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

Package suggested but not available for checking: ‘maptools’

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

Package suggested but not available for checking: ‘maptools’

See section ‘The DESCRIPTION file’ in the ‘Writing R Extensions’
manual.