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Linear units of the coordinate reference system

linearUnits.Rd

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 perimeter measures to meters. The value returned for longitude/latitude crs is zero.

Usage

# S4 method for SpatRaster
linearUnits(x)

# S4 method for SpatVector
linearUnits(x)

Arguments

x

SpatRaster or SpatVector

Value

numeric (meter)

See also

crs

Examples

x <- rast()
crs(x) <- ""
linearUnits(x)
#> [1] NaN

crs(x) <- "+proj=longlat +datum=WGS84"
linearUnits(x)
#> [1] 0

crs(x) <- "+proj=utm +zone=1 +units=cm"
linearUnits(x)
#> [1] 0.01

crs(x) <- "+proj=utm +zone=1 +units=km"
linearUnits(x)
#> [1] 1000

crs(x) <- "+proj=utm +zone=1 +units=us-ft"
linearUnits(x)
#> [1] 0.3048006