ee.Geometry.BBox.union

  • Returns a Geometry representing the union of two geometries.

  • Accepts a right operand Geometry, an optional maximum error margin, and an optional projection for the operation.

  • Can be performed in a spherical coordinate system with distances in meters on the sphere if no projection is specified.

  • Illustrated with JavaScript and Python examples demonstrating its usage with BBox geometries.

 Returns the union of the two geometries.

UsageReturns
BBox.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 BBox object.
var bBox = ee.Geometry.BBox(-122.09, 37.42, -122.08, 37.43);

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

// Apply the union method to the BBox object.
var bBoxUnion = bBox.union({'right': inputGeom, 'maxError': 1});

// Print the result to the console.
print('bBox.union(...) =', bBoxUnion);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(bBox,
             {'color': 'black'},
             'Geometry [black]: bBox');
Map.addLayer(inputGeom,
             {'color': 'blue'},
             'Parameter [blue]: inputGeom');
Map.addLayer(bBoxUnion,
             {'color': 'red'},
             'Result [red]: bBox.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 BBox object.
bbox = ee.Geometry.BBox(-122.09, 37.42, -122.08, 37.43)

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

# Apply the union method to the BBox object.
bbox_union = bbox.union(right=input_geom, maxError=1)

# Print the result.
display('bbox.union(...) =', bbox_union)

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