[gdal-dev] gdal_contour stuck in processing?

[Graeme Merrall]

Apologies for the delay in replying.

I ran the same command with 10m spacing "gdal_contour -a ELEL -i 1.0
dtm.tif dtm-10m.shp" and the same issue occurred.   I also ran the DTM
through gdal_translate to add projection info just in case. Note this is
gdal_1.8.1 running on Ubuntu Lucid not from deb's but a custom compile

The same symptoms occur, it gets to around 7% or so then hangs. Load goes
through the roof.

Ran it through strace and seems to get stuck in massive loop with calling
brk()

Cheers,
 Graeme

On Thu, Oct 13, 2011 at 4:03 PM, Chaitanya kumar CH
<chaitanya.ch at gmail.com>wrote:

> Graeme,
>
> Can you try again with a much larger interval?
>
> On Thu, Oct 13, 2011 at 6:32 AM, Graeme Merrall <graeme at inetix.com.au>wrote:
>
>> I'm trying out gdal_contour just to see what falls out of it as an
>> experiment.  I've noticed it seems to get to "0.."  e.g. 7% or so, and
>> then seems to hang.  I'm trying it on a relatively small DTM
>>
>> The cmdline is pretty simple "gdal_contour -a ELEL -i 1.0
>> dtm_11072101.tif dtm-1m.shp"
>>
>> and gdalinfo gives the following info  about the image
>> Driver: GTiff/GeoTIFF
>> Files: dtm_11072101.tif
>>      dtm_11072101.tfw
>> Size is 1000, 2500
>> Coordinate System is `'
>> Origin = (488000.000000000000000,7198000.000000000000000)
>> Pixel Size = (2.000000000000000,-2.000000000000000)
>> Metadata:
>>  TIFFTAG_XRESOLUTION=200
>>  TIFFTAG_YRESOLUTION=200
>>  TIFFTAG_RESOLUTIONUNIT=3 (pixels/cm)
>> Image Structure Metadata:
>>  INTERLEAVE=BAND
>> Corner Coordinates:
>> Upper Left  (  488000.000, 7198000.000)
>> Lower Left  (  488000.000, 7193000.000)
>> Upper Right (  490000.000, 7198000.000)
>> Lower Right (  490000.000, 7193000.000)
>> Center      (  489000.000, 7195500.000)
>> Band 1 Block=1000x2 Type=UInt32, ColorInterp=Gray
>>
>> I admit I'm at a loss as to how to proceed/troubleshoot so any
>> pointers gratefully received. I tried popping it through
>> gdal_translate to add a projection but it seems to have the same issue
>>
>> Cheers,
>>  Graeme
>> _______________________________________________
>> gdal-dev mailing list
>> gdal-dev at lists.osgeo.org
>> http://lists.osgeo.org/mailman/listinfo/gdal-dev
>>
>
>
>
> --
> Best regards,
> Chaitanya kumar CH.
>
> +91-9494447584
> 17.2416N 80.1426E
>
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