ee.Geometry.Rectangle.perimeter

  • perimeter() calculates the total length of the outside edges of a geometry, like a rectangle or polygon.

  • For complex shapes with multiple parts, it adds up the perimeter of each individual part.

  • You can choose to get the perimeter in meters or in the units of a specific map projection.

  • An optional maxError parameter controls the accuracy of calculations, especially during projection.

 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
Rectangle.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 Rectangle object.
var rectangle = ee.Geometry.Rectangle(-122.09, 37.42, -122.08, 37.43);

// Apply the perimeter method to the Rectangle object.
var rectanglePerimeter = rectangle.perimeter({'maxError': 1});

// Print the result to the console.
print('rectangle.perimeter(...) =', rectanglePerimeter);

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

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 Rectangle object.
rectangle = ee.Geometry.Rectangle(-122.09, 37.42, -122.08, 37.43)

# Apply the perimeter method to the Rectangle object.
rectangle_perimeter = rectangle.perimeter(maxError=1)

# Print the result.
display('rectangle.perimeter(...) =', rectangle_perimeter)

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