AI-generated Key Takeaways
-
The
perimetermethod returns the length of the perimeter of the polygonal parts of a geometry. -
For multi geometries, the perimeter is the sum of the perimeters of their components.
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The method can take
maxErrorandprojarguments to control reprojection and output units. -
The result is a floating-point number representing the perimeter length.
| Usage | Returns |
|---|---|
MultiLineString.perimeter(maxError, proj) | Float |
| Argument | Type | Details |
|---|---|---|
this: geometry | Geometry | The input geometry. |
maxError | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |
proj | Projection, default: null | If specified, the result will be in the units of the coordinate system of this projection. Otherwise it will be in meters. |
Examples
Code Editor (JavaScript)
// Define a MultiLineString object. var multiLineString = ee.Geometry.MultiLineString( [[[-122.088, 37.418], [-122.086, 37.422], [-122.082, 37.418]], [[-122.087, 37.416], [-122.083, 37.416], [-122.082, 37.419]]]); // Apply the perimeter method to the MultiLineString object. var multiLineStringPerimeter = multiLineString.perimeter({'maxError': 1}); // Print the result to the console. print('multiLineString.perimeter(...) =', multiLineStringPerimeter); // Display relevant geometries on the map. Map.setCenter(-122.085, 37.422, 15); Map.addLayer(multiLineString, {'color': 'black'}, 'Geometry [black]: multiLineString');
import ee import geemap.core as geemap
Colab (Python)
# Define a MultiLineString object. multilinestring = ee.Geometry.MultiLineString([ [[-122.088, 37.418], [-122.086, 37.422], [-122.082, 37.418]], [[-122.087, 37.416], [-122.083, 37.416], [-122.082, 37.419]], ]) # Apply the perimeter method to the MultiLineString object. multilinestring_perimeter = multilinestring.perimeter(maxError=1) # Print the result. display('multilinestring.perimeter(...) =', multilinestring_perimeter) # Display relevant geometries on the map. m = geemap.Map() m.set_center(-122.085, 37.422, 15) m.add_layer( multilinestring, {'color': 'black'}, 'Geometry [black]: multilinestring' ) m