Plot ellipses at grid intersection points, as a method for indicating the distortion inherent in the projection .
numeric vector of length 2, specifying the increment in
longitude and latitude for the grid. Indicatrices are drawn at e.g.
numerical scale factor for ellipses. This is multiplied by
extra arguments passed to plotting functions, e.g.
The purpose and interpretation are outlined in , but should also be self-explanatory.
1. Snyder, John P., 1987. Map Projections: A Working Manual. USGS Professional Paper: 1395 (available at pubs.usgs.gov/pp/1395/report.pdf).
A map must first have been created with
Other functions related to maps:
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