python - 用Python方式反转GeoJSON响应中的lon，lat坐标

我想将这个JSON响应中的坐标顺序从（lat，lon）反转为（lon，lat）：

url='https://www.sciencebase.gov/catalogMaps/mapping/ows/5342c5fce4b0aa151574a8ed?\
service=wfs&version=1.1.0&request=GetFeature&typeNames=sb:Conservation_Zone_WGS84&outputFormat=application/json'
response = requests.get(url).json()
print response

{u'crs': {u'properties': {u'code': u'4326'}, u'type': u'EPSG'},
 u'features': [{u'geometry': {u'coordinates': [[[[39.81487959537135,
        -74.09688169446223],
       [39.81488113835475, -74.09587338924456],
       [39.8143317590967, -74.09614209870023],
       [39.8137616151959, -74.09633047532941],
       [39.812950626580545, -74.09670529470912],
       [39.8120075697193, -74.09698124228382],
       [39.814255381955064, -74.0973277412355],
       [39.81487959537135, -74.09688169446223]]]],
    u'type': u'MultiPolygon'},
   u'geometry_name': u'the_geom',
   u'id': u'Conservation_Zone_WGS84.1',
   u'properties': {u'ID': 1,
    u'NAME': u'Sedge Island Marine Conservation Zone',
    u'OBJECTID': 1,
    u'SHAPE_AREA': 70259289.0821,
    u'SHAPE_LEN': 40592.8006466,
    u'WEB_LINK': u'http://www.state.nj.us/dep/fgw/sedge.htm'},
   u'type': u'Feature'}],
 u'type': u'FeatureCollection'}

我可以把它拆开，用蛮力把它压回去，但我想知道：什么样的方法能在保持结构完整的同时改变顺序呢？

最佳答案

使用numpy的解决方案应该适用于任何geojson。它将翻转所有“坐标”。

import json
import requests
import numpy as np


def flip_geojson_coordinates(geo):
    if isinstance(geo, dict):
        for k, v in geo.iteritems():
            if k == "coordinates":
                z = np.asarray(geo[k])
                f = z.flatten()
                geo[k] = np.dstack((f[1::2], f[::2])).reshape(z.shape).tolist()
            else:
                flip_geojson_coordinates(v)
    elif isinstance(geo, list):
        for k in geo:
            flip_geojson_coordinates(k)

url = "https://www.sciencebase.gov/catalogMaps/mapping/ows/5342c5fce4b0aa151574a8ed?\
service=wfs&version=1.1.0&request=GetFeature&typeNames=sb:Conservation_Zone_WGS84&outputFormat=application/json"
resp = requests.get(url)
gj = json.loads(resp.text)

print gj
flip_geojson_coordinates(gj)
print gj

关于python - 用Python方式反转GeoJSON响应中的lon，lat坐标，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/23019143/