AI-generated Key Takeaways
-
The
unionfunction merges all geometries in a collection into a single feature with a single geometry and an ID of 'union_result'. -
The
unionfunction returns a FeatureCollection containing this single merged feature. -
The
maxErrorargument allows specifying the maximum error for reprojections, defaulting to the output's requested error margin if not provided.
| 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 ));
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"' ) display ( 'Original FeatureCollection:' , fc ) # Merge all geometries into one. A FeatureCollection with a single feature # with no properties is returned. display ( 'All geometries merged into one:' , fc . union ( 1 ))
