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I have a raster for which I want to find the Cell Location (Row, Col) if I have the Lat-long information.

I know how to get the value of a particular cell using lat long.

extract(ras,SpatialPoints(cbind(-82.8,35.2))) 

But I need the row-col of this cell, rather than it's value. I am using the raster package in R.

Raster: https://www.dropbox.com/s/8nhfirxr2hm3l4v/fdr_fb.tif?dl=0

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# Open tif file
ras <- raster("fdr_fb.tif")

# "extract" function can return the cell number, here 8766
extract(ras,SpatialPoints(cbind(-82.8,35.2)), cellnumbers=TRUE) 
# cells fdr_fb
#  8766      2

# We store the cell number
id.cell <- extract(ras,SpatialPoints(cbind(-82.8,35.2)), cellnumbers=TRUE)[1]

# We extract row and col indices with "rowColFromCell"
rowColFromCell(ras, id.cell)
#      row col
# [1,]  75  34

# Verification
ras[75, 34]
# 2
  • 1
    Can simplify to rowColFromCell(ras, cellFromXY(ras, cbind(-82.8,35.2))) – mdsumner Dec 26 '15 at 1:12
  • @mdsumner yes it can – user32309 Dec 26 '15 at 14:15

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