[R-sig-Geo] How to change raster cell value by coordinates?
Thiago Veloso
thi_veloso at yahoo.com.br
Thu Feb 9 16:29:08 CET 2012
Dear list,
I wonder if there is a way to change the values of a raster grid using the coordinates as a condition. Please consider the raster below:
> library(raster)
> amz<-raster("/home/data/amz.img")
> amz
class : RasterLayer
dimensions : 47, 65, 3055 (nrow, ncol, ncell)
resolution : 0.5, 0.5 (x, y)
extent : -74, -41.5, -17.5, 6 (xmin, xmax, ymin, ymax)
coord. ref. : NA
values : /home/data/amz.img
min value : 0
max value : 1
This is what I would like to do:
>amz[-55,2]<-0.5
Package "raster" offers a 'replacement' function that seemed promising, but its arguments are row and column numbers, instead of coordinates.
Could anyone please point out another option?
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