[gdal-dev] Need some info on geotiff tags missing

[Andrea Peri]

Hi,

I have transform many old tiff+tfw rasters using this gdal transformation:

gdal_translate -ot Byte -of GTiff -b 1 -a_nodata none -stats -co
COMPRESS=NONE -co INTERLEAVE=PIXEL -co PROFILE=GDALGeoTIFF -co
TILED=YES -co BLOCKXSIZE=256 -co BLOCKYSIZE=256 -co SPARSE_OK=TRUE -co
TFW=NO filein.tif fileout.tif

They are wrking correctly with qgis and with mapserver for several months.

Now I need to use this geotiffs with another program.
But this program say that these images are not realy GeoTiffs.

I test them using listgeos and have this result:

TIFFReadDirectory: Warning, Unknown field with tag 42112 (0xa480) encountered.
Geotiff_Information:
   Version: 1
   Key_Revision: 1.0
   Tagged_Information:
      ModelTiepointTag (2,3):
         0                0                0
         559417.445637    4927786.430528   0
      ModelPixelScaleTag (1,3):
         0.5              0.5              0
      End_Of_Tags.
   Keyed_Information:
      End_Of_Keys.
   End_Of_Geotiff.

Some people say me that this is not a true geotiff because are missing
several tags.
I reported a supposed response from a real geotiff:

Geotiff_Information:
    Version: 1
    Key_Revision: 1.0
    Tagged_Information:
       ModelTiepointTag (2,3):
          0                 0                 0
          673347            4298291           0
       ModelPixelScaleTag (1,3):
          1                 1                 1
       End_Of_Tags.
    Keyed_Information:
       GTModelTypeGeoKey (Short,1): ModelTypeProjected
       GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
       GTCitationGeoKey (Ascii,37): "NAIP 2012
m_3808409_sw_16_1_20120607"
       ProjectedCSTypeGeoKey (Short,1): PCS_NAD83_UTM_zone_16N
       PCSCitationGeoKey (Ascii,21): "NAD83 / UTM zone 16N"
       ProjLinearUnitsGeoKey (Short,1): Linear_Meter
       End_Of_Keys.
    End_Of_Geotiff.

PCS = 26916 (NAD83 / UTM zone 16N)
Projection = 16016 (UTM zone 16N)
Projection Method: CT_TransverseMercator
    ProjNatOriginLatGeoKey: 0.000000 (  0d 0' 0.00"N)
    ProjNatOriginLongGeoKey: -87.000000 ( 87d 0' 0.00"W)
    ProjScaleAtNatOriginGeoKey: 0.999600
    ProjFalseEastingGeoKey: 500000.000000 m
    ProjFalseNorthingGeoKey: 0.000000 m
GCS: 4269/NAD83
Datum: 6269/North American Datum 1983
Ellipsoid: 7019/GRS 1980 (6378137.00,6356752.31)
Prime Meridian: 8901/Greenwich (0.000000/  0d 0' 0.00"E)
Projection Linear Units: 9001/metre (1.000000m)

Corner Coordinates:
Upper Left    (  673347.000, 4298291.000)  ( 85d 0'12.06"W,
38d48'58.87"N)
Lower Left    (  673347.000, 4290632.000)  ( 85d 0'18.99"W,
38d44'50.54"N)
Upper Right   (  679532.000, 4298291.000)  ( 84d55'55.75"W,
38d48'54.41"N)
Lower Right   (  679532.000, 4290632.000)  ( 84d56' 2.92"W,
38d44'46.10"N)
Center        (  676439.500, 4294461.500)  ( 84d58' 7.43"W,
38d46'52.50"N)

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I'm a bit confused.
Because I have produced my GeoTiffs using gdal. And if it fail to
produce a real geotiff I have a trouble.

So the main question is a geotiff ith only the tags reported a real geotiff ?

Thx,

-- 
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Andrea Peri
. . . . . . . . .
qwerty àèìòù
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