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resample gets stuck

dave hoeffgen

dave hoeffgen

Resource contributor
Messages
1,439
Country
germany
Hi there,
I tried to convert a 32 bit geotiff containing grayscale LandClass information.
I tried directing the ChannelValue to the red channel.

Here is my full code:
Code: 
[Source]
Type                = GeoTIFF
SourceDir           = "imagery"
SourceFile          = "mask.tif"
Layer               = LandClass
Channel_Value       = 1.0
SamplingMethod      = Majority
MajorityMode        = Weighted

[Destination]
DestDir             = "[...]\Scenery"
DestBaseFileName    = "[...]"
DestFileType        = BGL
UseSourceDimensions = 1
The rest of the code is copied from the sdk examples with tweaked paths and names.

However after reading out the text from the INF file resample gets stuck. No crash, no error message, it just doesn't continue.
Does anybody know what I did wrong?

Thanks in advance,
Dave
 
DestDir = "[...]\Scenery"
DestBaseFileName = "[...]"
Click to expand...

Is this an example or do you actually have brackets in these lines? Don't have my FSX SDK but P3D has

Code: 
[Source]
Type                = GeoTIFF
SourceDir           = "SourceData"
SourceFile          = "ModifiedGlccSubset2.tif"
Layer               = LandClass
SamplingMethod      = Majority
MajorityMode        = Weighted

[Destination]
DestDir             = "Output"
DestBaseFileName    = LandClass_AutoWeightedMajority
DestFileType        = BGL
UseSourceDimensions = 1

shot in the dark.
 
ronh said:
Is this an example or do you actually have brackets in these lines? Don't have my FSX SDK but P3D has

Code: 
[Source]
Type                = GeoTIFF
SourceDir           = "SourceData"
SourceFile          = "ModifiedGlccSubset2.tif"
Layer               = LandClass
SamplingMethod      = Majority
MajorityMode        = Weighted

[Destination]
DestDir             = "Output"
DestBaseFileName    = LandClass_AutoWeightedMajority
DestFileType        = BGL
UseSourceDimensions = 1

shot in the dark.
Click to expand...
No, I don't have the brackets in the actual inf file and setting the layer to "imagery" starts the normal process (with a nonsense result of course)

It must have something to do with the 4 channel image and the value redirection.
 
Can you run gdalinfo on your geotiff file to see the file structure? Is it 4 channels? did you convert this file from something else?
 
I made the image myself (RGBA) and rasterized some shapefiles using gdal_rasterize.
I thought 'Channel_Value = 1.0' would fix the multichannel thing. :confused:
 
Is it just a very big file and is taking a long time to process? I'm not at my dev machine and it's been a while doing terrain stuff.

What about the NullValue parameter?
 
As I said it processes without problems when compiled as imagery (I did this as a test, the result does not make sense of course)
but when I set the layer entry back to LandClass the processing line won't even appear on the console, not even after hours.
I don't think it's the image's size as I already processed even larger images without any problem.
 
Hi Dave,

it might be the format. If it's an RGB saved as TIFF it should be 24-bit (8 bits per Channel) with source Type=TIFF. Make sure that the class values are the same in each band: 1/1/1, 2/2/2, etc. If you only have them in the red band then copy that band into Green and Blue as well (Layers menu).

Alternatively, use Indexed mode and save the file in .RAW format and change the .inf to Type=RAW.

Cheers, Holger
 
It was an RGB image with alpha channel.
now I managed to convert it to 8 bit grayscale and removed the channel redirection, still same result :confused:
 
Hi Dave,

something else to consider might be the image resolution. If it's a lot finer than the landclass-native QMID15 (xDim = 0.0146484375, yDim = 0.010986328125) then maybe the interpolation process gets overwhelmed. This wouldn't come into play when compiling as an image.

Cheers, Holger
 
HolgerSandmann said:
Hi Dave,

something else to consider might be the image resolution. If it's a lot finer than the landclass-native QMID15 (xDim = 0.0146484375, yDim = 0.010986328125) then maybe the interpolation process gets overwhelmed. This wouldn't come into play when compiling as an image.

Cheers, Holger
Click to expand...
Thanks for the tip, I'll try a lower one.
 
It worked now but I must have missed that LC can't go past level 5.
This makes it useless again for my purpose. :(

I tried to do LC as an alternative to hydro polygons because I can't get 3d vertices.
I described the problem here.
 
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