[R-sig-Geo] Looping through pixels in a SpatialGridDataFrame

[Edzer Pebesma]

On 12/22/2011 02:26 PM, jjcabrera20 wrote:
> Thanks Jan
> I will take a look on the links.
> But any way there is a method to loop inside a SpatialPixelDataFrame?

You can address individual pixels, as in:

library(sp)
loadMeuse()

gridded(meuse.grid)
class(meuse.grid)

meuse.grid[10,] # pixel 10
meuse.grid[10,][["dist"]] # attr "dist" for pixel 10

for looping over rows and columns, you'd like to convert to
SpatialGridDataFrame, as in:

fullgrid(meuse.grid) = TRUE
meuse.grid[50:51,50:51] # select a region defined by row/col ranges
meuse.grid[50,50] # which should work, but doesn't for some reason.

> 
> 
> Best,
> 
> Jorge
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de