getData(name, download=TRUE, path='', ...)TRUE data will be downloaded if not locally availablename is 'alt' or 'GADM' you must provide a 'country=' argument. Countries are specified by their 3 letter ISO codes. Use getData('ISO3') to see these codes. In the case of GADM you must also provide the level of administrative subdivision (0=country, 1=first level subdivision). In the case of alt you can set 'mask' to FALSE. If it is TRUE values for neighbouring countries are set to NA. For example:
getData('GADM', country='FRA', level=1)
getData('alt', country='FRA', mask=TRUE)
If name is 'SRTM' you must provide 'lon' and 'lat' arguments (longitude and latitude). These should be single numbers somewhere within the SRTM tile that you want.
getData('SRTM', lon=5, lat=45)
If name='worldclim' you must also provide a variable name 'var=', and a resolution 'res='. Valid variables names are 'tmin', 'tmax', 'prec' and 'bio'. Valid resolutions are 0.5, 2.5, 5, and 10 (minutes of a degree). In the case of res=0.5, you must also provide a lon and lat argument for a tile; for the lower resolutions global data will be downloaded. In all cases there are 12 (monthly) files for each variable except for 'bio' which contains 19 files.
getData('worldclim', var='tmin', res=0.5, x=5, y=45)
getData('worldclim', var='bio', res=10)