Is this longitude/latitude data?

Test whether a Raster* or other object has a longitude/latitude coordinate reference system (CRS) by inspecting the PROJ.4 coordinate reference system description. couldBeLonLat also returns TRUE if the CRS is NA but the x coordinates are within -365 and 365 and the y coordinates are within -90.1 and 90.1.

# S4 method for class 'BasicRaster'
isLonLat(x, ...)
# S4 method for class 'Spatial'
isLonLat(x, ...)
# S4 method for class 'BasicRaster'
couldBeLonLat(x, warnings=TRUE, ...)
# S4 method for class 'Spatial'
couldBeLonLat(x, warnings=TRUE, ...)

Arguments

x

Raster* or Spatial* object

warnings

logical. If TRUE, a warning is given if the CRS is NA or when the CRS is longitude/latitude but the coordinates do not match that

...

additional arguments. None implemented

Value

Logical

Examples

r <- raster()
isLonLat(r)
#> [1] TRUE
crs(r) <- "+proj=lcc +lat_1=48 +lat_2=33 +lon_0=-100 +ellps=WGS84"
isLonLat(r)
#> [1] FALSE