checks from a list dependent on type, category and scale. If it returns FALSE the data may still exist on the website. Doesn't yet do checking on raster names because I found the naming convention too tricky.

check_data_exist(
  scale = 110,
  type,
  category = c("cultural", "physical", "raster")
)

Arguments

scale

scale of map to return, one of 110, 50, 10 or 'small', 'medium', 'large'

type

type of natural earth file to download one of 'countries', 'map_units', 'map_subunits', 'sovereignty', 'states' OR the portion of any natural earth vector url after the scale and before the . e.g. for 'ne_50m_urban_areas.zip' this would be 'urban_areas' OR the raster filename e.g. for 'MSR_50M.zip' this would be 'MSR_50M'

category

one of natural earth categories : 'cultural', 'physical', 'raster'

Value

TRUE or FALSE

Examples

check_data_exist( scale = 110, category = 'cultural', type = 'countries' )
#> [1] TRUE
# type not in list for this category
check_data_exist( scale = 110, category = 'physical', type = 'airports' )
#> Warning: airports seems not to be in the list for category=physical maybe try the other category of c('cultural', 'physical')
#> [1] FALSE
# type in list but scale shows FALSE
check_data_exist( scale = 110, category = 'cultural', type = 'airports' )
#> Warning: your combination of type, category, scale seem not to exist in the list of Natural Earth data. Check ?ne_download or http://www.naturalearthdata.com/features/ to see data availability.
#> [1] FALSE