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

[Andrea Peri]

Hi,

I resolve my troubles.

The geotiff as generate from gdal seem to be the minimal necessary
tags for a geotiff.
I tested the production using geotifcp tool and compare the with that
produced using gdal. They are the same.
So I guess the gdal tags are the minimal necessary to have a good geotiff.
And the geotiff is correct.

Sorry for noise,

Andrea.


2014-08-02 23:48 GMT+02:00 Andrea Peri <aperi2007 at gmail.com>:
> 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)
>
> -----
>
> 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,
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -----------------



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