ee.Geometry.MultiPolygon.perimeter

Page Summary

• The perimeter method 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 optional arguments for maximum error tolerance and projection.

• The result is returned as a Float value.

Returns the length of the perimeter of the polygonal parts of the geometry. The perimeter of multi geometries is the sum of the perimeters of their components.

Usage	Returns
MultiPolygon.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 MultiPolygon object.
var multiPolygon = ee.Geometry.MultiPolygon(
    [[[[-122.092, 37.424],
       [-122.086, 37.418],
       [-122.079, 37.425],
       [-122.085, 37.423]]],
     [[[-122.081, 37.417],
       [-122.086, 37.421],
       [-122.089, 37.416]]]]);

// Apply the perimeter method to the MultiPolygon object.
var multiPolygonPerimeter = multiPolygon.perimeter({'maxError': 1});

// Print the result to the console.
print('multiPolygon.perimeter(...) =', multiPolygonPerimeter);

// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(multiPolygon,
             {'color': 'black'},
             'Geometry [black]: multiPolygon');

Python setup

See the Python Environment page for information on the Python API and using geemap for interactive development.

import ee
import geemap.core as geemap

Colab (Python)

# Define a MultiPolygon object.
multipolygon = ee.Geometry.MultiPolygon([
    [[
        [-122.092, 37.424],
        [-122.086, 37.418],
        [-122.079, 37.425],
        [-122.085, 37.423],
    ]],
    [[[-122.081, 37.417], [-122.086, 37.421], [-122.089, 37.416]]],
])

# Apply the perimeter method to the MultiPolygon object.
multipolygon_perimeter = multipolygon.perimeter(maxError=1)

# Print the result.
display('multipolygon.perimeter(...) =', multipolygon_perimeter)

# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(
    multipolygon, {'color': 'black'}, 'Geometry [black]: multipolygon'
)
m