\BeginKnitrBlock{rmdnote}<div class="rmdnote">It is possible to use a EPSG code in a `proj4string` definition with `"+init=epsg:MY_NUMBER"`.
For example, one can use the `"+init=epsg:4326"` definition to set CRS to WGS84 (EPSG code of 4326).
The PROJ library automatically adds the rest of the parameters and converts them into `"+init=epsg:4326 +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84 +towgs84=0,0,0"`.</div>\EndKnitrBlock{rmdnote}