[Qgis-user] DEM

[Nicolas Cadieux]

Hi, 
Not an easy question... 
Tools you can use: 
Vector/geometry tools/densify geometry: that can add extra vertex to the lines so you get more points in the next step. 
Vector/geometry tools/extract nodes with give you points. 
You can get info from one layer to another using the point sampling tool plugin or lines or polygons using vector/data management tools/join attributes by location. 
You could use an external DEM like srtmgl1 to help out. 
These are just ideas... 
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 Nov 27, 2015 14:16, "Nuno de Santos Loureiro [via OSGeo.org]	" <ml-node+s1560n5238889h20 at n6.nabble.com> wrote: 

	Hello every body,
I am trying to improve the quality of a 90 km2 DEM. I have shapefiles  
for the 10 meters contour lines and the complete stream network, but  
for the streams Z is not available.
Is there available any tool to extract the vertices of the streams  
segments, to use Z data where available (interception of streams with  
contours) and to interpolate Z for the other vertices, in order to run  
a TIN including stream vertices along the thalwegs?
I am trying to reduce the number of flat triangles, to improve the DEM  
quality and consequently que quality of slope and aspect maps...
Many thanks for any tip!
Kind regards,
Nuno
Nuno
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Nuno de Santos Loureiro (PhD)
Faculdade de Ciências e Tecnologia - DCTMA - Ed. 8
Universidade do Algarve
Campus de Gambelas
8005-139 FARO   (Portugal)
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