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ee.FeatureCollection.union
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Merges all geometries in a given collection into one and returns a collection containing a single feature with only an ID of 'union_result' and a geometry.
Usage Returns FeatureCollection. union (maxError )
FeatureCollection
Argument Type Details this: collection
FeatureCollection The collection being merged. maxError
ErrorMargin, default: null The maximum error allowed when performing any necessary reprojections. If not specified, defaults to the error margin requested from the output.
Examples
Code Editor (JavaScript)
// FeatureCollection of power plants in Belgium.
var fc = ee.FeatureCollection('WRI/GPPD/power_plants')
.filter('country_lg == "Belgium"');
print('Original FeatureCollection', fc);
// Merge all geometries into one. A FeatureCollection with a single feature
// with no properties is returned.
print('All geometries merged into one', fc.union(1));
Python setup
See the
Python Environment page for information on the Python API and using
geemap
for interactive development.
import ee
import geemap.core as geemap
Colab (Python)
# FeatureCollection of power plants in Belgium.
fc = ee.FeatureCollection('WRI/GPPD/power_plants').filter(
'country_lg == "Belgium"')
print('Original FeatureCollection:', fc.getInfo())
# Merge all geometries into one. A FeatureCollection with a single feature
# with no properties is returned.
print('All geometries merged into one:', fc.union(1).getInfo())
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Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License , and code samples are licensed under the Apache 2.0 License . For details, see the Google Developers Site Policies . Java is a registered trademark of Oracle and/or its affiliates.
Last updated 2023-10-06 UTC.
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