ee.Geometry.BBox.union

  • The BBox.union() method returns the union of two geometries.

  • The method takes two required geometry arguments, left and right, along with optional maxError and proj arguments.

  • The left geometry is the BBox object on which the method is called, and right is the other geometry for the union operation.

 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