Hi Vincent,
Yes it' works ! thank you for the trick
Regards,
Frank
Le 07/04/2023 à 13:37, Vincent Bain a écrit :
Hi Franck,
I would suggest you to do sth as follows :
- if necessary add vertice along your 3d lines (v.split ?) so their
"density" is roughly equivalent to (or better smaller than) your target
raster resolution ;
- turn your vector lines to points using v.to.points (with use=vertex
argument) ;
- convert this vector point map to a raster with v.to.rast (with use=z
argument) ;
- depending on what you do afterwards with that map, you can have a
look at r.null to manage null raster cells (e.g. setnull=0).
Hope this helps,
V.
Le vendredi 07 avril 2023 à 12:45 +0200, Frank David a écrit :
Hello,
Thank you for your message. But I don't think it helps me.
I want to add a bridge elevation to my DEM. So if I create a 3d
vector
line (my bridge) with two vertex at x,y,z coordinates, and is it
possible to convert in a raster where each cells crossed by the line
inherits of his extrapolated altitude ? If no module exists to do
that,
what would be the operations necessary to achieve this result ? I
hope
it is clearer.
Frank
Le 07/04/2023 à 10:16, Helmut Kudrnovsky a écrit :
Is there a way to rasterize a 3d line to get altitude on raster
cells
crossed by the line ?
not quite sure what are you trying to do?
maybe:
v.drape:
Converts 2D vector features to 3D by sampling of elevation raster
map. (https://grass.osgeo.org/grass82/manuals/v.drape.html)
Additional vertices can be added to the input 2D vector map with
v.split.
or the something like:
v.fixed.segmentpoints - segment points along a vector line with
fixed distances
(https://grass.osgeo.org/grass82/manuals/addons/v.fixed.segmentpoints.html
) followed by
v.what.rast - Uploads raster values at positions of vector points
to the table
(https://grass.osgeo.org/grass82/manuals/v.what.rast.html) or
v.sample - Samples a raster map at vector point locations
(https://grass.osgeo.org/grass82/manuals/v.sample.html).
kind regards
helmut
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