ee.Geometry.LineString.simplify

  • Simplifies geometry, potentially ignoring user-specified error margins unless maxError is explicitly defined.

  • Uses a consistent error margin for rendering at all zoom levels, potentially impacting performance at lower zoom levels due to lack of simplification.

  • simplify() takes maxError and an optional projection (proj) as arguments to control the simplification process.

  • The simplification process can result in a geometry that differs from the original by a maximum of maxError.

 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
LineString.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 LineString object.
var lineString = ee.Geometry.LineString([[-122.09, 37.42], [-122.08, 37.43]]);

// Apply the simplify method to the LineString object.
var lineStringSimplify = lineString.simplify({'maxError': 1});

// Print the result to the console.
print('lineString.simplify(...) =', lineStringSimplify);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(lineString,
             {'color': 'black'},
             'Geometry [black]: lineString');
Map.addLayer(lineStringSimplify,
             {'color': 'red'},
             'Result [red]: lineString.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 LineString object.
linestring = ee.Geometry.LineString([[-122.09, 37.42], [-122.08, 37.43]])

# Apply the simplify method to the LineString object.
linestring_simplify = linestring.simplify(maxError=1)

# Print the result.
display('linestring.simplify(...) =', linestring_simplify)

# 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(
    linestring_simplify, {'color': 'red'}, 'Result [red]: linestring.simplify'
)
m