ee.Geometry.MultiPolygon.perimeter

  • Calculates the total length of all the outer edges of a MultiPolygon geometry.

  • The perimeter of a MultiPolygon is the sum of the perimeters of all its individual polygons.

  • Accepts optional parameters for projection and error tolerance during calculations.

  • Returns the perimeter value as a float, representing the total distance in meters or the specified projection's units.

 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.

UsageReturns
MultiPolygon.perimeter(maxError, proj)Float
ArgumentTypeDetails
this: geometryGeometryThe input geometry.
maxErrorErrorMargin, default: nullThe maximum amount of error tolerated when performing any necessary reprojection.
projProjection, default: nullIf 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