Rebelious DEM

Hi,

Zitat von "PRL"

I imported several 90m DEM maps for Africa (now available on internet).
With two of them I get excellent track coverage. With the last at the end of the computation of the triangles there remains just the blue background screen, all traces have gone.

As long as you do not tell me the location/name of that DEM, I will hardly be ablet to check.

Zitat

I noted that the computation of the triangles shows progress sometimes in black, sometimes in red. What is the significance of that color?

If the result is in red, you try to compute in a higher resolution then the DEM-file basically can offer.

Zitat

Anyway I managed to get another to fail (there is no hgt file available for that track) and the distinctive point is that the stat min (res) shows a res of 0 (zero) for those that fail.

..to fail... doing what ?
Not to run out of elevation information, I have always installed the srtm30
set of the respective region, so TTQV can switch.

I run about 6000 SRTM3 files Europe/Asia from a single folder
simultaneously, backed by the respective srtm30. No problems so far.
However, I certainly did not touch every single srtm3 file

Zitat von "PRL"

....Separately, can it be possible to change the range of color so that when one exagerate the altitude one can also exagerate the color range and magnify the effect?

Pardon, what are you talking about? 3D or Trackcolor ?

Zitat

4, I could not get the Waypoints to show up on the 3D, just the Track. Is there a way to make :prost: it happen?

If you display the waypoints on a map or Sat-Pic, then overlay this to the
3D, then you will see the waypoint "printed" there. There os no way to
show WPs separately like you can do it with a Track.

Zitat

Tx for all, I am really, really pleased with the result in 90m.
The only glitch (the file in the West) is that the data was captured in Feb 2000 and therefore the snow cover on the Atlas at that time of the year makes for erroneous data. ....

Add the SRTM30, these glitches will look much better then.

Zitat von "PRL"

I meant changing the range of colors on the 3D diagram, THe altitude I know how to.
Thanks, Pierre

Hi,
understood now. No there is no way now to do that manually.
But if I see it right, these color values are always adapted to the
min/max elevation to be shown, so the entire color range is used?
Don´t you see it that way ?

Zitat von "PRL"

Nope!
On the Himalaya it goes up from green through yellow and red to white. In the Atlas it moves only from red to white. I can send you the jpg if you want and the trk file.

Hi,
nix "nope", yes!
Probably there is somewhere in the respective area a very little "wrong low
elevation number", which causes the entire spectrum to be spread that way.

Zitat von "PRL"

..... in the Atlas on the 3D there are a lot of drapes of white that fall through the floor like going into a sea trench. .....

You should not see them if you have the respective SRTM30 installed additionally and active ?

Zitat

If I knew how to go into these elevation files I would replace all these false points by the lowest elevation I know from the track.

Sorry, I never tried that. But probably there are explanations about the
structure available from the origin location.

Zitat von "PRL"

Or is TTQV averaging with the help of the two files (SRTM3 and 30) to plug in any missing points?

Hi,
if a value is missing in SRTM3, TTQV3 retrieves the value from the next better
DEM (SRTM30).

Zitat

But then why the drapes?

I do not know, whether you installed and activated the DEMs the right way,
- all srtm3 in one folder, then import only one of them, TTQV registers them all
- all srtm30 in one folder, then import every single srtm30
If you add srtm3 files to the srtm3 folder, delete the registration in QV-Xplorer, DEMs, reregister one SRTM3.

Zitat von "PRL"

....Not good practice to have everything scattered, right! I will clean, but this should not impact the current question? Oder?

Hi,
fix it, then let´s see.

Zitat von "PRL"

.....Just forgot to unzip both HDR and DEM files....

Autsch!!!

Glad it is finally working !