[GRASS-user] get coords from a raster

[Margherita Di Leo]

Christian,

thank you for answering. My problem is that I don't want to use the slope
map to get slope, bu i want to calculate it as the
ratio between the difference of the elevation and the distance between two
given points (pixels). To do that, I need to get the coordinates of the
points as a input file for r.profile.

Margherita


2010/6/2 Christian Schwartze <christian.schwartze at uni-jena.de>

>  Why are you not using r.statistics, since it takes one base map (your
> path as a raster) and another map containing data you want to analyze (your
> slope). With the "average" option/method you will get the desired result, if
> I understand you correctly...
>
> Christian.
>
>  *From:* Margherita Di Leo <diregola at gmail.com>
> *Sent:* Wednesday, June 02, 2010 6:17 PM
> *To:* grass-user at lists.osgeo.org
> *Subject:* [GRASS-user] get coords from a raster
>
> Hi List,
>
> I'm trying to make a script to calculate the slope along a path. I want to
> calculate the slope as the average of cell per cell slope. For my purpose I
> found r.profile to produce the input file for my script, but I have to give
> it the coordinates of the points. As I have a raster and not a vector, I was
> wondering if is there a non interactive way like a d.where or something like
> that, that i can use for my purpose. I mean, i have a raster in which there
> is the path i'm interested in, and the other cells are null.
>
> Thank you in advance
>
> Margherita
>
> ------------------------------
>
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/grass-user/attachments/20100602/a7ab92c7/attachment.html