[GRASS-user] Re: r.mapcalc

GRASS GRASS user
1

Jainita,

Create a map with the line of sight you want to analyze. Reclassify it
(r.reclass or r.recode) to make the cells in the line you want to analyze 1
and the rest of the cells 0.

Michael

On 10/21/07 10:40 PM, "ec.jkd@tpcsed.com" <ec.jkd@tpcsed.com> wrote:

Hi,
thank you for yr advice butcan you tell me how to prepare this binary file

Thanks,
jainita>

Jainita,

Use the binary map setting to specify the area you want to do visibility
analysis for. It should be 1 where you want visibility/los calcuations and 0
where you don't want this calculated.

Michael

On 10/17/07 9:30 PM, "jainita" <ec.jkd@tpcsed.com> wrote:

Hi,I tried with r.los but it gives visibility all over i.e in 360degree for
the distance specified.
But I want only between two points in a line i.e not 360 degree so can you
help me with it.
I would be really oblige if you help me since I am racking my mail a lot on
this and still unable to find the solution
Thanking you once again

-----Original Message-----
From: Michael Barton [mailto:michael.barton@asu.edu]
Sent: Wednesday, October 17, 2007 7:59 PM
To: ec.jkd@tpcsed.com; atlasis@telecom.ntua.gr; rchirgwin@ozemail.com.au;
silvia.franceschi@ing.unitn.it; josh_0882@yahoo.com; saldinet@yahoo.es;
nkdiitd2002@gmail.com; grassuser@grass.itc.it;
grassuser_request@grass.itc.it
Subject: Re: r.mapcalc

Use r.los for line of site calculations.

Michael

On 10/17/07 5:36 AM, "ec.jkd@tpcsed.com" <ec.jkd@tpcsed.com> wrote:

hi,
i am working on grass and want to know how r.mapcalc can be used for
calculation of pat_map/mask.
syntax says---------------r.mapcalc pat)mkap="if(where_you_want,1, 0)" for
creating a map which can be used to calcualte line of sight between two

points

can anyone elaborate on it with an eg:say i want to know what all is beign
seen between any two co-ordinate in map.
Please help,i am doing for the first time

Thanking You,
Jainita

__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

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

__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics and Complexity
Arizona State University

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

__________________________________________
Michael Barton, Professor of Anthropology
Director of Graduate Studies
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

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