Hi Larry:
FSUIPC is used by SBuilderX and most other FS utilities to read the FS internal value for
ground surface elevation directly below the user aircraft.
Rhumbaflappy's Terrain Calculator X (aka "TCalcX") version 3 is sometimes used to report on-screen the ground surface elevation and a few other values, and AFAIK is also used to insert those values into SBuilderX via "
Point from Aircraft".
http://www.ptsim.com/forum/viewtopic.php?p=6226
http://www.fsdeveloper.com/forum/resources/tcalcx.93/
NOTE: The compiled executable
TCalcX_003.exe is in the un-ZIP-ped folder path:
[path]\TCalcX_003_source\TCalcX_003\bin\x86\Release\
TCalcX_003.exe
IIRC, the method I recently described in another thread using SBuilderX for deriving elevation from the user aircraft coordinate Lat-Lon position actually inserts the terrain
ground surface elevation into a terrain poly vertex point
rather than the aircraft datum flight Altitude AGL or MSL (...and AFAIK ADE9X does the same).
http://www.fsdeveloper.com/forum/th...ground-textures-to-a-3d-terrain-model.436776/
It has been a while since I used that feature in SBuilderX, so I don't recall if that process actually requires one to force and keep the FinneyGround CrossHairs Plus (aka "CH+")
on-ground first via the {F1} function key on one's keyboard ...in FS
slew mode.
FYI: I instead personally use that excellent "CH+" aircraft scenery tool all the time via a proprietary executable utility which manually or semi-automatically also derives and logs the aircraft flight and ground surface altitude, Geographic coordinates, True heading and Magnetic variation, as well as various other FS internal values from FSUIPC offsets, and converts them to 13 decimal place floating point numbers.
That data is then processed for various uses as FS SDK source files via other utility functions in proprietary and commercial GIS software.
Hope this helps encourage a further test of that workflow to read / write the ground surface elevation into a FS utility work-space dialog.
GaryGB