ee.Geometry.LineString.perimeter

  • Calculates the total length of all sides of a polygon or the length of a line.

  • Applicable to LineString geometries and returns the result as a float.

  • Allows specifying maxError for reprojection and proj for the desired unit of the output.

  • Returns the perimeter in meters by default if the projection is not specified.

 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
LineString.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 LineString object.
var lineString = ee.Geometry.LineString([[-122.09, 37.42], [-122.08, 37.43]]);

// Apply the perimeter method to the LineString object.
var lineStringPerimeter = lineString.perimeter({'maxError': 1});

// Print the result to the console.
print('lineString.perimeter(...) =', lineStringPerimeter);

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

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 LineString object.
linestring = ee.Geometry.LineString([[-122.09, 37.42], [-122.08, 37.43]])

# Apply the perimeter method to the LineString object.
linestring_perimeter = linestring.perimeter(maxError=1)

# Print the result.
display('linestring.perimeter(...) =', linestring_perimeter)

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