rnaturalearth (version 0.1.0)

check_data_exist: check whether the requested data exist on Natural Earth

Description

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.

Usage

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

Value

TRUE or FALSE

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'

Examples

check_data_exist( scale = 110, category = 'cultural', type = 'countries' )
# type not in list for this category
check_data_exist( scale = 110, category = 'physical', type = 'airports' )
# type in list but scale shows FALSE
check_data_exist( scale = 110, category = 'cultural', type = 'airports' )