> How about just using high-level maptools? Following on directly from your > code, the function elide can rotate the grid polygons: > > library(maptools) > plot(elide(grdp, rotate = -45), add = TRUE)
Yes, elide should work for my needs. Thank you for pointing it out! > Is your data in a real geographic coordinate system, like UTM or is this > simply a model with no base on the ground:? The grid has uniform spacing and I can easily define it with the lower left corner at (0,0), and extending to the right and up. But I want to rotate the grid and convert the points to a geographic coordinate system like UTM (using a georeferenced location for the model grid origin) so that I can plot the grid over a Google Map background. I know how to do it using the grid package--a rotated viewport for the model grid and relative coordinates within the viewport, but I would like to learn how to do it using and saving actual geographic coordinates for the grid, so that I can use higher level plotting functions. I think can get there using the wonderful capabilities of elide(). Scott Waichler _______________________________________________ R-sig-Geo mailing list R-sig-Geo@r-project.org https://stat.ethz.ch/mailman/listinfo/r-sig-geo
