Hello to all your fantastic MSFS/Asobo team 
First of all, thank you to
have included the polygon definitions in the scenery xml file instead of in
separate ESRI shapefiles. I can now generate dynamically my own exclusion and
terraforming polygons. that’s great ! I am now playing with the DEM height
data to dynamically generate height data maps inside the scenery xml file. To
do this, i made a python script to import my 3D tile in blender, create a grid
under this tile, then ray cast from the grid the bottom of the tile to create
height points. Here are some examples:
It seems to work as intended,
except that the generated height data seem to be 50 meters below the sea
level:
If i add 50 meters to my height data, it seems to be correct:
So my question is: is there a specific margin for DEM height data (for
watermasking purpose, for instance) ?