Presagis

Hopefully somebody still reads this forum 8*)

I am generating a MetaFlight terrain skin using CTS in an attempt to replace one built by TerraVista.  the T.V. terrain skin appears to have the correct elevations - it correctly matches the real world terrain/contour maps.  Elevations range from ~1200m up to 4,000m.  Source is a UTM projected GeoTIFF sliced out of the mosaicked DTED2.

the CTS terrain is mostly flat, with most elevation ranges between 1500 and 1850m.  there are a couple of mountainous looking things in the distance, but they are not the correct features.  I have processes using the source DTED2 and both a UTM projected and a lat-lon version of the GeoTIFF.  Simple correllation testing in lynx reveals that the DTED and GeoTIFF give me the identical terrain skin - it is just wrong - does NOT match real world contour maps.

Any ideas as to what casues the terrain to be there but incorrect?  horizontal posting not correct or something?

Changing my loging username to “IdiotBoy”  I had N38.25 instead of N39.25 as my origin when I chopped out my 100Km of terrain for the tiff, and the N37 and N38 DTED files in the general list.  So - it built the very southern edge of the DB with good terrain (the realistic hills in the distance) but the rest using the default background dem.

Note - I tried to remove the background DEM and the process wouldn’t let me.  Had it let me remove it, and I produced a terrain with flat zero elevation, I probably would have tracked this down earlier.

This time it came out looking like a bunch of cells, a square honecomb, with gridded lines of elevation matching the low res terrain.  Very interesting effect, but not exactly what I want or need ......