[R-sig-Geo] Rotating hexagonal grid

[Greg Snow]

The last example in the help page for the my.symbols function in the TeachingDemos package shows a way to hand build a hexagonal grid, rotating this 90 degrees would not be difficult (interfacing it with whatever other tools you are using in sp may or may not be depending on what you are trying to do).

Hope this helps,

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org
801.408.8111


> -----Original Message-----
> From: r-sig-geo-bounces at stat.math.ethz.ch [mailto:r-sig-geo-
> bounces at stat.math.ethz.ch] On Behalf Of Dr. Gerald Jurasinski
> Sent: Monday, May 11, 2009 1:32 AM
> To: r-sig-geo at stat.math.ethz.ch
> Subject: [R-sig-Geo] Rotating hexagonal grid
> 
> 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)
> 
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