Hi Dave, the error is from the last step, when adding overviews. Overviews help to to scale the map faster.
Anyway this step fails. Why I can't tell. Your GDAL version is pretty old. Maybe it's because of that. If you select no overview you should bypass this step. HTH Oliver > Evening all, > > A question to you from a not very experienced QLGT user! > > I have scanned 3 pieces of 2 Japanese 1:50000 maps & put them together > as one sheet in GIMP. This I have saved as a .tiff file. > > I have opened this file in QLGT & am trying to "do" the geo ref, but > cannot - every time I try it I get the same set of messages.... Sadly, > I don't appear to have anything other than the QLGT frame with error > explanations. > > (Running Fedora 16 with KDE, QLGT 1.5.1, QT Library 4.8.2, GDAL Library > GDAL 1.7.3, Proj4 Library 470) > > So, here is what I have done so far: > > Step 1, gave the name of my map file ending in .tif > accepted the output file of same name, ending _ref.tif > set projection as +proj=utm +zone=52 > left mode as linear (3 ref pts) > clicked on overviews 2x (--no idea what difference it makes > whether I click 2,4, 8, 16 or 32x) > > Step 2, > Ref projection is given as: > +proj=longlat +a=6378137.0000 +b=6356752.3142 +towgs84=0,0,0,0,0,0,0,0 > +units=m +no_defs > > set following points: > Aso eki 694470 3646273 1926 1744 > Miyaji eki 697997 3646304 2757 1753 > Aso san ropeway 694079 3639881 1806 3237 > Nakamatsu eki 692230 3634019 1344 4617 > > Click on <Start Process> > > Step 3 Process gives following: > > /usr/bin/gdal_translate -a_srs +proj=utm +zone=52 -gcp 1926 1744 > 694470.000000 3646273.000000 -gcp 2757 1753 697997.000000 3646304.000000 > -gcp 1806 3237 694079.000000 3639881.000000 -gcp 1344 4617 692230.000000 > 3634019.000000 /home/Dave/Desktop/Garmin/Aso_3_part_01.tif > /tmp/qt_temp.K15235 > Input file size is 3508, 4960 > 0...10...20...30...40...50...60...70...80...90...100 - done. > > > /usr/bin/gdalwarp -order 1 -r cubic -dstnodata "255" /tmp/qt_temp.K15235 > /tmp/qt_temp.M15235 > Creating output file that is 3599P x 5035L. > Processing input file /tmp/qt_temp.K15235. > Using band 4 of source image as alpha. > Using band 4 of destination image as alpha. > 0...10...20...30...40...50...60...70...80...90...100 - done. > > /usr/bin/gdal_translate -co tiled=yes -co blockxsize=256 -co > blockysize=256 -co compress=deflate /tmp/qt_temp.M15235 > /home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif > Input file size is 3599, 5035 > 0...10...20...30...40...50...60...70...80...90...100 - done. > > /usr/bin/gdaladdo -r cubic --config COMPRESS_OVERVIEW JPEG > /home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif 2 > 0...10...20...30.. > > ERROR 1: ZIPDecode:/home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif: > Decoding error at scanline 384, incorrect header check > ERROR 1: TIFFReadEncodedTile() failed. > ERROR 1: ZIPDecode:/home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif: > Decoding error at scanline 512, incorrect header check > ERROR 1: TIFFReadEncodedTile() failed. > > ERROR 1: ZIPDecode:/home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif: > Decoding error at scanline 896, incorrect header check > ERROR 1: TIFFReadEncodedTile() failed. > ERROR 1: ZIPDecode:/home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif: > Decoding error at scanline 1024, incorrect header check > > ERROR 1: TIFFReadEncodedTile() failed. > > ERROR 1: ZIPDecode:/home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif: > Decoding error at scanline 1408, incorrect header check > ERROR 1: TIFFReadEncodedTile() failed. > > ERROR 1: ZIPDecode:/home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif: > Decoding error at scanline 0, incorrect header check > ERROR 1: TIFFReadEncodedTile() failed. > > ERROR 1: ZIPDecode:/home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif: > Decoding error at scanline 384, unknown compression method > > ERROR 1: TIFFReadEncodedTile() failed. > > (Many, many more of the same) > > > ERROR 1: ZIPDecode:/home/Dave/Desktop/Garmin/Aso_3_part_01_ref.tif: > Decoding error at scanline 0, incorrect header check > ERROR 1: TIFFReadEncodedTile() failed. > 50...60...70...80...90...100 - done. > Overview building failed. > > ERROR 6: WriteBlock() not supported for this dataset. > > Failed! > > > Can anyone help me to get past these errors?????? > > > Many thanks > > Dave > > > ------------------------------------------------------------------------------ > Don't let slow site performance ruin your business. 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