Functions

import {getArea} from 'ol/sphere';
Get the spherical area of a geometry. This is the area (in meters) assuming that polygon edges are segments of great circles on a sphere.
Name Type Description geometry
Geometry A geometry.
options
Options for the area calculation. By default, geometries are assumed to be in 'EPSG:3857'. You can change this by providing a
projection
option.Name Type Description projection
ProjectionLike (defaults to 'EPSG:3857') Projection of the geometry. By default, the geometry is assumed to be in Web Mercator.
radius
number (defaults to 6371008.8) Sphere radius. By default, the mean Earth radius for the WGS84 ellipsoid is used.
Returns:
The spherical area (in square meters).

import {getDistance} from 'ol/sphere';
Get the great circle distance (in meters) between two geographic coordinates.
Name Type Description c1
Array Starting coordinate.
c2
Array Ending coordinate.
radius
number  undefined The sphere radius to use. Defaults to the Earth's mean radius using the WGS84 ellipsoid.
Returns:
The great circle distance between the points (in meters).

import {getLength} from 'ol/sphere';
Get the spherical length of a geometry. This length is the sum of the great circle distances between coordinates. For polygons, the length is the sum of all rings. For points, the length is zero. For multipart geometries, the length is the sum of the length of each part.
Name Type Description geometry
Geometry A geometry.
options
Options for the length calculation. By default, geometries are assumed to be in 'EPSG:3857'. You can change this by providing a
projection
option.Name Type Description projection
ProjectionLike (defaults to 'EPSG:3857') Projection of the geometry. By default, the geometry is assumed to be in Web Mercator.
radius
number (defaults to 6371008.8) Sphere radius. By default, the mean Earth radius for the WGS84 ellipsoid is used.
Returns:
The spherical length (in meters).
Type Definitions

SphereMetricOptions{Object}

Object literal with options for the
getLength
orgetArea
functions.Properties:
Name Type Argument Default Description projection
ProjectionLike <optional>
'EPSG:3857' Projection of the geometry. By default, the geometry is assumed to be in Web Mercator.
radius
number <optional>
6371008.8 Sphere radius. By default, the mean Earth radius for the WGS84 ellipsoid is used.