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Loowit Sceneries update - FS Resample / QGIS issues, etc.

S

Steve Rosenow

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us-washington
So, I'm back after a hiatus, mostly brought forth by PC woes but also by research. I have a much better laptop now, and there's been some progress made to the project regarding Mount St. Helens and its pre-1980 appearance.

Last week, in what I thought was never going to ever happen, the USGS released a 10-meter mesh of Mount St. Helens and the entire Spirit Lake/North Fork Toutle River area. The mesh was an undertaking between the USGS and a student intern from the Portland (OR) Community College GIS and Geospatial Technologies program. The release of this mesh solves much of the issues I had been having previously with flattening the valley slope, and presents a much higher detail fidelity around Spirit Lake.

HOWEVER.
In the compilation of the mesh for FSX, there are, or IS, a problem. After compiling for FSX, where there is no mesh data in the GeoTIFF, it appears as a rather large "plateau." I could not remember how I resolved this issue nor could I find it in any previous thread.


Attached are screenshots.
The native projection is NAD83 UTM10, and was reprojected in QGIS to EPSG:4326 WGS84. For some reason, attempting to compile the BGL using the native NAD83 UTM10 GeoTiff results in Resample.exe failing to do so.


Also attached is the code in the *.INF file. These parameters worked in the past, but aren't now. Any suggestions?




[Source]
Type=GeoTIFF
Layer=Elevation
SourceDir="."
SourceFile="MSH_Pre_1980_test3.tif"
MinValidValue=344
NullCellValue=-32767

[Destination]
DestDir="."
DestBaseFileName="MSH_Pre_1980_Test"
DestFileType=BGL
LOD=6,16
FractionBits = 3
BaseValue = 1000


FSX1MSH.jpg
FSX2MSH.jpg
FSX2MSH_QGIS.jpg
 
Hi,

I think you will have to set the no data value in your INF file. So check which value is used in the GeoTIFF to specify no data and make sure you have that configured. That should probably fix it.
 
arno said:
Hi,

I think you will have to set the no data value in your INF file. So check which value is used in the GeoTIFF to specify no data and make sure you have that configured. That should probably fix it.
Click to expand...
I have tried setting no data parameter to 0.00 in QGIS during the export but all that does, is set the areas outside of the mesh itself to sea level, and instead of the slight cliffs on the west flank (seen above) they're now 4,000 foot high cliffs.

Under the no data column in QGIS for the reprojected mesh, it displays as 3.4e+38, which makes it even more confusing.
 
I'm not talking about no data in QGIS. You need to tell resample in the INF file what the no data value of your TIF is. Else it can not handle it correctly.
 
arno said:
I'm not talking about no data in QGIS. You need to tell resample in the INF file what the no data value of your TIF is. Else it can not handle it correctly.
Click to expand...
I did that in the INF file in several test attempts but was unsuccessful, hence why I posted.
 
You would have to check in QGIS what the value is and then put that value in your inf file. In the INF file you posted above I don't see any null value specified.
 
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