Packages required but not available: 'maptools', 'rgdal'

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

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