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Geometry Library | Maps JavaScript API

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google.maps.geometry.encoding class

Utilities for polyline encoding and decoding.

Access by calling const {encoding} = await google.maps.importLibrary("geometry").
See Libraries in the Maps JavaScript API.

google.maps.geometry.spherical class

Utility functions for computing geodesic angles, distances and areas. The default radius is Earth's radius of 6378137 meters.

Access by calling const {spherical} = await google.maps.importLibrary("geometry").
See Libraries in the Maps JavaScript API.

computeArea(path[, radiusOfSphere])

• path:  Array<LatLng|LatLngLiteral>|MVCArray<LatLng|LatLngLiteral>|Circle|CircleLiteral|LatLngBounds|LatLngBoundsLiteral
• radiusOfSphere:  number optional

Return Value:  number

Returns the unsigned area of a closed path, in the range [0, 2×pi×radius²]. The computed area uses the same units as the radius. The radiusOfSphere defaults to the Earth's radius in meters, in which case the area is in square meters. Passing a Circle requires the radius to be set to a non-negative value. Additionally, the Circle must not cover more than 100% of the sphere. And when passing a LatLngBounds, the southern LatLng cannot be more north than the northern LatLng.

computeDistanceBetween(from, to[, radius])

• from:  LatLng|LatLngLiteral
• to:  LatLng|LatLngLiteral
• radius:  number optional

Return Value:  number

Returns the distance, in meters, between two LatLngs. You can optionally specify a custom radius. The radius defaults to the radius of the Earth.

computeHeading(from, to)

• from:  LatLng|LatLngLiteral
• to:  LatLng|LatLngLiteral

Return Value:  number

Returns the heading from one LatLng to another LatLng. Headings are expressed in degrees clockwise from North within the range [-180,180).

computeLength(path[, radius])

• path:  Array<LatLng|LatLngLiteral>|MVCArray<LatLng|LatLngLiteral>
• radius:  number optional

Return Value:  number

Returns the length of the given path.

computeOffset(from, distance, heading[, radius])

• from:  LatLng|LatLngLiteral
• distance:  number
• heading:  number
• radius:  number optional

Returns the LatLng resulting from moving a distance from an origin in the specified heading (expressed in degrees clockwise from north).

computeOffsetOrigin(to, distance, heading[, radius])

• to:  LatLng|LatLngLiteral
• distance:  number
• heading:  number
• radius:  number optional

Returns the location of origin when provided with a LatLng destination, meters travelled and original heading. Headings are expressed in degrees clockwise from North. This function returns null when no solution is available.

computeSignedArea(loop[, radius])

• loop:  Array<LatLng|LatLngLiteral>|MVCArray<LatLng|LatLngLiteral>
• radius:  number optional

Return Value:  number

The area is computed using the parallel transport method; the parallel transport around a closed path on the unit sphere twists by an angle that is equal to the area enclosed by the path. This is simpler and more accurate and robust than triangulation using Girard, l'Huilier, or Eriksson on each triangle. In particular, since it doesn't triangulate, it suffers no instability except in the unavoidable case when an edge (not a diagonal) of the polygon spans 180 degrees.

interpolate(from, to, fraction)

• from:  LatLng|LatLngLiteral
• to:  LatLng|LatLngLiteral
• fraction:  number

Returns the LatLng which lies the given fraction of the way between the origin LatLng and the destination LatLng.

google.maps.geometry.poly class

Utility functions for computations involving polygons and polylines.

Access by calling const {poly} = await google.maps.importLibrary("geometry").
See Libraries in the Maps JavaScript API.

containsLocation(point, polygon)

• point:  LatLng|LatLngLiteral
• polygon:  Polygon

Return Value:  boolean

Computes whether the given point lies inside the specified polygon.

isLocationOnEdge(point, poly[, tolerance])

• point:  LatLng|LatLngLiteral
• poly:  Polygon|Polyline
• tolerance:  number optional

Return Value:  boolean

Computes whether the given point lies on or near to a polyline, or the edge of a polygon, within a specified tolerance. Returns true when the difference between the latitude and longitude of the supplied point, and the closest point on the edge, is less than the tolerance. The tolerance defaults to 10^-9 degrees.

Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 4.0 License, and code samples are licensed under the Apache 2.0 License. For details, see the Google Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2025-07-09 UTC.

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