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Thalixte avatar image
Thalixte asked Thalixte commented

Is there a DEM height data margin ?

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:

1653045898418.png

1653045930297.png

It seems to work as intended, except that the generated height data seem to be 50 meters below the sea level:

<Rectangle parentGroupID="1" width="405.6437683105469" falloff="100" surface="{47D48287-3ADE-4FC5-8BEC-B6B36901E612}" priority="0" latitude="48.6309814453125" longitude="-2.05169677734375" altitude="-157.29967510700226" latitude2="48.63372802734375" longitude2="-2.05169677734375" altitude2="-157.29967510700226">
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If i add 50 meters to my height data, it seems to be correct:

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  </Rectangle>
  <Group displayName="GEDOT_generated_height_maps" groupIndex="1" groupID="1" groupGenerated="TRUE" />


So my question is: is there a specific margin for DEM height data (for watermasking purpose, for instance) ?

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1653045898418.png (1.2 MiB)
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Gjanosh61 avatar image
Gjanosh61 answered Thalixte commented

Hello Thalixte,

This depends on your DEM data source. The value of 18.018150210380554 m referred to the geographical coordinates latitude = "48.6309814453125" longitude = "-2.051696777734375" is the height (h) referred to the ellipsoidal height, to have the orthometric height referred to your point of interest you must add +/- the Height on the Geoid (N).

GeoidEval


Inside the SDK documentation you will find this:
https://docs.flightsimulator.com/html/Content_Configuration/Environment/Airports_And_Facilities/Airport_Definition_Properties.htm?rhhlterm=geoid&rhsearch=geoid

altType This is used to determine the referential for the alt field.

GEOID

ELLIPSOID

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Thks a lot for this answer. I understand now the difference i obtained.
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