Sorry for my late response. Too much paperwork and errands after retiring per FAA regs (65th bday, CFR part 121.Air transport Pilot) Also, I forgot to mention this mesh scenery I am trying to create is not for FSX, but for FS9. Attached please find the files. You may find some that are not even required, but, I am trying. Thanks for bearing with me in my ignorance as a newbie fs scenery designer.
R
What you attached above is the scenery BGLs for an airport created via ADE.
Are you wanting to create a sloped flatten that blends the airport into the surrounding terrain mesh ?
If you do actually want to make custom terrain mesh for FS9, please be forewarned that what you propose to do in creating a custom terrain mesh for FS9 would involve massive amounts of data processing and work, and is a cumbersome task even for advanced users.
The resulting terrain when displayed in FS9 would be only slightly better than that using the default terrain mesh BGL(s) in FS9.
While there is a very highly detailed data set for Puerto Rico available since 2018, the size is massive at 1/2 Meter between elevation data points, which would require extensive system resources in terms of computer disk space, memory, and data processing time just to prepare the data for use with FS 2004 SDK Resample ...which then requires additional work to create terrain mesh BGLs for FS9.
Even after all that work, FS9 limits displayed terrain resolution to LOD-11 / 19.2 Meters between elevation data points (default terrain mesh shown)
Depending on your computer, you may be able to display the full 1/2 Meter resolution mesh data set on FSX and/or P3D (default terrain mesh shown)
However, I would recommend you consider treating yourself to a retirement gift, and buy a computer able to run MSFS 2020 (default terrain mesh shown)
GaryGB