Test whether a SpatRaster or SpatVector has a longitude/latitude coordinate reference system (CRS), or perhaps has one. That is, when the CRS is unknown (
"") but the x coordinates are within -181 and 181 and the y coordinates are within -90.1 and 90.1. For a SpatRaster you can also test if it has a longitude/latitude CRS and it is "global" (covers all longitudes).
A warning is given if the CRS is missing or if it is specified as longitude/latitude but the coordinates do not match that.
# S4 method for SpatRaster is.lonlat(x, perhaps=FALSE, warn=TRUE, global=FALSE) # S4 method for SpatVector is.lonlat(x, perhaps=FALSE, warn=TRUE) # S4 method for character is.lonlat(x, perhaps=FALSE, warn=TRUE)
SpatRaster or SpatVector
TRUE and the CRS is unknown, the method returns
TRUE if the coordinates are plausible for longitude/latitude
TRUE, a warning is given if the CRS is unknown but assumed to be lon/lat and
TRUE, the method tests if the raster covers all longitudes (from -180 to 180 degrees) such that the extreme columns are in fact adjacent
logical or NA