isLonLat function

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

Returns

Logical

Examples

r <- raster()
isLonLat(r)
crs(r) <- "+proj=lcc +lat_1=48 +lat_2=33 +lon_0=-100 +ellps=WGS84"
isLonLat(r)