ee.Geometry.Rectangle.dissolve

  • dissolve() returns the geometric union of the input geometry, primarily useful for merging MultiGeometries into single geometries.

  • It accepts optional maxError and proj parameters for controlling reprojection during the union process.

  • When applied to single geometries like Rectangles, dissolve() typically returns the original geometry unchanged.

  • This method is valuable for simplifying complex geometries by combining their constituent parts.

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

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

// Apply the dissolve method to the Rectangle object.
var rectangleDissolve = rectangle.dissolve({'maxError': 1});

// Print the result to the console.
print('rectangle.dissolve(...) =', rectangleDissolve);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(rectangle,
             {'color': 'black'},
             'Geometry [black]: rectangle');
Map.addLayer(rectangleDissolve,
             {'color': 'red'},
             'Result [red]: rectangle.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 Rectangle object.
rectangle = ee.Geometry.Rectangle(-122.09, 37.42, -122.08, 37.43)

# Apply the dissolve method to the Rectangle object.
rectangle_dissolve = rectangle.dissolve(maxError=1)

# Print the result.
display('rectangle.dissolve(...) =', rectangle_dissolve)

# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(rectangle, {'color': 'black'}, 'Geometry [black]: rectangle')
m.add_layer(
    rectangle_dissolve, {'color': 'red'}, 'Result [red]: rectangle.dissolve'
)
m