ee.Geometry.LinearRing.simplify

  • This method simplifies geometry within a specified error margin, but does not automatically respect the consumer's requested error margin unless maxError is null.

  • It overrides the default Earth Engine error propagation policy, ensuring consistent rendering at all zoom levels by requesting inputs with the specified error margin.

  • While this results in consistent rendering, geometry won't be simplified at lower zoom levels, which could impact performance.

  • The method takes maxError (ErrorMargin) and an optional proj (Projection) as arguments and returns a simplified Geometry.

 Simplifies the geometry to within a given error margin. Note that this does not respect the error margin requested by the consumer of this algorithm, unless maxError is explicitly specified to be null.

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.

UsageReturns
LinearRing.simplify(maxError, proj)Geometry
ArgumentTypeDetails
this: geometryGeometryThe geometry to simplify.
maxErrorErrorMarginThe maximum amount of error by which the result may differ from the input.
projProjection, default: nullIf 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 LinearRing object.
var linearRing = ee.Geometry.LinearRing(
    [[-122.091, 37.420],
     [-122.085, 37.422],
     [-122.080, 37.430]]);

// Apply the simplify method to the LinearRing object.
var linearRingSimplify = linearRing.simplify({'maxError': 1});

// Print the result to the console.
print('linearRing.simplify(...) =', linearRingSimplify);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(linearRing,
             {'color': 'black'},
             'Geometry [black]: linearRing');
Map.addLayer(linearRingSimplify,
             {'color': 'red'},
             'Result [red]: linearRing.simplify');

Python setup

See the Python Environment page for information on the Python API and using geemap for interactive development.

import ee
import geemap.core as geemap

Colab (Python)

# Define a LinearRing object.
linearring = ee.Geometry.LinearRing(
    [[-122.091, 37.420], [-122.085, 37.422], [-122.080, 37.430]]
)

# Apply the simplify method to the LinearRing object.
linearring_simplify = linearring.simplify(maxError=1)

# Print the result.
display('linearring.simplify(...) =', linearring_simplify)

# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(linearring, {'color': 'black'}, 'Geometry [black]: linearring')
m.add_layer(
    linearring_simplify, {'color': 'red'}, 'Result [red]: linearring.simplify'
)
m