hscattergram between two different variables

----Messaggio originale----
Da: Roger.Bivand at nhh.no
Data: 03/04/2009 21.40
A: "milton ruser"<milton.ruser at gmail.com>
Cc: <r-sig-geo at stat.math.ethz.ch>
Ogg: Re: [R-sig-Geo] rasterize shape file and output as .img

On Fri, 3 Apr 2009, milton ruser wrote:

Dear all,

I have a set of shapefile and I need rasterized it using a collumn called
ClassCover,
and with the resolution of 30 meters. How can I do this on R?

Use bbox() of the SpatialPolygonDataFrame to find the extent. Create a 
GridTopology object, and overlay the polygons - possibly just with 
ClassCover - and the SpatialGrid built with the GridTopology object. This 
should yield a SpatialGridDataFrame with a single band, with NAs outside 
the polygons, and the polygon column values for raster cells where their 
centres fall inside the polygons.

Another thing is that I need to output the raster as IMG (erdas/arcgis)
format.

writeGDAL in rgdal.

Hope this helps,

Roger

Any help are welcome.

Best wishes,

milton
Brasil/Toronto

require(maptools)
require(sp)
require(rgdal)
todos<-readShapePoly("myshape.shp")
sessionInfo()

R version 2.9.0 alpha (2009-03-26 r48224)
i386-pc-mingw32
locale:
LC_COLLATE=English_Canada.1252;LC_CTYPE=English_Canada.1252;

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base
other attached packages:
[1] rgdal_0.6-7     maptools_0.7-20 sp_0.9-32       foreign_0.8-34
loaded via a namespace (and not attached):
[1] grid_2.9.0      lattice_0.17-20

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-- 
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