AI-generated Key Takeaways
-
The
differencemethod returns the result of subtracting the 'right' geometry from the 'left' geometry. -
It takes the
rightgeometry, optionalmaxError, and optionalprojarguments and returns a Geometry. -
The
maxErrorargument sets the maximum tolerated error during reprojection, whileprojspecifies the projection for the operation. -
Examples are provided in JavaScript and Python to demonstrate its usage.
| Usage | Returns |
|---|---|
Geometry.
difference
(right, maxError
, proj
)
|
Geometry |
| Argument | Type | Details |
|---|---|---|
|
this:
left
|
Geometry | The geometry used as the left operand of the operation. |
right
|
Geometry | The geometry used as the right operand of the operation. |
maxError
|
ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |
proj
|
Projection, default: null | The 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 Geometry object. var geometry = ee . Geometry ({ 'type' : 'Polygon' , 'coordinates' : [[[ - 122.081 , 37.417 ], [ - 122.086 , 37.421 ], [ - 122.084 , 37.418 ], [ - 122.089 , 37.416 ]]] }); // Define other inputs. var inputGeom = ee . Geometry . BBox ( - 122.085 , 37.415 , - 122.075 , 37.425 ); // Apply the difference method to the Geometry object. var geometryDifference = geometry . difference ({ 'right' : inputGeom , 'maxError' : 1 }); // Print the result to the console. print ( 'geometry.difference(...) =' , geometryDifference ); // Display relevant geometries on the map. Map . setCenter ( - 122.085 , 37.422 , 15 ); Map . addLayer ( geometry , { 'color' : 'black' }, 'Geometry [black]: geometry' ); Map . addLayer ( inputGeom , { 'color' : 'blue' }, 'Parameter [blue]: inputGeom' ); Map . addLayer ( geometryDifference , { 'color' : 'red' }, 'Result [red]: geometry.difference' );
import ee import geemap.core as geemap
Colab (Python)
# Define a Geometry object. geometry = ee . Geometry ({ 'type' : 'Polygon' , 'coordinates' : [[ [ - 122.081 , 37.417 ], [ - 122.086 , 37.421 ], [ - 122.084 , 37.418 ], [ - 122.089 , 37.416 ], ]], }) # Define other inputs. input_geom = ee . Geometry . BBox ( - 122.085 , 37.415 , - 122.075 , 37.425 ) # Apply the difference method to the Geometry object. geometry_difference = geometry . difference ( right = input_geom , maxError = 1 ) # Print the result. display ( 'geometry.difference(...) =' , geometry_difference ) # Display relevant geometries on the map. m = geemap . Map () m . set_center ( - 122.085 , 37.422 , 15 ) m . add_layer ( geometry , { 'color' : 'black' }, 'Geometry [black]: geometry' ) m . add_layer ( input_geom , { 'color' : 'blue' }, 'Parameter [blue]: input_geom' ) m . add_layer ( geometry_difference , { 'color' : 'red' }, 'Result [red]: geometry.difference' ) m
