R: Linear units of the coordinate reference system

linearUnits {terra} | R Documentation

## Linear units of the coordinate reference system

### Description

Get the linear units of the coordinate reference system (crs) of a SpatRaster or SpatVector expressed in m. The value returned is used internally to transform area and perimenter measures to meters. The value returned for longitude/latitude crs is zero.

### Usage

    ## S4 method for signature 'SpatRaster'
    linearUnits(x)

    ## S4 method for signature 'SpatVector'
    linearUnits(x)

### Arguments

`x` | SpatRaster or SpatVector

### Value

numeric (meter)

### See Also

`crs`

### Examples

    x <- rast()
    crs(x) <- ""
    linearUnits(x)

    crs(x) <- "+proj=longlat +datum=WGS84"
    linearUnits(x)

    crs(x) <- "+proj=utm +zone=1 +units=cm"
    linearUnits(x)

    crs(x) <- "+proj=utm +zone=1 +units=km"
    linearUnits(x)

    crs(x) <- "+proj=utm +zone=1 +units=us-ft"
    linearUnits(x)

[Package terra version 1.4-22 Index]