AI-generated Key Takeaways
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The buffer method returns a new geometry by expanding or contracting the input geometry based on a given distance.
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A positive distance expands the geometry, while a negative distance contracts it.
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The method can take optional arguments for maximum error tolerance and a projection for distance interpretation.
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The result is a Geometry object.
Usage | Returns |
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MultiPolygon.buffer(distance, maxError, proj) | Geometry |
Argument | Type | Details |
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this: geometry | Geometry | The geometry being buffered. |
distance | Float | The distance of the buffering, which may be negative. If no projection is specified, the unit is meters. Otherwise the unit is in the coordinate system of the projection. |
maxError | ErrorMargin, default: null | The maximum amount of error tolerated when approximating the buffering circle and performing any necessary reprojection. If unspecified, defaults to 1% of the distance. |
proj | Projection, default: null | If specified, the buffering will be performed in this projection and the distance will be interpreted as units of the coordinate system of this projection. Otherwise the distance is interpereted as meters and the buffering is performed in a spherical coordinate system. |
Examples
Code Editor (JavaScript)
// Define a MultiPolygon object. var multiPolygon = ee.Geometry.MultiPolygon( [[[[-122.092, 37.424], [-122.086, 37.418], [-122.079, 37.425], [-122.085, 37.423]]], [[[-122.081, 37.417], [-122.086, 37.421], [-122.089, 37.416]]]]); // Apply the buffer method to the MultiPolygon object. var multiPolygonBuffer = multiPolygon.buffer({'distance': 100}); // Print the result to the console. print('multiPolygon.buffer(...) =', multiPolygonBuffer); // Display relevant geometries on the map. Map.setCenter(-122.085, 37.422, 15); Map.addLayer(multiPolygon, {'color': 'black'}, 'Geometry [black]: multiPolygon'); Map.addLayer(multiPolygonBuffer, {'color': 'red'}, 'Result [red]: multiPolygon.buffer');
import ee import geemap.core as geemap
Colab (Python)
# Define a MultiPolygon object. multipolygon = ee.Geometry.MultiPolygon([ [[ [-122.092, 37.424], [-122.086, 37.418], [-122.079, 37.425], [-122.085, 37.423], ]], [[[-122.081, 37.417], [-122.086, 37.421], [-122.089, 37.416]]], ]) # Apply the buffer method to the MultiPolygon object. multipolygon_buffer = multipolygon.buffer(distance=100) # Print the result. display('multipolygon.buffer(...) =', multipolygon_buffer) # Display relevant geometries on the map. m = geemap.Map() m.set_center(-122.085, 37.422, 15) m.add_layer( multipolygon, {'color': 'black'}, 'Geometry [black]: multipolygon' ) m.add_layer( multipolygon_buffer, {'color': 'red'}, 'Result [red]: multipolygon.buffer' ) m