AI-generated Key Takeaways
-
union
returns a Geometry representing the combined area of two input geometries. -
This method can be applied to Point objects and accepts a second Geometry, an optional error margin (
maxError
), and an optional projection (proj
) as input. -
If a projection is not specified, calculations are performed in a spherical coordinate system using meters as the unit of distance.
-
The result of the union operation represents the total area covered by both input geometries.
Usage | Returns |
---|---|
Point.union(right, maxError, proj) | Geometry |
Argument | Type | Details |
---|---|---|
this: left | Geometry | The geometry used as the left operand of the operation. |
right | Geometry | The geometry used as the right operand of the operation. |
maxError | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |
proj | Projection, default: null | The projection in which to perform the operation. If not specified, the operation will be performed in a spherical coordinate system, and linear distances will be in meters on the sphere. |
Examples
Code Editor (JavaScript)
// Define a Point object. var point = ee.Geometry.Point(-122.082, 37.42); // Define other inputs. var inputGeom = ee.Geometry.BBox(-122.085, 37.415, -122.075, 37.425); // Apply the union method to the Point object. var pointUnion = point.union({'right': inputGeom, 'maxError': 1}); // Print the result to the console. print('point.union(...) =', pointUnion); // Display relevant geometries on the map. Map.setCenter(-122.085, 37.422, 15); Map.addLayer(point, {'color': 'black'}, 'Geometry [black]: point'); Map.addLayer(inputGeom, {'color': 'blue'}, 'Parameter [blue]: inputGeom'); Map.addLayer(pointUnion, {'color': 'red'}, 'Result [red]: point.union');
import ee import geemap.core as geemap
Colab (Python)
# Define a Point object. point = ee.Geometry.Point(-122.082, 37.42) # Define other inputs. input_geom = ee.Geometry.BBox(-122.085, 37.415, -122.075, 37.425) # Apply the union method to the Point object. point_union = point.union(right=input_geom, maxError=1) # Print the result. display('point.union(...) =', point_union) # Display relevant geometries on the map. m = geemap.Map() m.set_center(-122.085, 37.422, 15) m.add_layer(point, {'color': 'black'}, 'Geometry [black]: point') m.add_layer(input_geom, {'color': 'blue'}, 'Parameter [blue]: input_geom') m.add_layer(point_union, {'color': 'red'}, 'Result [red]: point.union') m