Write GeoJson into a .geojson file with Python

Question

I want to write a geosjon object with the type <class 'geojson.feature.Feature'> into a .geosjon file. Therefore I tried to use

with open(test.geosjon, 'w') as outfile:
 geojson.dump(geosjon_geometries, outfile)

But i get the error TypeError: coercing to Unicode: need string or buffer, tuple found I figured out that with this function a dict is needed to write it into a geosjon file. Is there another possibility to write a geojson feature in a file?

The function looks like:

def write_json(self, features):
 # feature is a shapely geometry feature
 geom_in_geojson = geojson.Feature(geometry=features, properties={})
 tmp_file = tempfile.mkstemp(suffix='.geojson')
 with open(tmp_file, 'w') as outfile:
 geojson.dump(geom_in_geojson, outfile)
 return tmp_file

The input is a shapely geometry, e.g. MultiLineString or LineString

• crmackey: Can you show the logic for the class? I would recommend working with the json module.
• Martin: I added the function to the question
• Martin: I found the solution. It is working like this. The problem was the funktion tempfile.mkstep(). This returns a touple. So for the correct path to the temporary file it has to be used tmp_file[1].

Answer 1

Dumping a list of features directly does not create a valid GeoJSON file.

To create valid GeoJSON:

1. Create a list of features (where each feature has geometry and optional properties)
2. Create a collection (e.g. FeatureCollection) with those features
3. Dump the collection to a file.

e.g.

from geojson import Point, Feature, FeatureCollection, dump
point = Point((-115.81, 37.24))
features = []
features.append(Feature(geometry=point, properties={"country": "Spain"}))
# add more features...
# features.append(...)
feature_collection = FeatureCollection(features)
with open('myfile.geojson', 'w') as f:
 dump(feature_collection, f)

Output:

{
 "type": "FeatureCollection",
 "features": [{
 "geometry": {
 "type": "Point",
 "coordinates": [-115.81, 37.24]
 },
 "type": "Feature",
 "properties": {
 "country": "Spain"
 }
 }]
}

• beahacker: thank for a good answer. GeoJson can accept a shapely geometry object.

Answer 2

To write a geojson object to a temporary file this function can be used:

import geojson
import tempfile
def write_json(self, features):
 # feature is a shapely geometry type
 geom_in_geojson = geojson.Feature(geometry=features, properties={})
 tmp_file = tempfile.mkstemp(suffix='.geojson')
 with open(tmp_file[1], 'w') as outfile:
 geojson.dump(geom_in_geojson, outfile)
 return tmp_file[1]

• Abhilash Singh Chauhan: can you break it down, I want to store geopandas GoDataFrame as temporary file, I changed the code as: import geojson import tempfile def write_json(self, features): geom_in_geojson = geojson.Feature(geometry=df_new['geometry'], properties={df_new['pod']}) tmp_file = tempfile.mkstemp(suffix='.geojson') print(tmp_file[1]) with open(tmp_file[1], 'w') as outfile: print(tmp_file[1]) geojson.dump(geom_in_geojson, outfile) return tmp_file[1] ## but it did not worked @Martin
• Abhilash Singh Chauhan: what are self, features in def write_json(self, features):

Answer 3

Supposing that geom is a shapely geometry object, you can use

from shapely.geometry import mapping
import json
geojson = json.dumps(mapping(geom))