ee.Geometry.BBox.dissolve

  • The dissolve() method returns the union of a geometry, which is useful for combining multiple geometries into a single one.

  • It can be applied to both single and multi-geometries, leaving single geometries unchanged.

  • dissolve() accepts optional maxError and proj parameters to control reprojection during the union process.

  • This method is particularly valuable for simplifying complex geometries or creating continuous boundaries from fragmented shapes.

 Returns the union of the geometry. This leaves single geometries untouched, and unions multi geometries.

UsageReturns
BBox.dissolve(maxError, proj)Geometry
ArgumentTypeDetails
this: geometryGeometryThe geometry to union.
maxErrorErrorMargin, default: nullThe maximum amount of error tolerated when performing any necessary reprojection.
projProjection, default: nullIf specified, the union will be performed in this projection. Otherwise it will be performed in a spherical coordinate system.

Examples

Code Editor (JavaScript)

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

// Apply the dissolve method to the BBox object.
var bBoxDissolve = bBox.dissolve({'maxError': 1});

// Print the result to the console.
print('bBox.dissolve(...) =', bBoxDissolve);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(bBox,
             {'color': 'black'},
             'Geometry [black]: bBox');
Map.addLayer(bBoxDissolve,
             {'color': 'red'},
             'Result [red]: bBox.dissolve');

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)

# Apply the dissolve method to the BBox object.
bbox_dissolve = bbox.dissolve(maxError=1)

# Print the result.
display('bbox.dissolve(...) =', bbox_dissolve)

# 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(bbox_dissolve, {'color': 'red'}, 'Result [red]: bbox.dissolve')
m