A 'SpatialPolygonsDataFrame' [package "sp"] object containing country boundaries derived from Natural Earth data. Polygons are attributed with country codes. Derived from version 1.4.0 of Natural Earth data 1:50 m data.
The format is: Formal class 'SpatialPolygonsDataFrame' [package "sp"] with 5 slots
The different country boundaries in rworldmap are processed from Natural
Earth Data as follows :
~ rename any non-ASCII country names that cause R trouble
~ rename Curacao which is particularly troublesome !
~ check polygon geometries using checkPolygonsHoles
~ set projections, e.g. proj4string(countriesCoarse) <- CRS("+proj=longlat +ellps=WGS84 +datum=WGS84 +no_defs")
~ set polygon IDs to country names (from ADMIN field)
~ copy ISO_A3 to ISO3
~ replace missing ISO3 codes (6 in this version) with ADM0_A3
~ check for duplicate ISO3 codes (2 in this version)
~ set ISO3 for Gaza to Gaza and 'Ashmore and Cartier Islands' to Ashm
~ replace POP_EST of -99 with NA
~ join on countryRegions data
countriesCoarseLessIslands : ne_110
countriesCoarse : ne_110 plus extra countries from ne_50 plus Tuvalu from ne_10
countriesLow : ne_50 plus Tuvalu from ne_10
countriesHigh (in package rworldxtra) : ne_10
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