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Any Ideas?

DXtrans

DXtrans

Messages
150
Country
us-idaho
Hi,

I think the best way to show my problem is to give my work flow and then illustrations of the outcome.

Workflow:

1. Download geotiff from usgs
2. reproject using fwtools: gdalwarp -t_srs "+proj=latlong +datum=WGS84" -of GTiff -co "INTERLEAVE=PIXEL" ___.tif ___.tif
3.Use resample to convert to bgl
inf:

[Source]
Type = GeoTIFF
SourceDir = "..."
SourceFile = "..."
Layer = Elevation
NullValue = 0,0,0

[Destination]
DestDir = "..."
DestBaseFileName = "..."
LOD = Auto


The pictures show the results of converting just imagery, just the terrain, and also the info after reprojecting the geotiff. Imagery results in mainly water and the terrain results in a hole. Not sure what's going on and would be grateful for any help. Thanks.
 

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Hi,

The inf you show is for the elevation data I assume, for imagery you will need to have a different one with type imagery.

The elevation looks weird, are you sure the units of the source image are meters?
 
Yeah, I just gave one inf example. As for the units I'm pretty sure they're in meters, but I'm having trouble confirming that. What's the best way to go about checking? I hope it's possible to change them if they're incorrect :).
 
According to USGS the elevation data is in units of meters. Something must be happening then during either reprojection or resampling. I haven't a clue what though?
 
The NullValue removes a black edge around the imagery that would otherwise appear.

I'm still trying to understand why even when I convert just the imagery a lot of water appears on it in the sim. Seems like it should just be converting the image and leaving it at that. So I'd be happy if even I could get the imagery to work. I guess if that problem was fixed the elevation would probably work too since the two problems seem to be related.
 
Hi,

I assume you have an alpha channel in your imagery. That channel then becomes a watermask. So either adjust the inf file to specify if the alpha channel is used for blend or water mask. Or remove the alpha channel from your imagery.
 
LCSims said:
Then why is in an INF file for elevation?
Click to expand...

I just leave it in there for when I want to compile imagery. Meaning I just switch the Layer value in the same inf for different compilations. So just a convenience, nothing to do with compiling elevation and it doesn't effect it if I leave it in there.
 
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