AI-generated Key Takeaways
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The buffer method returns the input geometry buffered by a given distance, expanding it if the distance is positive and contracting it if negative.
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This method can be applied to a LineString and returns a Geometry.
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Key arguments include
distance
(float),maxError
(ErrorMargin), andproj
(Projection), which influence the buffering operation and distance interpretation. -
Examples in both JavaScript and Python demonstrate how to use the
buffer
method with a LineString and display the results.
Usage | Returns |
---|---|
LineString.buffer(distance, maxError, proj) | Geometry |
Argument | Type | Details |
---|---|---|
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 LineString object. var lineString = ee.Geometry.LineString([[-122.09, 37.42], [-122.08, 37.43]]); // Apply the buffer method to the LineString object. var lineStringBuffer = lineString.buffer({'distance': 100}); // Print the result to the console. print('lineString.buffer(...) =', lineStringBuffer); // Display relevant geometries on the map. Map.setCenter(-122.085, 37.422, 15); Map.addLayer(lineString, {'color': 'black'}, 'Geometry [black]: lineString'); Map.addLayer(lineStringBuffer, {'color': 'red'}, 'Result [red]: lineString.buffer');
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 buffer method to the LineString object. linestring_buffer = linestring.buffer(distance=100) # Print the result. display('linestring.buffer(...) =', linestring_buffer) # 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_buffer, {'color': 'red'}, 'Result [red]: linestring.buffer' ) m