ee.Geometry.perimeter

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 maxError and proj arguments to specify the maximum tolerated error for reprojection and the desired output projection, respectively.

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
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');

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 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