# lla2ecef

Convert geodetic coordinates to Earth-centered Earth-fixed (ECEF) coordinates

## Syntax

``ecef = lla2ecef(lla)``
``ecef = lla2ecef(lla,model)``
``ecef = lla2ecef(lla,f,Re)``

## Description

````ecef = lla2ecef(lla)` converts an m-by-3 array of geodetic coordinates (latitude, longitude and altitude), `lla`, to an m-by-3 array of ECEF coordinates, `ecef`. Units are in meters. `ecef = lla2ecef(lla,model)` converts the coordinates for a specific ellipsoid planet. `ecef = lla2ecef(lla,f,Re)` converts the coordinates for a custom ellipsoid planet defined by flattening, `f`, and the equatorial radius, `Re`, in meters.```

example

## Examples

collapse all

This example shows how to determine ECEF coordinates at a latitude, longitude, and altitude.

`p = lla2ecef([0 45 1000])`
```p = 1×3 106 × 4.5107 4.5107 0 ```

This example shows how to determine ECEF coordinates at multiple latitudes, longitudes, and altitudes, specifying WGS84 ellipsoid model.

`p = lla2ecef([0 45 1000; 45 90 2000], 'WGS84')`
```p = 2×3 106 × 4.5107 4.5107 0 0 4.5190 4.4888 ```

This example shows how to determine ECEF coordinates at multiple latitudes, longitudes, and altitudes, specifying the custom ellipsoid model.

```f = 1/196.877360; Re = 3397000; p = lla2ecef([0 45 1000; 45 90 2000], f, Re)```
```p = 2×3 106 × 2.4027 2.4027 0 0 2.4096 2.3852 ```

## Input Arguments

collapse all

Geodetic coordinates (latitude, longitude and altitude), specified as an m-by-3 array in [degrees degrees meters]. Latitude and longitude values can be any value. However, latitude values of +90 and -90 may return unexpected values because of singularity at the poles. Altitude is above the planetary ellipsoid.

Data Types: `double`

Ellipsoid planet model, specified as `'WGS84'`.

Data Types: `char` | `string`

Flattening at each pole, specified as a scalar.

Data Types: `double`

Equatorial radius, specified as a scalar, in meters.

Data Types: `double`

## Output Arguments

collapse all

ECEF coordinates, returned as an m-by-3 array of ECEF coordinates in meters.

## Version History

Introduced in R2006b