AI-generated Key Takeaways
-
The
unionmethod returns the union of two geometries. -
It takes a right geometry as the second operand, and optional
maxErrorandprojarguments. -
The method is available for
LineStringobjects and returns aGeometryobject.
| Usage | Returns |
|---|---|
LineString.
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 LineString object. var lineString = ee . Geometry . LineString ([[ - 122.09 , 37.42 ], [ - 122.08 , 37.43 ]]); // Define other inputs. var inputGeom = ee . Geometry . BBox ( - 122.085 , 37.415 , - 122.075 , 37.425 ); // Apply the union method to the LineString object. var lineStringUnion = lineString . union ({ 'right' : inputGeom , 'maxError' : 1 }); // Print the result to the console. print ( 'lineString.union(...) =' , lineStringUnion ); // Display relevant geometries on the map. Map . setCenter ( - 122.085 , 37.422 , 15 ); Map . addLayer ( lineString , { 'color' : 'black' }, 'Geometry [black]: lineString' ); Map . addLayer ( inputGeom , { 'color' : 'blue' }, 'Parameter [blue]: inputGeom' ); Map . addLayer ( lineStringUnion , { 'color' : 'red' }, 'Result [red]: lineString.union' );
import ee import geemap.core as geemap
Colab (Python)
# Define a LineString object. linestring = ee . Geometry . LineString ([[ - 122.09 , 37.42 ], [ - 122.08 , 37.43 ]]) # Define other inputs. input_geom = ee . Geometry . BBox ( - 122.085 , 37.415 , - 122.075 , 37.425 ) # Apply the union method to the LineString object. linestring_union = linestring . union ( right = input_geom , maxError = 1 ) # Print the result. display ( 'linestring.union(...) =' , linestring_union ) # Display relevant geometries on the map. m = geemap . Map () m . set_center ( - 122.085 , 37.422 , 15 ) m . add_layer ( linestring , { 'color' : 'black' }, 'Geometry [black]: linestring' ) m . add_layer ( input_geom , { 'color' : 'blue' }, 'Parameter [blue]: input_geom' ) m . add_layer ( linestring_union , { 'color' : 'red' }, 'Result [red]: linestring.union' ) m
