AI-generated Key Takeaways
-
The
simplifymethod simplifies geometry within a specified error margin. -
This method overrides the default Earth Engine error propagation policy, ensuring consistent rendering across zoom levels but potentially impacting performance at lower zoom levels.
-
The method takes arguments for the maximum error allowed (
maxError) and an optional projection (proj). -
Examples are provided for using
simplifywith JavaScript and Python.
This overrides the default Earth Engine policy for propagating error margins, so regardless of the geometry accuracy requested from the output, the inputs will be requested with the error margin specified in the arguments to this algorithm. This results in consistent rendering at all zoom levels of a rendered vector map, but at lower zoom levels (i.e. zoomed out), the geometry won't be simplified, which may harm performance.
| Usage | Returns |
|---|---|
MultiPoint.
simplify
(maxError, proj
)
|
Geometry |
| Argument | Type | Details |
|---|---|---|
|
this:
geometry
|
Geometry | The geometry to simplify. |
maxError
|
ErrorMargin | The maximum amount of error by which the result may differ from the input. |
proj
|
Projection, default: null | If specified, the result will be in this projection. Otherwise it will be in the same projection as the input. If the error margin is in projected units, the margin will be interpreted as units of this projection. |
Examples
Code Editor (JavaScript)
// Define a MultiPoint object. var multiPoint = ee . Geometry . MultiPoint ([[ - 122.082 , 37.420 ], [ - 122.081 , 37.426 ]]); // Apply the simplify method to the MultiPoint object. var multiPointSimplify = multiPoint . simplify ({ 'maxError' : 1 }); // Print the result to the console. print ( 'multiPoint.simplify(...) =' , multiPointSimplify ); // Display relevant geometries on the map. Map . setCenter ( - 122.085 , 37.422 , 15 ); Map . addLayer ( multiPoint , { 'color' : 'black' }, 'Geometry [black]: multiPoint' ); Map . addLayer ( multiPointSimplify , { 'color' : 'red' }, 'Result [red]: multiPoint.simplify' );
import ee import geemap.core as geemap
Colab (Python)
# Define a MultiPoint object. multipoint = ee . Geometry . MultiPoint ([[ - 122.082 , 37.420 ], [ - 122.081 , 37.426 ]]) # Apply the simplify method to the MultiPoint object. multipoint_simplify = multipoint . simplify ( maxError = 1 ) # Print the result. display ( 'multipoint.simplify(...) =' , multipoint_simplify ) # Display relevant geometries on the map. m = geemap . Map () m . set_center ( - 122.085 , 37.422 , 15 ) m . add_layer ( multipoint , { 'color' : 'black' }, 'Geometry [black]: multipoint' ) m . add_layer ( multipoint_simplify , { 'color' : 'red' }, 'Result [red]: multipoint.simplify' ) m
