AI-generated Key Takeaways
-
The
simplifymethod simplifies geometry within a specified error margin, overriding default Earth Engine error propagation policies unlessmaxErroris explicitly null. -
This simplification can lead to consistent rendering at all zoom levels but may negatively impact performance at lower zoom levels where geometry is not simplified.
-
The method takes
maxError(anErrorMargin) and an optionalproj(aProjection) as arguments.
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 |
|---|---|
Point.
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 Point object. var point = ee . Geometry . Point ( - 122.082 , 37.42 ); // Apply the simplify method to the Point object. var pointSimplify = point . simplify ({ 'maxError' : 1 }); // Print the result to the console. print ( 'point.simplify(...) =' , pointSimplify ); // Display relevant geometries on the map. Map . setCenter ( - 122.085 , 37.422 , 15 ); Map . addLayer ( point , { 'color' : 'black' }, 'Geometry [black]: point' ); Map . addLayer ( pointSimplify , { 'color' : 'red' }, 'Result [red]: point.simplify' );
import ee import geemap.core as geemap
Colab (Python)
# Define a Point object. point = ee . Geometry . Point ( - 122.082 , 37.42 ) # Apply the simplify method to the Point object. point_simplify = point . simplify ( maxError = 1 ) # Print the result. display ( 'point.simplify(...) =' , point_simplify ) # Display relevant geometries on the map. m = geemap . Map () m . set_center ( - 122.085 , 37.422 , 15 ) m . add_layer ( point , { 'color' : 'black' }, 'Geometry [black]: point' ) m . add_layer ( point_simplify , { 'color' : 'red' }, 'Result [red]: point.simplify' ) m
