[R-sig-Geo] create an Hexagonal grid

[Roger Bivand]

On Wed, 15 Sep 2010, Greg Snow wrote:

> There is the hexbin package available through Bioconductor.  It uses 
> grid graphics I believe.
>
> If you want a base graphics solution, or just more hands on control (and 
> using only CRAN packages), then check out the last example on the help 
> page for the my.symbols function in the TeachingDemos package.
>

For sp objects, see the "hexagonal" type in spsample(), the low-level 
sp:::genHexGrid(), and HexPoints2SpatialPolygons():

hpts <- sp:::genHexGrid(dx=0.1, ll=c(0, 0), ur=c(1, 1))
pols <- HexPoints2SpatialPolygons(SpatialPoints(hpts))
plot(pols)

Hope this helps,

Roger

>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no