Graeme, "gdalinfo -stats dtm.tif" shows "Min=1093360681.000 Max=3351465984.000" for the pixel values. That would mean you are asking for 225810530 levels; lots of tightly placed contours. I don't think Shapefile format can accommodate a vector datasource of that size. Based on the histogram, it's better to use the -fl option with gdal_contour.
On Mon, Oct 24, 2011 at 11:27 AM, Graeme Merrall <[email protected]>wrote: > You can download it from http://dl.dropbox.com/u/5657619/dtm.tif Only > 9.6Mb > > Cheers, > Graeme > > > On Mon, Oct 24, 2011 at 3:02 PM, Chaitanya kumar CH < > [email protected]> wrote: > >> Graeme, >> >> Can you provide a small sample image for testing? >> >> >> On Mon, Oct 24, 2011 at 9:20 AM, Graeme Merrall <[email protected]>wrote: >> >>> Correction, the cmdline was "gdal_contour -a ELEL -i 10.0 dtm.tif >>> dtm-10m.shp" >>> >>> >>> >>> On Mon, Oct 24, 2011 at 1:58 PM, Graeme Merrall <[email protected]>wrote: >>> >>>> 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 < >>>> [email protected]> wrote: >>>> >>>>> Graeme, >>>>> >>>>> Can you try again with a much larger interval? >>>>> >>>>> On Thu, Oct 13, 2011 at 6:32 AM, Graeme Merrall <[email protected] >>>>> > 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 >>>>>> [email protected] >>>>>> http://lists.osgeo.org/mailman/listinfo/gdal-dev >>>>>> >>>>> >>>>> >>>>> >>>>> -- >>>>> Best regards, >>>>> Chaitanya kumar CH. >>>>> >>>>> +91-9494447584 >>>>> 17.2416N 80.1426E >>>>> >>>> >>>> >>> >> >> >> -- >> Best regards, >> Chaitanya kumar CH. >> >> +91-9494447584 >> 17.2416N 80.1426E >> > > -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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