AI-generated Key Takeaways
-
The
areamethod returns the area of a geometry. -
The area of points and line strings is 0, and the area of multi geometries is the sum of the areas of their components.
-
The method can accept optional
maxErrorandprojarguments to specify the error tolerance and projection for the calculation. -
The result of the
areamethod is a Float. -
The examples show how to use the
areamethod on aPolygonobject in both JavaScript and Python.
| Usage | Returns |
|---|---|
Polygon.
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 Polygon object. var polygon = ee . Geometry . Polygon ( [[[ - 122.092 , 37.424 ], [ - 122.086 , 37.418 ], [ - 122.079 , 37.425 ], [ - 122.085 , 37.423 ]]]); // Apply the area method to the Polygon object. var polygonArea = polygon . area ({ 'maxError' : 1 }); // Print the result to the console. print ( 'polygon.area(...) =' , polygonArea ); // Display relevant geometries on the map. Map . setCenter ( - 122.085 , 37.422 , 15 ); Map . addLayer ( polygon , { 'color' : 'black' }, 'Geometry [black]: polygon' );
import ee import geemap.core as geemap
Colab (Python)
# Define a Polygon object. polygon = ee . Geometry . Polygon ([[ [ - 122.092 , 37.424 ], [ - 122.086 , 37.418 ], [ - 122.079 , 37.425 ], [ - 122.085 , 37.423 ], ]]) # Apply the area method to the Polygon object. polygon_area = polygon . area ( maxError = 1 ) # Print the result. display ( 'polygon.area(...) =' , polygon_area ) # Display relevant geometries on the map. m = geemap . Map () m . set_center ( - 122.085 , 37.422 , 15 ) m . add_layer ( polygon , { 'color' : 'black' }, 'Geometry [black]: polygon' ) m
