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GeoTiff types from ArcGIS and QGIS in NSD?

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#1
David Medeiros

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Anybody here an expert on GeoTiff formats? I'm working in Natural Scene Designer (NSD) using GMTED elevation data for the globe.

 

When I make a GeoTiff export from ArcGIS NSD won't open it. When I take that same GeoTiff and open in QGIS then 'Save As...' a new .tif I get a GeoTiff that NSD will SOMETIMES open. Meaning the output file may or may not be readable by NSD (not that the same file occasionally opens in NSD).

 

When I check file type info in PS they look the same: 16bit greyscale.

 

Anybody know what may be going on here?

 

David


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#2
Melita Kennedy

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What does listgeo or something similar say about working versus non-working versions?



#3
Daniel Huffman

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I've had the same sort of issue with Arc-exported TIFFs in Blender. What I've found useful is to open them in Photoshop, then save them as a new file. Seems to clean them up. Might work for you in this instance, too.



#4
Natural Graphics

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Import failure in NSD can either be an unsupported raster image compression format, or GeoTIFF tags that are not recognized by NSD. If you would like, you may send me one of the files that doesn't import and I can trace through it in the debugger and see where its failing.

 

Brett Casebolt

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#5
amtait

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Hi Brett,

 

Did anyone send you an Arc GeoTIFF that fails in NSD import? I can send you one if they didn't. I have had the same problem and I use a work around of opening the ArcGIS GeoTIFF in Global Mapper and resaving from there as a GeoTIFF, then it opens fine in NSD.

 

Alex


Alex Tait

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#6
Matthew Hampton

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From my experience working with these files and softwares, it seems to be the compression that's the issue.  Perhaps legacy software effects from the Lemple-Ziv Welch (LZW) patent?

 

I'm curious to know the results of testing and if the issue is compression.


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#7
CentralAmericaExpe

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Import failure in NSD can either be an unsupported raster image compression format, or GeoTIFF tags that are not recognized by NSD. If you would like, you may send me one of the files that doesn't import and I can trace through it in the debugger and see where its failing.

 

Brett Casebolt

Software Developer

Natural Graphics

 

David:

 

Natural Graphics is probably correct. The issue may be "private" GeoTIFF tags (the raster software generating the Geo section of the TIFF may have created non conforming tagsets). So, the GeoTIFF interchange efficacy has broken down.

 

You may want to bring up this issue with osgeo.org (ie. open a ticket). osgeo promotes interoperability of, in this case, geotiff, across numerous platforms (corporate and  <---> open source software platforms).

 

Cheers,

Derek-


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