AI-generated Key Takeaways
-
The
area()
method calculates the area of a geometry, returning 0 for points and lines and the sum of areas for multi-geometries. -
By default, the area is calculated in square meters, but an optional projection can be specified to get the area in the units of that projection's coordinate system.
-
maxError
is an optional argument that specifies the maximum allowable error for reprojection. -
The example code demonstrates using
area()
on aRectangle
geometry in both JavaScript and Python.
Usage | Returns |
---|---|
Rectangle.area(maxError, proj) | Float |
Argument | Type | Details |
---|---|---|
this: geometry | Geometry | The geometry input. |
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 square meters. |
Examples
Code Editor (JavaScript)
// Define a Rectangle object. var rectangle = ee.Geometry.Rectangle(-122.09, 37.42, -122.08, 37.43); // Apply the area method to the Rectangle object. var rectangleArea = rectangle.area({'maxError': 1}); // Print the result to the console. print('rectangle.area(...) =', rectangleArea); // Display relevant geometries on the map. Map.setCenter(-122.085, 37.422, 15); Map.addLayer(rectangle, {'color': 'black'}, 'Geometry [black]: rectangle');
import ee import geemap.core as geemap
Colab (Python)
# Define a Rectangle object. rectangle = ee.Geometry.Rectangle(-122.09, 37.42, -122.08, 37.43) # Apply the area method to the Rectangle object. rectangle_area = rectangle.area(maxError=1) # Print the result. display('rectangle.area(...) =', rectangle_area) # Display relevant geometries on the map. m = geemap.Map() m.set_center(-122.085, 37.422, 15) m.add_layer(rectangle, {'color': 'black'}, 'Geometry [black]: rectangle') m