getCtryPolyUrl: Get the GADM url from which to download country polygons
Description
Get the url from which to download country polygons. Polygons are downloaded from
http://www.gadm.org. This provides the url to the zipped ESRI Shapefile
which when decompressed contains a directory with the different country admin
level boundary files. A sample url returned for Afghanistan:
http://biogeo.ucdavis.edu/data/gadm2.8/shp/AFG_adm_shp.zip
Usage
getCtryPolyUrl(ctryCode)
Arguments
ctryCode
character string The ctryCode of interest
Value
Character string url of the zipped ESRI shapefile for the ctryCode