ee.Geometry.LinearRing.perimeter

  • Calculates the total length of all sides (perimeter) for the polygonal parts of a geometry.

  • Works with multi-geometries by summing the perimeters of their individual components.

  • Returns the perimeter value in meters by default, or in the units of a specified projection.

  • Optionally allows for error tolerance during reprojection for increased performance.

 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
LinearRing.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 LinearRing object.
var linearRing = ee.Geometry.LinearRing(
    [[-122.091, 37.420],
     [-122.085, 37.422],
     [-122.080, 37.430]]);

// Apply the perimeter method to the LinearRing object.
var linearRingPerimeter = linearRing.perimeter({'maxError': 1});

// Print the result to the console.
print('linearRing.perimeter(...) =', linearRingPerimeter);

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

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 LinearRing object.
linearring = ee.Geometry.LinearRing(
    [[-122.091, 37.420], [-122.085, 37.422], [-122.080, 37.430]]
)

# Apply the perimeter method to the LinearRing object.
linearring_perimeter = linearring.perimeter(maxError=1)

# Print the result.
display('linearring.perimeter(...) =', linearring_perimeter)

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