本文介绍了在Python中合并两个GEOJSON多边形的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
有没有办法在python中合并两个重叠的GEOJSON多边形,并返回一个合并的GEOJSON对象?
Is there a way to merge two overlapping GEOJSON polygons in python, returning a single merged GEOJSON object?
推荐答案
这就是我使用包/模块json,geojson,shapely,pyproj和来自functools的部分代码来做到这一点的方法:
This is how I was able to do it using the packages/modules json, geojson, shapely, pyproj, and partial from functools:
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)
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