40 lines
1.2 KiB
Python
40 lines
1.2 KiB
Python
import geopandas as gpd
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from shapely.geometry import Polygon, MultiPolygon
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from shapely.geometry.polygon import orient
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# Path to the input GeoJSON file
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input_file = 'data/cmm_test.geojson'
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# Path to the output GeoJSON file
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output_file = 'data/cmm_test_corrected.geojson'
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# Read the GeoJSON file
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gdf = gpd.read_file(input_file)
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# Set the CRS to EPSG:3857 if not already set
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if gdf.crs is None:
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gdf.set_crs(epsg=3857, inplace=True)
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# Convert the CRS to EPSG:4326 (longitude and latitude)
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gdf = gdf.to_crs(epsg=4326)
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# Function to reorient geometries to follow the right-hand rule
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def reorient_geometry(geom):
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if geom.is_empty:
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return geom
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elif geom.geom_type == 'Polygon':
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return orient(geom, sign=1.0)
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elif geom.geom_type == 'MultiPolygon':
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reoriented_polygons = [orient(polygon, sign=1.0) for polygon in geom.geoms]
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return MultiPolygon(reoriented_polygons)
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else:
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return geom
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# Apply the reorientation to the geometry column
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gdf['geometry'] = gdf['geometry'].apply(reorient_geometry)
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# Save the transformed GeoDataFrame to a new GeoJSON file
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gdf.to_file(output_file, driver='GeoJSON')
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print(f"Converted GeoJSON with right-hand rule orientation has been saved to {output_file}")
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