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Hi Chaitanya (& all), I tried your nearblack comment, and got: nearblack -white -o 0394w.tif 0394.tif Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitati Warning 1: TIFFFetchNormalTag:ASCII value for tag "GeoASCIIParams" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitati Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitati Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitati Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitati Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitati Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitati Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitati ERROR 4: Creation of file 0394w.tif failed. I think I am having trouble understanding the setting/using of nodata values. I have now also downloaded and compiled gdal 1.8.0 (but nearblack remained on v1.7.3) on ubuntu 10.04 LTS, and recreated my vrt, to no improvement. To recap: I have 179 3*8bit RGB band aerial images that have been orthorectified. The resulting skewness in the images has created white slivers in the corners, and I am presuming that these white slivers are recognised as "nodata". (My first mistake?) I use the following to create a vrt: gdalbuildvrt -addalpha -hidenodata -srcnodata "255 255 255" -vrtnodata "0 0 0" -input_file_list files 177_untiled_orthos_nodata_180.vrt Thinking that the above will tell gdalbuildvrt that, for the input orthos, white should be recognised as 'nodata', and in the VRT, those white pixels should be converted to black, as nodata. Well, as you've guessed, it didn't happen this way, and I still have the white bits after mosaicking my VRT thus: gdal_translate -projwin -16000 -3520650 -13000 -3525650 177_untiled_orthos_nodata.vrt try1.tif I tried re-running gdalbuildvrt specifying -vrtnodata "255 255 255" (to match the input ortho files) and the outside border of my vrt turned white, but the slivers between the mosaicked orthos were still present. Please can someone show me the correct way to address this problem. I have included gdalinfo results for both an individual ortho, and for the vrt itself. Thanks & regards, Zoltan ********************************** GDALINFO on indicidual ORTHO **************************************** geograph@gs0:~/vrt_177$ gdalinfo --version GDAL 1.8.0, released 2011/01/12 geograph@gs0:~/vrt_177$ geograph@gs0:~/vrt_177$ geograph@gs0:~/vrt_177$ geograph@gs0:~/vrt_177$ gdalinfo /mnt/geo_lvm0/ngi_jobs/orthos_8bit/NGI_177_untiled_orthos/0003.tif Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "GeoASCIIParams" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Driver: GTiff/GeoTIFF Files: /mnt/geo_lvm0/ngi_jobs/orthos_8bit/NGI_177_untiled_orthos/0003.tif Size is 4840, 9547 Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "GeoASCIIParams" does not end in null byte Coordinate System is: PROJCS["Projection = Transverse Mercator", GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4326"]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",0], PARAMETER["central_meridian",27], PARAMETER["scale_factor",1], PARAMETER["false_easting",0], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]]] Origin = (-47885.500000000000000,-3486281.500000000000000) Pixel Size = (0.500000000000000,-0.500000000000000) Metadata: TIFFTAG_IMAGEDESCRIPTION=Orthophoto of Inner 0003 of Model 002003 TIFFTAG_SOFTWARE=uSMART TIFFTAG_XRESOLUTION=400 TIFFTAG_YRESOLUTION=400 TIFFTAG_RESOLUTIONUNIT=3 (pixels/cm) AREA_OR_POINT=Area Image Structure Metadata: INTERLEAVE=PIXEL Corner Coordinates: Upper Left ( -47885.500,-3486281.500) ( 26d29'45.49"E, 31d29'52.22"S) Lower Left ( -47885.500,-3491055.000) ( 26d29'44.66"E, 31d32'27.20"S) Upper Right ( -45465.500,-3486281.500) ( 26d31'17.19"E, 31d29'52.57"S) Lower Right ( -45465.500,-3491055.000) ( 26d31'16.40"E, 31d32'27.55"S) Center ( -46675.500,-3488668.250) ( 26d30'30.93"E, 31d31' 9.88"S) Band 1 Block=4840x1 Type=Byte, ColorInterp=Red Overviews: 2420x4773, 1210x2386, 605x1193, 302x596, 151x298, 75x149, 37x74 Band 2 Block=4840x1 Type=Byte, ColorInterp=Green Overviews: 2420x4773, 1210x2386, 605x1193, 302x596, 151x298, 75x149, 37x74 Band 3 Block=4840x1 Type=Byte, ColorInterp=Blue Overviews: 2420x4773, 1210x2386, 605x1193, 302x596, 151x298, 75x149, 37x74 Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations Warning 1: TIFFFetchNormalTag:ASCII value for tag "ImageDescription" does not end in null byte Warning 1: TIFFFetchNormalTag:ASCII value for tag "Software" contains null byte in value; value incorrectly truncated during reading due to implementation limitations geograph@gs0:~/vrt_177$ ******************************************************************************************************* ********************************** GDALINFO on individual VRT ******************************************* geograph@gs0:~/vrt_177$ gdalinfo 177_untiled_orthos_nodata_180.vrt Driver: VRT/Virtual Raster Files: 177_untiled_orthos_nodata_180.vrt /mnt/geo_lvm0/ngi_jobs/orthos_8bit/NGI_177_untiled_orthos/0003.tif /mnt/geo_lvm0/ngi_jobs/orthos_8bit/NGI_177_untiled_orthos/0005.tif [one, two, skip a few...] /mnt/geo_lvm0/ngi_jobs/orthos_8bit/NGI_177_untiled_orthos/0392.tif /mnt/geo_lvm0/ngi_jobs/orthos_8bit/NGI_177_untiled_orthos/0394.tif Size is 97430, 112568 Coordinate System is: PROJCS["Projection = Transverse Mercator", GEOGCS["WGS 84", DATUM["WGS_1984", SPHEROID["WGS 84",6378137,298.257223563, AUTHORITY["EPSG","7030"]], AUTHORITY["EPSG","6326"]], PRIMEM["Greenwich",0], UNIT["degree",0.0174532925199433], AUTHORITY["EPSG","4326"]], PROJECTION["Transverse_Mercator"], PARAMETER["latitude_of_origin",0], PARAMETER["central_meridian",27], PARAMETER["scale_factor",1], PARAMETER["false_easting",0], PARAMETER["false_northing",0], UNIT["metre",1, AUTHORITY["EPSG","9001"]]] Origin = (-48104.500000000000000,-3486058.000000000000000) Pixel Size = (0.500000000000000,-0.500000000000000) Corner Coordinates: Upper Left ( -48104.500,-3486058.000) ( 26d29'37.23"E, 31d29'44.93"S) Lower Left ( -48104.500,-3542342.000) ( 26d29'27.26"E, 32d 0'12.22"S) Upper Right ( 610.500,-3486058.000) ( 27d 0'23.13"E, 31d29'48.53"S) Lower Right ( 610.500,-3542342.000) ( 27d 0'23.26"E, 32d 0'15.89"S) Center ( -23747.000,-3514200.000) ( 26d44'57.72"E, 31d45' 1.34"S) Band 1 Block=128x128 Type=Byte, ColorInterp=Red Mask Flags: PER_DATASET ALPHA Band 2 Block=128x128 Type=Byte, ColorInterp=Green Mask Flags: PER_DATASET ALPHA Band 3 Block=128x128 Type=Byte, ColorInterp=Blue Mask Flags: PER_DATASET ALPHA Band 4 Block=128x128 Type=Byte, ColorInterp=Alpha geograph@gs0:~/vrt_177$ ******************************************************************************************************* On 2011-02-16 19:39, Chaitanya kumar CH wrote: Zoltan, -- =========================================== Zoltan Szecsei PrGISc [PGP0031] Geograph (Pty) Ltd. P.O. Box 7, Muizenberg 7950, South Africa. 65 Main Road, Muizenberg 7945 Western Cape, South Africa. 34° 6'16.35"S 18°28'5.62"E Tel: +27-21-7884897 Mobile: +27-83-6004028 Fax: +27-86-6115323 www.geograph.co.za =========================================== No virus found in this message. |
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