ee.Geometry.MultiPoint.union

  • The union method returns the union of two geometries.

  • The union method takes two required arguments, left and right, which are the geometries used in the union operation.

  • Optional arguments for the union method include maxError and proj.

  • The examples demonstrate how to use the union method in both JavaScript and Python, including defining inputs, applying the method, and displaying the results.

 Returns the union of the two geometries.

UsageReturns
MultiPoint.union(right, maxError, proj)Geometry
ArgumentTypeDetails
this: leftGeometryThe geometry used as the left operand of the operation.
rightGeometryThe geometry used as the right operand of the operation.
maxErrorErrorMargin, default: nullThe maximum amount of error tolerated when performing any necessary reprojection.
projProjection, default: nullThe 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 MultiPoint object.
var multiPoint = ee.Geometry.MultiPoint([[-122.082, 37.420], [-122.081, 37.426]]);

// Define other inputs.
var inputGeom = ee.Geometry.BBox(-122.085, 37.415, -122.075, 37.425);

// Apply the union method to the MultiPoint object.
var multiPointUnion = multiPoint.union({'right': inputGeom, 'maxError': 1});

// Print the result to the console.
print('multiPoint.union(...) =', multiPointUnion);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(multiPoint,
             {'color': 'black'},
             'Geometry [black]: multiPoint');
Map.addLayer(inputGeom,
             {'color': 'blue'},
             'Parameter [blue]: inputGeom');
Map.addLayer(multiPointUnion,
             {'color': 'red'},
             'Result [red]: multiPoint.union');

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)

# Define a MultiPoint object.
multipoint = ee.Geometry.MultiPoint([[-122.082, 37.420], [-122.081, 37.426]])

# Define other inputs.
input_geom = ee.Geometry.BBox(-122.085, 37.415, -122.075, 37.425)

# Apply the union method to the MultiPoint object.
multipoint_union = multipoint.union(right=input_geom, maxError=1)

# Print the result.
display('multipoint.union(...) =', multipoint_union)

# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(multipoint, {'color': 'black'}, 'Geometry [black]: multipoint')
m.add_layer(input_geom, {'color': 'blue'}, 'Parameter [blue]: input_geom')
m.add_layer(
    multipoint_union, {'color': 'red'}, 'Result [red]: multipoint.union'
)
m