We have, therefore, created the Maps package which contains some new functions as well as slightly revised versions of addcoords , changecoords and coordplot from the plots packag. To load the Maps package we must include the path in the global variable libname as shown below. Note that the file maple.lib must not be located in the existing lib directory. There are literally hundreds of map projections that have been described in the cartographic literature. The Maps package comes with a number of predefined projections that can be identified and constructed by makeprojections .
Some projections require other projections to be defined first.
The largest body has an index of 0 and represents the continuous coastline of Europe, Africa, and Asia. There are many islands and lakes with only four data points. An example is provided below.