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Mesh Shift

scubakobe

scubakobe

Messages
305
Country
us-california
Hi,

So far with all of the meshes I have tried to create they have been misplaced a few hundred feet. I'm not sure what the problem is, but it doesn't happen when I do 30M mesh. If I download 1" NED it works fine, but anything smaller such as 1/3 or 1/9 it doesn't get placed properly.

Does anyone have an idea as to why it is being misplaced?

Here are a few shots:

Default VS New Mesh


Ridgeline according to FS (wtih new mesh) placed in Google Earth, shows the offset:


Thanks,
Kobbe
 
Questions: What coordinate system are they? Are you using a Geotiff? Are you defining your coordinates in the resample inf?
 
It's WGS84 and I downloaded it as a BIL file so I can compile it for FS9. I didn't think you could use GeoTIFF with FS9, only FSX.

Here's my INF file:

Code: 
[Destination]
	LOD	= Auto
	DestDir		 = "C:\Documents and Settings\Owner\My Documents\.........."
        DestBaseFileName 	 = "mtnair_mesh"
	UseSourceDimensions = 1

[Source]
	Type			= ElevS16LSB
	SourceDir		= "C:\Documents and Settings\Owner\My Documents\..........."
	SourceFile		= "35563027.bil"
	Lat			= 36.26902778
	Lon			= -82.75421296
	NumOfCellsPerLine = 9870
	NumOfLines		= 9172
	CellXdimensionDeg = 0.00009
	CellYdimensionDeg = 0.00009
	ScaleinMeters	= 1.0
 
Hi Kobbe,

don't round the CellDimensionDeg, for the 1/3s data it is 1/(3600*3) = 0.0000925926. The rounded value 0.00009 causes big errors, in the meridian direction about 3 kilometers every degree.
Best regards

Vlada
 
Last edited:
Vlada,

Thanks for the information. I never knew how to calculate the cell dimensions for mesh. What I did was take what Global Mapper told me, .0009, since I didn't know how to calculate it exactly.

BTW, how would I do it for 1/9 second mesh? Is there a pattern for the formula?

I'll try out the updated INF file and let you know if it worked.

Thanks!
 
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