[R-sig-Geo] Random forest script - problems with training areas polygon?

[Silvia Flaherty]

Hi all,



I have been working with the random forest R script and have had no
problems at all up to now.

I recently modified the training areas shapefile. It´s actually an edited
version of the original shapefile (which worked just fine). Same
projection, etc, only the areas are smaller and more specific. That's the
only input I changes. The script reads the shapefile but it doesn't do the
classification.



The error  I get is:

 Error in `[.data.frame`(satValues, , 2) : undefined columns selected



Checking line by line, he problem seems to be (line 139 of the loop):

satValues <- extract(satImage, class_data[i,], cellnumbers=TRUE, df=TRUE)





I´m not very skilled at using R but I´m quite OK with GIS. I have tried
editing the shapefile again, saving it as another file, etc. Same result.



Any ideas what could be going wrong?

Thanks!



Silvia


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