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python - 在 Python 中合并两个 GEOJSON 多边形

转载 作者:太空狗 更新时间:2023-10-29 21:36:43 25 4
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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?

最佳答案

这就是我如何使用来自 functools 的包/模块 json、geojson、shapely、pyproj 和 partial 来做到这一点:

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)

关于python - 在 Python 中合并两个 GEOJSON 多边形,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34325030/

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