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ee.Geometry.Polygon.difference

  • Thedifference method returns the result of subtracting the 'right' geometry from the 'left' geometry.

  • Thedifference method takes 'right' (Geometry), optional 'maxError' (ErrorMargin), and optional 'proj' (Projection) as arguments and returns a Geometry.

  • Example code is provided in both JavaScript and Python to demonstrate the usage of thedifference method with a Polygon.

 Returns the result of subtracting the 'right' geometry from the 'left' geometry.

UsageReturns
Polygon.difference(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 Polygon object.varpolygon=ee.Geometry.Polygon([[[-122.092,37.424],[-122.086,37.418],[-122.079,37.425],[-122.085,37.423]]]);// Define other inputs.varinputGeom=ee.Geometry.BBox(-122.085,37.415,-122.075,37.425);// Apply the difference method to the Polygon object.varpolygonDifference=polygon.difference({'right':inputGeom,'maxError':1});// Print the result to the console.print('polygon.difference(...) =',polygonDifference);// Display relevant geometries on the map.Map.setCenter(-122.085,37.422,15);Map.addLayer(polygon,{'color':'black'},'Geometry [black]: polygon');Map.addLayer(inputGeom,{'color':'blue'},'Parameter [blue]: inputGeom');Map.addLayer(polygonDifference,{'color':'red'},'Result [red]: polygon.difference');

Python setup

See the Python Environment page for information on the Python API and usinggeemap for interactive development.

importeeimportgeemap.coreasgeemap

Colab (Python)

# Define a Polygon object.polygon=ee.Geometry.Polygon([[[-122.092,37.424],[-122.086,37.418],[-122.079,37.425],[-122.085,37.423],]])# Define other inputs.input_geom=ee.Geometry.BBox(-122.085,37.415,-122.075,37.425)# Apply the difference method to the Polygon object.polygon_difference=polygon.difference(right=input_geom,maxError=1)# Print the result.display('polygon.difference(...) =',polygon_difference)# Display relevant geometries on the map.m=geemap.Map()m.set_center(-122.085,37.422,15)m.add_layer(polygon,{'color':'black'},'Geometry [black]: polygon')m.add_layer(input_geom,{'color':'blue'},'Parameter [blue]: input_geom')m.add_layer(polygon_difference,{'color':'red'},'Result [red]: polygon.difference')m

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Last updated 2023-10-06 UTC.