AI-generated Key Takeaways
-
The
unionmethod returns the union of two geometries. -
The method takes a
rightgeometry and optionalmaxErrorandprojarguments. -
The
leftgeometry is the object theunionmethod is called on. -
The operation can be performed in a specified projection or a spherical coordinate system by default.
| Usage | Returns |
|---|---|
MultiPolygon.
union
(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 MultiPolygon object. var multiPolygon = ee . Geometry . MultiPolygon ( [[[[ - 122.092 , 37.424 ], [ - 122.086 , 37.418 ], [ - 122.079 , 37.425 ], [ - 122.085 , 37.423 ]]], [[[ - 122.081 , 37.417 ], [ - 122.086 , 37.421 ], [ - 122.089 , 37.416 ]]]]); // Define other inputs. var inputGeom = ee . Geometry . BBox ( - 122.085 , 37.415 , - 122.075 , 37.425 ); // Apply the union method to the MultiPolygon object. var multiPolygonUnion = multiPolygon . union ({ 'right' : inputGeom , 'maxError' : 1 }); // Print the result to the console. print ( 'multiPolygon.union(...) =' , multiPolygonUnion ); // Display relevant geometries on the map. Map . setCenter ( - 122.085 , 37.422 , 15 ); Map . addLayer ( multiPolygon , { 'color' : 'black' }, 'Geometry [black]: multiPolygon' ); Map . addLayer ( inputGeom , { 'color' : 'blue' }, 'Parameter [blue]: inputGeom' ); Map . addLayer ( multiPolygonUnion , { 'color' : 'red' }, 'Result [red]: multiPolygon.union' );
import ee import geemap.core as geemap
Colab (Python)
# Define a MultiPolygon object. multipolygon = ee . Geometry . MultiPolygon ([ [[ [ - 122.092 , 37.424 ], [ - 122.086 , 37.418 ], [ - 122.079 , 37.425 ], [ - 122.085 , 37.423 ], ]], [[[ - 122.081 , 37.417 ], [ - 122.086 , 37.421 ], [ - 122.089 , 37.416 ]]], ]) # Define other inputs. input_geom = ee . Geometry . BBox ( - 122.085 , 37.415 , - 122.075 , 37.425 ) # Apply the union method to the MultiPolygon object. multipolygon_union = multipolygon . union ( right = input_geom , maxError = 1 ) # Print the result. display ( 'multipolygon.union(...) =' , multipolygon_union ) # Display relevant geometries on the map. m = geemap . Map () m . set_center ( - 122.085 , 37.422 , 15 ) m . add_layer ( multipolygon , { 'color' : 'black' }, 'Geometry [black]: multipolygon' ) m . add_layer ( input_geom , { 'color' : 'blue' }, 'Parameter [blue]: input_geom' ) m . add_layer ( multipolygon_union , { 'color' : 'red' }, 'Result [red]: multipolygon.union' ) m
