measuring map similarity?
On Wed, Aug 1, 2012 at 2:39 PM, Jason Robinson
<jason.lesley.robinson at gmail.com> wrote:
Hoping someone might be able to steer me in the right direction, not sure where to look I have several different modeling methods to predict patterns of species occurrences over the same geographic area. I'd like to compare the shape and position of the predicted areas between maps, in reference to a "true distribution" map. Since I have irregular polygons instead of raster cells this gets a little hairy for me to think about coding. I thought that epidemiologists might have some experience with this problem.
Sounds like you could just use the polygon overlay methods in the rgeos package. Should be trivial to overlay your estimates, A, on your truth, B, and get three parts - A on its own, B on its own, and the overlap of A and B. gIntersection and gDifference are probably all you need... Barry