ee.Geometry.Polygon.simplify

  • Simplifies geometries within a specified error margin, potentially overriding Earth Engine's default error handling.

  • The maxError argument dictates the allowed deviation of the simplified geometry from the original.

  • Using the simplify method can result in consistent rendering across zoom levels but might impact performance at lower zoom levels due to reduced simplification.

  • The optional proj argument allows specifying the projection for the simplified geometry and how the error margin is interpreted.

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
Polygon.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 Polygon object.
var polygon = ee.Geometry.Polygon(
    [[[-122.092, 37.424],
      [-122.086, 37.418],
      [-122.079, 37.425],
      [-122.085, 37.423]]]);

// Apply the simplify method to the Polygon object.
var polygonSimplify = polygon.simplify({'maxError': 1});

// Print the result to the console.
print('polygon.simplify(...) =', polygonSimplify);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(polygon,
             {'color': 'black'},
             'Geometry [black]: polygon');
Map.addLayer(polygonSimplify,
             {'color': 'red'},
             'Result [red]: polygon.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 Polygon object.
polygon = ee.Geometry.Polygon([[
    [-122.092, 37.424],
    [-122.086, 37.418],
    [-122.079, 37.425],
    [-122.085, 37.423],
]])

# Apply the simplify method to the Polygon object.
polygon_simplify = polygon.simplify(maxError=1)

# Print the result.
display('polygon.simplify(...) =', polygon_simplify)

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