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FSXA Airport elevation fix

L

luisr

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27
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germany
Hi,

I've downloaded a 10m mesh for the Hawaii islands. But at Kalaupapa Airport, the standard exclude-autogen/flatten/grass polygon is now located deeper than the new terrain.
So there's a about 20 feet deep hole and PHLU sits inside it. I want to fix the airport elevation so it fits the new mesh perfectly. I tried to create a new airport called PHLX with a new elevation. This is how it looks like in ADE:

422adeelevfix.jpg


The green rectangle is a Airport Background Flatten polygon.
But actually, it doesn't work as I expected:

419adeelevfix2.jpg


What's wrong about this method?
 
For FSX - under the ADE Tools Menu select "Change Airport Altitude"

If the background polygon leaves the hold in place - you need to create a small polygon on the old background which is set to exclude airport background, flattens and map class map - then create a new background polygon.
 
I think I know that kind of picture, most of my airports deal with hills :)

Befor you try to do something else: Are you sure that AGL is correct?
Try (from stock):
a) a cessna 172
b) a DC3
c) something else

in "y" mode.

You might get different elevations

Trial and error to find the correct AGL, sometimes it needs the 0.xxx digits.
Good indicators can "ad interim" be taxiways 90 degrees connected to the runway. If they show up correctly you got AGL.
P.S. As You cannot dig holes in FS you cannot place your flatten ploygon "to deep" into the scenery.
 
Last edited:
When you check the elevation with an aircraft - the elevation you see on the FS screen is the eyepoint.

You can subtract the eyepoint value from the aircraft.cfg file to get the actual elevation of the airport.
 
If you are using ADE then, when connected to FS, the red display gives the accurate ground elevation. If you are not using ADE then you should use TCalc to establish this value.
 
scruffyduck said:
If you are using ADE then, when connected to FS, the red display gives the accurate ground elevation. If you are not using ADE then you should use TCalc to establish this value.
Click to expand...

Not if there is an airport background active ;)
 
Golf-HotelDelta said:
Not if there is an airport background active ;)
Click to expand...

Which ADE or TCalc? and Why? ADE reads the ground elevation directly from FS - I would expect that to be at an airport background poly level if one is present.....
 
I've set the elevation in the Tools menu and added a Exclude Airport Flatten polygon. The runway etc. is now elevated correctly, but the whole airport is floating and there's still this hole.
 
scruffyduck said:
Which ADE or TCalc? and Why?
Click to expand...

Both get the elevation from FSX and if an airport background is present, this will modify the ground height.

The poster showed that he had a hole, so the returned height would be that of the hole and not the "ground" (mesh) height.
 
Try this:

1. remove all addon airport files you night have created.
2. Open the stock airport in ADE. Create a terrain exclusion poly for the airport background, compile, and put the "cvx" bgl file into active scenery folder.
3. Start FSX and slew around the airport, either connect to ADE or use TCalcX. Read out elevations and take some notes. In particular look at locations off the ends of all runways.
4. Using this info, determine best size for the new flatten and best elevation. This may need some trial and error. Often better to make flatten smaller and close to the highest nearby elevation at runway end. Create the new flatten and set its elevation (recommend accuracy to .001 meter). Compile again (now the cvx bgl has both the exclusion and your new flatten) and replace your first cvx file.
5. Start FSX and again slew around, looking for any cliffs, or sloped areas you need flat (like under a terminal). Repeat as necessary to fine tune.
6. When happy use the ADE airport elevation tool to set airport .001-.002 m above your flatten. Create any additional airport background polys needed with maskclassmap or excludeautogen properties. Compile and the airport elevation stub will be installed by ADE into scenery\world\scenery and manually install the new ADE and cvx files.

scott s.
.
 
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