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...@gmail.com>wrote: > Graeme, > > Can you try again with a much larger interval? > > On Thu, Oct 13, 2011 at 6:32 AM, Graeme Merrall <gra...@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@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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