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.
-
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
