I used the rgdal package to open a geoTiff and then manipulate the  
data.  The result is a 3-dimensional array that I want to convert back  
to a SpatialGridDataFrame in order to save it as a geoTiff.  I used  
the following code:

grd <- GridTopology(gt[,1],gt[,2],gt[,3])
SGDF <-  
SpatialGridDataFrame(grd,data=data.frame(c(data)),proj4string=CRS(proj))

Which works fine for a single band image (a 2-Dimensional matrix).   
When I used this code on a 3D array, I get the following error:

Error in validityMethod(object) :
   unequal number of objects in full grid and data slot

Does anyone have a solution?  Thanks.

Jonathan B. Thayn
Ph.D. Candidate – Geography and Remote Sensing
University of Kansas
2101 Constant Avenue, Higuchi Hall, Rm 121
Lawrence, Kansas 66047-3759
[EMAIL PROTECTED]
people.ku.edu/~jonthayn


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