Namespaces in Imports field not imported from:
  ‘raster’ ‘rgdal’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘raster’ ‘rgdal’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  'raster' 'rgdal'
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘raster’ ‘rgdal’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘raster’ ‘rgdal’
  All declared Imports should be used.