The point sampling tool worked for me for 400 000 random sampling point on
Lidar DEM. It works well.
Good luck!
Nicolas Cadieux M.Sc.
Les Entreprises Archéotec inc. 
8548, rue Saint-Denis Montréal H2P 2H2
Téléphone: 514.381.5112  Fax: 514.381.4995
www.archeotec.ca
On Dec 16, 2015 18:24, "kwanza [via OSGeo.org]"
<[email protected]> wrote:
Thanks everyone, will try these suggestions, let's see which one
allows the most effective workflow. Can use GRASS as well, but still waiting
for my DEM though. thank you all, Szilard On 16 December 2015 at 15:57, Szilard
Albert < [hidden email] > wrote: <blockquote
style="border-left:2px solid #cccccc;padding:0 1em"
style="margin:0 0 0 0.8ex;border-left:1px #ccc
solid;padding-left:1ex"> Hello, I need to extract elevation values from
a DEM at certain points for which I have X and Y values. My points are
contained in several profiles, each profile with hundreds of points. My input
is a text file, one file per profile, with the following format: PointA X Y
PointB X Y ...... PointZ X Y. I would like a solution where I can feed the
above text input, and get my output as another text file with similar format,
Point X Y Z (or Point Z X Y). Alternatively just a text file with one column
containing Z, but exactly same number of rows, so I can copy and paste to the
input. One single command that solves one point only would do as well, I would
just create a script file from my every text file for every line.... Any
suggestions would be greatly appreciated. I am using QGIS 2.8 Wien in Ubuntu.
Thank you. Szilard
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