[GRASS-user] Re: r.mapcalc

[Michael Barton]

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 at tpcsed.com" <ec.jkd at 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 at 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 at asu.edu]
>>> Sent: Wednesday, October 17, 2007 7:59 PM
>>> To: ec.jkd at tpcsed.com; atlasis at telecom.ntua.gr; rchirgwin at ozemail.com.au;
>>> silvia.franceschi at ing.unitn.it; josh_0882 at yahoo.com; saldinet at yahoo.es;
>>> nkdiitd2002 at gmail.com; grassuser at grass.itc.it;
>>> grassuser_request at 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 at tpcsed.com" <ec.jkd at 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