[GRASS-user] Raster Import/ crop solution

[Micha Silver]

On 06/14/2010 02:42 PM, Kyaw Moe Aung wrote:
> Dear Micha and Hamish
> Thanks for your solution and explanation regarding to raster import. 
> Still i am confusing with rgb file. There are three rgb files that 
> created first then when using i.rectify, another three rgb come with 
> given extension. That make in total 6 files. Then r.composite as 
> another colored image. I wish to use this color contour map just for 
> digitizing. So can i delete all 6 rgb files. I tried to delete three 
> rgb files after compositing. but there is a problem for rectifying. So 
> i had to import again those deleted rgb files. And for rectifying it 
> took half an hour for completion. That's why i asked this question.
> Thanks very much.
>
I think your workflow should be:
1) import the tiff (r.in.gdal) creating the three *.red, *.green *.blue 
files
2) Add all three bands to an imagery group (i.group)
3) Set up points for the rectification (i.points)
4) Run i.rectify
5) Now you can do r.composite with the new, rectified triple of *.red, 
*.green, *.blue.  (Review Hamish's comments about loss of information 
when using r.composite)
6) If you're satisfied with the result, remove all 6 separate band rasters.

> -- 
> -*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-*-
> U Kyaw Moe Aung, Staff Officer
> Planning & Statistics Division, Forest Department, Director General's 
> Office
> Nay Pyi Taw, Ph:095-67-405016, Fax: 095-67-405016
>
> This mail was received via Mail-SeCure System.
>
>
> _______________________________________________
> grass-user mailing list
> grass-user at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/grass-user
>
> This mail was received via Mail-SeCure System.
>
>
>    


-- 
Micha Silver
Arava Development Co. +972-52-3665918
http://surfaces.co.il


-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/grass-user/attachments/20100614/c73898dc/attachment-0001.html