[R-sig-Geo] cleaning up a SpatialGridDataFrame
r.hijmans at gmail.com
Tue Mar 8 03:00:02 CET 2011
> I have an image which is a SpatialGridDatafFrame. This image has a number
> cells that i need to erase or to delete but i don`t know how to do this in
It is not clear what you mean with "erase or delete".
If you refer to setting some cell values to NA you can do, with
SpatialGridDataFrame x, things like
x at data[2:5,] <- NA
or make a RasterLayer
r <- raster(x)
x[2:5] <- NA
x[1:2, 1:2] <- NA
or use raster package functions like 'reclass', 'subs', or 'cut'
If you refer to removing entire rows or columns from your grid, you can use
function 'crop' and perhaps 'trim'
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