Package required but not available: ‘rgdal’

Package suggested but not available for checking: ‘hydroGOF’

See section ‘The DESCRIPTION file’ in the ‘Writing R Extensions’
manual.
Package required but not available: ‘rgdal’

Package suggested but not available for checking: ‘hydroGOF’

See section ‘The DESCRIPTION file’ in the ‘Writing R Extensions’
manual.
Namespaces in Imports field not imported from:
  ‘ncdf4’ ‘rgdal’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘ncdf4’ ‘rgdal’
  All declared Imports should be used.