有没有办法在python中合并两个重叠的GEOJSON多边形,返回一个合并的GEOJSON对象?
解决方法:
这就是我能够使用functools中的包/模块json,geojson,shapely,pyproj和partial来实现它的方法:
import json
import geojson
from functools import partial
import pyproj
import shapely.geometry
import shapely.ops
# reading into two geojson objects, in a GCS (WGS84)
with open('file1.json') as geojson1:
poly1_geojson = json.load(geojson1)
with open('file2.json') as geojson2:
poly2_geojson = json.load(geojson2)
# pulling out the polygons
poly1 = shapely.geometry.asShape(poly1_geojson['features'][2]['geometry'])
poly2 = shapely.geometry.asShape(poly2_geojson['features'][2]['geometry'])
# checking to make sure they registered as polygons
print poly1.geom_type
print poly2.geom_type
# merging the polygons - they are feature collections, containing a point, a polyline, and a polygon - I extract the polygon
# for my purposes, they overlap, so merging produces a single polygon rather than a list of polygons
mergedPolygon = poly1.union(poly2)
# using geojson module to convert from WKT back into GeoJSON format
geojson_out = geojson.Feature(geometry=mergedPolygon, properties={})
# outputting the updated geojson file - for mapping/storage in its GCS format
with open('Merged_Polygon.json', 'w') as outfile:
json.dump(geojson_out.geometry, outfile, indent=3, encoding="utf-8")
outfile.close()
# reprojecting the merged polygon to determine the correct area
# it is a polygon covering much of the US, and dervied form USGS data, so using Albers Equal Area
project = partial(
pyproj.transform,
pyproj.Proj(init='epsg:4326'),
pyproj.Proj(init='epsg:5070'))
mergedPolygon_proj = shapely.ops.transform(project,mergedPolygon)
标签:python,geojson 来源: https://codeday.me/bug/20190516/1116375.html
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