Hi all,
1. I made a TIN surface, using the interpolation plugin, from a point
shapefile (with "ALTITUDE" field) and 3D line shapefiles. I lost time
trying to extract the relevant lines from the line shapefiles without
loosing the 3D information (Z values of the nodes).
If I remember well, I first used "Merge Layers" from the mmqgis plugin,
and it kept the Z information. Than, I used the Intersection command in
the Vector menu, and the Z information was lost. Finally, after manually
selecting the relevant lines and using "save as", I got the expected 3D
line shapefile keeping the Z values.
Is this loss of Z information a known limitation of the gdal vector
commands in QGIS (vector menu) and is this limitation affecting all
these commands? Or did I do something wrong?
2. In a second step, I wanted to be able to easily see (through labeling
a Z field) or ask (with the identify command) those Z values from the 3D
lines, so as to fine tune the interpretation of the topography.
Again the gdal tool (in Vector menu) "Node Extraction" lost all Z
information.
Is there a workaround to create a point shapefile with a Z field? Or, at
least, to keep the Z values in a point shapefile, rasterize it so as to
be able to visualize the Z value using the "Identify" command on the
raster?
Thanking all the developers for this wonderful program,
--
Paul
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