[GRASSLIST:8203] Re: Making a raster coordinate a value

[Michael Barton]

I¹d like to know the answer to this question also. How do you reclassify (or
simply assign a value to) a raster cell with a particular set of xy
coordinates rather than a particular cell value. I also need to know this
for implementing agent modeling results in GRASS.

Thanks
Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ 85287-2402

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton




From: Joel Peter William Pitt <joel.pitt at gmail.com>
Date: Wed, 7 Sep 2005 16:36:25 -1200
To: <grasslist at baylor.edu>
Subject: [GRASSLIST:8202] Making a raster coordinate a value

Hi all,

What is the simplest way to get get a singular cell in a raster map to be
set to a value,
irregardless of the current regions resolution?

More specifically I want to set closest cell to the origin (0,0) to have
value 1. But only 1 cell must be present, and it must work for any
resolution - although I'm currently concerned with working at res=1.

I've been playing with mapcalc but the way it calculates x() and y() seems
odd and round() rounds them to either 1 or -1, skipping 0. int() truncates
leaving two rows/columns with a value 0.

I'm aware this is a bizarre use of GIS, I'm developing a modelling framework
and I'm currently looking at behaviour from the origin in order to analyse
it's general behaviour before applying it to a real landscape.

Thanks for any help,

Joel


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