[Gdal-dev] srtm and gdaladdo question

[William Kyngesburye]

I ran into the same problem a while back - what version of libtiff is  
your gdal built with?  I found that when going from tiff 3.7.4 to  
3.8.0 (still there at 3.8.2) I started getting these block errors at  
higher overview levels.  This is with grey-scale images (like SRTM),  
with color images I get bus errors.

I've been meaning to submit a bug report, but I don't know if it's  
libtiff of GDAL (seems to be libtiff, from the thread trace), and I  
never heard anything from my posts on this list.


On Jun 12, 2006, at 10:21 AM, Kralidis,Tom [Burlington] wrote:

>
> Hi,
>
> I am trying to generate a set of SRTM data via gdaltindex, for use  
> with
> MapServer, which has worked with no problems.
>
> The next challenge is ensure they are displayed efficiently in
> MapServer, where I have taken the following steps:
>
> - run gdaltindex
> - run gdaladdo on each image
>
> When I try to run gdaladdo, I encounter the following issues:
>
> Sample image:
> ftp://ftp.glcf.umiacs.umd.edu/glcf/SRTM/Degree_Tiles/n045/ 
> SRTM_u01_n045w
> 086/SRTM_u01_n045w086.tif.gz
>
> $ gdaladdo -r average SRTM_u01_n045w086.tif 2 4 8 16 32
>
> ...
>
> ERROR 1: IReadBlock failed at X offset 0, Y offset 11
> ERROR 1: GetBlockRef failed at X block offset 0, Y block offset 11
> 91ERROR 1: SRTM_u01_n045w086.tif:DumpModeDecode: Not enough data for
> scanline 0
> ERROR 1: TIFFReadEncodedTile() failed.
>
> ERROR 1: IReadBlock failed at X offset 0, Y offset 12
> ERROR 1: GetBlockRef failed at X block offset 0, Y block offset 12
> .ERROR 1: SRTM_u01_n045w086.tif:DumpModeDecode: Not enough data for
> scanline 0
> ERROR 1: TIFFReadEncodedTile() failed.
>
> ERROR 1: IReadBlock failed at X offset 0, Y offset 13
> ERROR 1: GetBlockRef failed at X block offset 0, Y block offset 13
> ERROR 1: SRTM_u01_n045w086.tif:DumpModeDecode: Not enough data for
> scanline 0
> ERROR 1: TIFFReadEncodedTile() failed.
>
> ERROR 1: IReadBlock failed at X offset 0, Y offset 14
> ERROR 1: GetBlockRef failed at X block offset 0, Y block offset 14
>
> ...
>
>
> Any idea what's going on?
>
> Thanks
>
> ..Tom
>
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-----
William Kyngesburye <kyngchaos at kyngchaos.com>
http://www.kyngchaos.com/

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