calcArea: Calculate Cell Raster Area
In pik-piam/geodata: Landuse geodata library

Description Usage Arguments Value Author(s) Examples

Function calculates the area of a raster file. Either a raster file is directly specified, or defined by it's resolution, projection and extent. Method works for input in longlat or equal area projection with unit in meters.

1	calcArea(x=NULL, res=NULL, proj=NULL, ext=NULL, cache=T, writecache=T)

`x`	File for which the area should be calculated
`res`	Resolution for which calculations should be done. If only one number is specified, assumes square cells
`proj`	projection as CRS. e.g. "+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0"
`ext`	extent for calculations. e.g. c(-180,180,-90,90)
`cache`	if TRUE function looks for pre-calculated area in cache
`writecache`	if TRUE function writes newly calculated area to cache folder

Either a raster or just the number for equal area projections

Ulrich Kreidenweis

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## Not run: calcArea(res=0.5, proj="+proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0",
         ext=c(-180,180,-90,90))
## End(Not run)