[R-sig-Geo] Rotating hexagonal grid

[Dr. Gerald Jurasinski]

Dear List,

There is a nice implementation to create hexagonal grids in the sp  
package as an option to the spsample method. Many thanks to Edzer for  
this. In the ASDAR book on page 137 it is written: "Note that an  
alternative hexagonal representation is obtained by rotating this grid  
90°; we will not further consider that here". That's a pity because  
that is what I would like to do. So can you give a  hint on how to  
obtain grid rotations? In general and specifically for hexagonal grids  
(I guess it is the same)? And is it possible to rotate the grid easily  
with whatever angle wanted? Maybe it would be interesting to include  
the grid rotation as an example in the spsample help?

Thank you very much
Best regards
Gerald

——————————————————

Dr. Gerald Jurasinski
Landscape Ecology and Site Evaluation
Institute for Management of Rural Areas
Faculty of Agricultural and Environmental Sciences
University of Rostock
Justus-von-Liebig-Weg 6
18059 Rostock
Germany

gerald.jurasinski at uni-rostock.de
http://www.auf.uni-rostock.de/loe
+49 381 4983225 (tel)
+49 381 4983222 (fax)