# Documentation

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# utmgeoid

Select ellipsoids for given UTM zone

## Syntax

```ellipsoid = utmgeoid ellipsoid = utmgeoid(zone) [ellipsoid,ellipsoidstr] = utmgeoid(...) ```

## Description

The purpose of this function is to recommend a local ellipsoid for use with a given UTM zone, depending on the geographic location of that zone. Use it only if you are not using a global reference ellipsoid, such as the World Geodetic System (WGS) 1984 ellipsoid. In many cases, depending on your application, you should just use the output of `wgs84Ellipsoid`, or one of the other options available through `referenceEllipsoid`.

`ellipsoid = utmgeoid`, without any arguments, opens the `utmzoneui` interface for selecting a UTM zone. This zone is then used to return the recommended ellipsoid definitions for that particular zone.

`ellipsoid = utmgeoid(zone)` uses the input `zone` to return the recommended ellipsoid definitions.

`[ellipsoid,ellipsoidstr] = utmgeoid(...)` returns the short name(s) for the reference ellipsoid(s), as used by `referenceEllipsoid`, in a `char` array with one name in each row.

## Background

The Universal Transverse Mercator (UTM) system of projections tiles the world into quadrangles called zones. Each zone has different projection parameters and commonly used ellipsoidal models of the Earth. This function returns a list of ellipsoid models commonly used in a zone.

## Examples

```zone = utmzone(0,100) % degrees zone = 47N [ellipsoid,names] = utmgeoid(zone) ellipsoid = 6377.3 0.081473 6377.4 0.081697 names = everest bessel ```

## See Also

#### Introduced before R2006a

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