, 0.0)]]}

MultiPolygon

Simple example data:

>>> from marshmallow_geojson import GeoJSONSchema
>>> geojson_text = '{"type": "MultiPolygon", "coordinates": [ [ [ [107, 7], [108, 7], [108, 8], [107, 8], [107, 7] ] ], [ [ [100, 0], [101, 0], [101, 1], [100, 1], [100, 0] ] ] ]}'
>>> geojson_schema = GeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'type': 'MultiPolygon', 'coordinates': [[[(107.0, 7.0), (108.0, 7.0), (108.0, 8.0), (107.0, 8.0), (107.0, 7.0)]], [[(100.0, 0.0), (101.0, 0.0), (101.0, 1.0), (100.0, 1.0), (100.0, 0.0)]]]}

GeometryCollection

Simple example data:

>>> from marshmallow_geojson import GeoJSONSchema
>>> geojson_text = '{"type": "GeometryCollection", "geometries": [{"type": "Point", "coordinates": [-80.660805, 35.049392]}, {"type": "Polygon", "coordinates": [ [ [-80.664582, 35.044965], [-80.663874, 35.04428], [-80.662586, 35.04558], [-80.663444, 35.046036], [-80.664582, 35.044965] ] ]}, {"type": "LineString", "coordinates": [[-80.662372, 35.059509], [-80.662693, 35.059263], [-80.662844, 35.05893] ]}]}'
>>> geojson_schema = GeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'type': 'GeometryCollection', 'geometries': [{'type': 'Point', 'coordinates': (-80.660805, 35.049392)}, {'type': 'Polygon', 'coordinates': [[(-80.664582, 35.044965), (-80.663874, 35.04428), (-80.662586, 35.04558), (-80.663444, 35.046036), (-80.664582, 35.044965)]]}, {'type': 'LineString', 'coordinates': [(-80.662372, 35.059509), (-80.662693, 35.059263), (-80.662844, 35.05893)]}]}

Feature

Simple example data:

>>> from marshmallow_geojson import GeoJSONSchema
>>> geojson_text = '{"type": "Feature", "geometry": { "type": "Polygon", "coordinates": [ [ [-80.724878, 35.265454], [-80.722646, 35.260338], [-80.720329, 35.260618], [-80.71681, 35.255361], [-80.704793, 35.268397], [-82.715179, 35.267696], [-80.721359, 35.267276], [-80.724878, 35.265454] ] ] }, "properties": {} }'
>>> geojson_schema = GeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'type': 'Feature', 'properties': {}, 'geometry': {'type': 'Polygon', 'coordinates': [[(-80.724878, 35.265454), (-80.722646, 35.260338), (-80.720329, 35.260618), (-80.71681, 35.255361), (-80.704793, 35.268397), (-82.715179, 35.267696), (-80.721359, 35.267276), (-80.724878, 35.265454)]]}}

FeatureCollection

Simple example data:

>>> from marshmallow_geojson import GeoJSONSchema
>>> geojson_text = '{"type": "FeatureCollection", "features": [{"type": "Feature", "geometry": {"type": "Point", "coordinates": [-80.870885, 35.215151] }, "properties": {} }, {"type": "Feature", "geometry": {"type": "Polygon", "coordinates": [ [ [-80.724878, 35.265454], [-80.722646, 35.260338], [-80.720329, 35.260618], [-80.704793, 35.268397], [-80.724878, 35.265454] ] ]}, "properties": {}} ] }'
>>> geojson_schema = GeoJSONSchema()
>>> geojson_schema.loads(geojson_text)
{'type': 'FeatureCollection', 'features': [{'type': 'Feature', 'geometry': {'type': 'Point', 'coordinates': (-80.870885, 35.215151)}, 'properties': {}}, {'type': 'Feature', 'geometry': {'type': 'Polygon', 'coordinates': [[(-80.724878, 35.265454), (-80.722646, 35.260338), (-80.720329, 35.260618), (-80.704793, 35.268397), (-80.724878, 35.265454)]]}, 'properties': {}}]}

Bbox

Set bbox:

from marshmallow.fields import List, Number
from marshmallow_geojson import PolygonSchema
from marshmallow_geojson.validate import Bbox

  class MyBboxSchema(PolygonSchema):
      bbox = List(
          Number(
              required=True,
          ),
          required=True,
          validate=Bbox(
              min_lon=-180,
              max_lon=180,
              min_lat=-90,
              max_lat=90,
          ),
      )

>>> geojson_text = '{"type": "Polygon", "bbox": [10, 10, 10, 10] , "coordinates": [[[100, 0], [101, 0], [101, 1], [100, 1], [100, 0]]]}'
>>> my_bbox_schema = MyBboxSchema()
>>> my_bbox_schema.loads(geojson_text)
{'type': 'Polygon', 'bbox': [10, 10, 10, 10] , 'coordinates': [[[100, 0], [101, 0], [101, 1], [100, 1], [100, 0]]]}