Removing specific key value pairs from geoJSON object
Question:
The following is a subset of my geoJSON object which has a combination of Multipolygons and GeometryCollections in its features. The GeometryCollections include multiple types of geometries.
json_str = '{"type": "FeatureCollection",
"features": [
{"id": "0",
"type": "Feature",
"properties": {"Date": "2019/07/10", "PID": "P1"},
"geometry": {"type": "GeometryCollection",
"geometries": [
{"type": "MultiPolygon",
"coordinates": [[[[138.5765, -35.0101], [138.5764, -35.0113], [138.5776, -35.0119], [138.5757, -35.0123], [138.5744, -35.013], [138.5739, -35.0119], [138.574, -35.0115], [138.5746, -35.0101], [138.5757, -35.0097], [138.5773, -35.0088], [138.5765, -35.0101]]], [[[138.6124, -35.0016], [138.612, -35.0011], [138.613, -35.0006], [138.6134, -35.0008], [138.6143, -35.0011], [138.613, -35.0024], [138.6124, -35.0016]]]]},
{"type": "MultiLineString",
"coordinates": [[[138.5625, -34.9778], [138.5609, -34.9791]], [[138.6042, -34.9885], [138.6042, -34.9886]]]},
{"type": "Point",
"coordinates": [138.6656, -34.8842]}]}},
{"id": "1",
"type": "Feature",
"properties": {"Date": "2019/07/10", "PID": "P2"},
"geometry": {
"type": "MultiPolygon",
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I’m trying to iterate over all my features and remove all geometries that are not Multipolygons or Polygons from my GeometryCollections. And converting all the GeomeetryCollections into Multipolygons as well.
I have tried the following in Python, with no luck
import json
geojson_obj = json.loads(json_str)
features = geojson_obj ['features']
for feature in features:
if feature['geometry']['type'] == 'GeometryCollection':
for geometry in feature['geometry']['geometries']:
if geometry['type'] != 'MultiPolygon':
geometry = None #maybe?
#print(geometry)
Answers:
It’s generally easier to assemble a new list that has only the items you want, instead of individually deleting the unwanted items from the old list.
And then, if you like, you can replace the old list with the new list.
A simple example of this:
numbers = [0,1,2,3,4,5,6,7,8,9]
# replace numbers with a version of itself that only contains
# numbers that are odd (i.e. n%2 is nonzero)
numbers = [n for n in numbers if n%2]
# numbers is now [1,3,5,7,9]
Applying this concept to your code would look something like this:
for feature in mydict["features"]:
if feature["geometry"]["type"] == "GeometryCollection":
feature["geometry"]["geometries"] = [geom for geom in feature["geometry"]["geometries"] if geom["type"] == "Polygon" or geom["type"] == "Multipolygon"]
You could create a new list of just the things you want to keep and substitute it into the original data structure. In the example case, this could be done with a list comprehension, but I’ve written a procedural example because of the other work you’d like to do.
import json
geojson_obj = json.loads(json_str)
features = geojson_obj ['features']
for feature in features:
if feature['geometry']['type'] == 'GeometryCollection':
keep_geometries = []
for geometry in feature['geometry']['geometries']:
if geometry['type'] == 'MultiPolygon':
keep_geometries.append(geometry)
feature['geometry']['geometries'] = keep_geometries
The following is a subset of my geoJSON object which has a combination of Multipolygons and GeometryCollections in its features. The GeometryCollections include multiple types of geometries.
json_str = '{"type": "FeatureCollection",
"features": [
{"id": "0",
"type": "Feature",
"properties": {"Date": "2019/07/10", "PID": "P1"},
"geometry": {"type": "GeometryCollection",
"geometries": [
{"type": "MultiPolygon",
"coordinates": [[[[138.5765, -35.0101], [138.5764, -35.0113], [138.5776, -35.0119], [138.5757, -35.0123], [138.5744, -35.013], [138.5739, -35.0119], [138.574, -35.0115], [138.5746, -35.0101], [138.5757, -35.0097], [138.5773, -35.0088], [138.5765, -35.0101]]], [[[138.6124, -35.0016], [138.612, -35.0011], [138.613, -35.0006], [138.6134, -35.0008], [138.6143, -35.0011], [138.613, -35.0024], [138.6124, -35.0016]]]]},
{"type": "MultiLineString",
"coordinates": [[[138.5625, -34.9778], [138.5609, -34.9791]], [[138.6042, -34.9885], [138.6042, -34.9886]]]},
{"type": "Point",
"coordinates": [138.6656, -34.8842]}]}},
{"id": "1",
"type": "Feature",
"properties": {"Date": "2019/07/10", "PID": "P2"},
"geometry": {
"type": "MultiPolygon",
"coordinates": [[[[138.5731, -34.9273], [138.5741, -34.9281], [138.5752, -34.9273], [138.5763, -34.9266], [138.5779, -34.9269], [138.5785, -34.9268], [138.5797, -34.9272], [138.5807, -34.928], [138.5814, -34.9276], [138.5809, -34.9282], [138.5807, -34.9285], [138.5794, -34.9292], [138.5785, -34.9299], [138.5766, -34.93], [138.5783, -34.9302], [138.5785, -34.9303], [138.5793, -34.9312], [138.5796, -34.9318], [138.579, -34.9332], [138.5795, -34.9336], [138.5803, -34.934], [138.5807, -34.9341], [138.5816, -34.9347], [138.5821, -34.9354], [138.5822, -34.9359], [138.5829, -34.9368], [138.5831, -34.937], [138.5836, -34.9372], [138.5843, -34.9379], [138.5843, -34.939], [138.5829, -34.9394], [138.5823, -34.9395], [138.5817, -34.939], [138.5823, -34.9377], [138.5807, -34.9385], [138.5792, -34.939], [138.5785, -34.9396], [138.5771, -34.9408], [138.5769, -34.9421], [138.5769, -34.9426], [138.5768, -34.944], [138.5785, -34.9437], [138.5788, -34.9441], [138.5789, -34.9444], [138.579, -34.9458], 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I’m trying to iterate over all my features and remove all geometries that are not Multipolygons or Polygons from my GeometryCollections. And converting all the GeomeetryCollections into Multipolygons as well.
I have tried the following in Python, with no luck
import json
geojson_obj = json.loads(json_str)
features = geojson_obj ['features']
for feature in features:
if feature['geometry']['type'] == 'GeometryCollection':
for geometry in feature['geometry']['geometries']:
if geometry['type'] != 'MultiPolygon':
geometry = None #maybe?
#print(geometry)
It’s generally easier to assemble a new list that has only the items you want, instead of individually deleting the unwanted items from the old list.
And then, if you like, you can replace the old list with the new list.
A simple example of this:
numbers = [0,1,2,3,4,5,6,7,8,9]
# replace numbers with a version of itself that only contains
# numbers that are odd (i.e. n%2 is nonzero)
numbers = [n for n in numbers if n%2]
# numbers is now [1,3,5,7,9]
Applying this concept to your code would look something like this:
for feature in mydict["features"]:
if feature["geometry"]["type"] == "GeometryCollection":
feature["geometry"]["geometries"] = [geom for geom in feature["geometry"]["geometries"] if geom["type"] == "Polygon" or geom["type"] == "Multipolygon"]
You could create a new list of just the things you want to keep and substitute it into the original data structure. In the example case, this could be done with a list comprehension, but I’ve written a procedural example because of the other work you’d like to do.
import json
geojson_obj = json.loads(json_str)
features = geojson_obj ['features']
for feature in features:
if feature['geometry']['type'] == 'GeometryCollection':
keep_geometries = []
for geometry in feature['geometry']['geometries']:
if geometry['type'] == 'MultiPolygon':
keep_geometries.append(geometry)
feature['geometry']['geometries'] = keep_geometries