[Gdal-dev] Error reading ArcInfo Grid

[Frank Warmerdam]

Matthew Perry wrote:
> Hey folks,
> 
> Trying to import an ArcInfo Grid into grass and I'm getting a bunch
> of the following errors:
> 
> ERROR 1: IReadBlock failed at X offset 0, Y offset 5399
> ERROR 1: GetBlockRef failed at X block offset 0, Y block offset 5399
> 
> Strangely enough, the import proceeds but I get some wierd results!
> (see attached image)
> 
> I experience the same errors using other gdal utilities as well. I've
> found a few other mentions of this issue but no solutions yet..
> http://permalink.gmane.org/gmane.comp.gis.gdal.devel/1643
> 
> So far the only thing able to open the grid properly is ArcGIS. So I'm
> guessing that this grid has some strange issues that the gdal driver
> doesn't handle. If anyone's interested in helping debug this, i've
> posted the grid at
> http://ebm.nceas.ucsb.edu/mapping/data/rasters_bad.zip

Matthew,

I downloaded and tried this dataset and it seemed to work ok for me.
Could you perhaps try it with FWTools 1.0.5?  I imagine it was a compression
type that was fixed since the version of GDAL you are using.

Looking through the code it seems like the last improvement in that code
was in late 2005, so I presume GDAL 1.3.2 should work too.  Let me know
if you see the problem with FWTools 1.0.5. Otherwise I think we can
"write it off" as an already fixed problem.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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