AI-generated Key Takeaways
-
The
Geometry.perimeter()method returns the length of the perimeter for the polygonal parts of a geometry. -
For multi-geometries, the method returns the sum of the perimeters of their individual components.
-
The method can take optional
maxErrorandprojarguments to specify the maximum tolerated error for reprojection and the desired output projection, respectively.
| Usage | Returns |
|---|---|
Geometry.
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 Geometry object. var geometry = ee . Geometry ({ 'type' : 'Polygon' , 'coordinates' : [[[ - 122.081 , 37.417 ], [ - 122.086 , 37.421 ], [ - 122.084 , 37.418 ], [ - 122.089 , 37.416 ]]] }); // Apply the perimeter method to the Geometry object. var geometryPerimeter = geometry . perimeter ({ 'maxError' : 1 }); // Print the result to the console. print ( 'geometry.perimeter(...) =' , geometryPerimeter ); // Display relevant geometries on the map. Map . setCenter ( - 122.085 , 37.422 , 15 ); Map . addLayer ( geometry , { 'color' : 'black' }, 'Geometry [black]: geometry' );
import ee import geemap.core as geemap
Colab (Python)
# Define a Geometry object. geometry = ee . Geometry ({ 'type' : 'Polygon' , 'coordinates' : [[ [ - 122.081 , 37.417 ], [ - 122.086 , 37.421 ], [ - 122.084 , 37.418 ], [ - 122.089 , 37.416 ], ]], }) # Apply the perimeter method to the Geometry object. geometry_perimeter = geometry . perimeter ( maxError = 1 ) # Print the result. display ( 'geometry.perimeter(...) =' , geometry_perimeter ) # Display relevant geometries on the map. m = geemap . Map () m . set_center ( - 122.085 , 37.422 , 15 ) m . add_layer ( geometry , { 'color' : 'black' }, 'Geometry [black]: geometry' ) m
