[Geotiff] Orthophoto in Fathoms?

[Chris 'Xenon' Hanson]

Chris 'Xenon' Hanson wrote:
>   I'm pestering the user to get the listgeo dump text sent to me so I 
> can share it here, but I don't have it yet.

   Moments after I hit send, the user sent me the listgeo dump. Fate is so predictable. 
Here it is. Interesting parts are:

ProjLinearUnitsGeoKey (Short,1): Linear_Fathom
"Units = other" in the GTCitationGeoKey (which nobody tries to parse, AFAIK)
Projection Linear Units: 9014/(unknown) (1.000000m)


   The corner coordinate values are correct for the area, if interpreted as meters.

   I did some Googling, and found much discussion about different programs handling (or 
not) these fields and it seems like maybe ESRI perhaps incorrectly ignores this field 
entirely, and therefore is (wrongly) immune to this problem caused by Imagine writing 
wacky units.

   I'm still not sure why Imagine got it in its head to use Fathoms though.



Geotiff_Information:
    Version: 1
    Key_Revision: 1.0
    Tagged_Information:
       ModelTiepointTag (2,3):
          0                0                0
          781169.1         3318029.4        0
       ModelPixelScaleTag (1,3):
          0.45             0.45             0
       End_Of_Tags.
    Keyed_Information:
       GTModelTypeGeoKey (Short,1): ModelTypeProjected
       GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
       GTCitationGeoKey (Ascii,216): "IMAGINE GeoTIFF Support\nCopyright 1991 - 2001 by 
ERDAS, Inc. All Rights Reserved\n@(#)$RCSfile: egtf.c $ $Revision: 1.10.1.6 $ $Date: 
2003/10/17 16:36:51EDT $\nProjection Name = UTM\nUnits = other\nGeoTIFF Units = other"
       ProjectedCSTypeGeoKey (Short,1): PCS_WGS84_UTM_zone_15N
       PCSCitationGeoKey (Ascii,205): "IMAGINE GeoTIFF Support\nCopyright 1991 - 2001 by 
ERDAS, Inc. All Rights Reserved\n@(#)$RCSfile: egtf.c $ $Revision: 1.10.1.6 $ $Date: 
2003/10/17 16:36:51EDT $\nUTM Zone 15N\nEllipsoid = WGS 84\nDatum = WGS 84"
       ProjLinearUnitsGeoKey (Short,1): Linear_Fathom
       End_Of_Keys.
    End_Of_Geotiff.

PCS = 32615 (name unknown)
Projection = 16015 ()
Projection Method: CT_TransverseMercator
    ProjNatOriginLatGeoKey: 0.000000 (  0d 0' 0.00"N)
    ProjNatOriginLongGeoKey: -93.000000 ( 93d 0' 0.00"W)
    ProjScaleAtNatOriginGeoKey: 0.999600
    ProjFalseEastingGeoKey: 500000.000000 m
    ProjFalseNorthingGeoKey: 0.000000 m
GCS: 4326/WGS 84
Datum: 6326/World Geodetic System 1984
Ellipsoid: 7030/WGS 84 (6378137.00,6356752.31)
Prime Meridian: 8901/Greenwich (0.000000/  0d 0' 0.00"E)
Projection Linear Units: 9014/(unknown) (1.000000m)

Corner Coordinates:
Upper Left    ( 781169.100,3318029.400)
Lower Left    ( 781169.100,3315251.550)
Upper Right   ( 783851.100,3318029.400)
Lower Right   ( 783851.100,3315251.550)
Center        ( 782510.100,3316640.475)


-- 
      Chris 'Xenon' Hanson | Xenon @ 3D Nature | http://www.3DNature.com/
  "I set the wheels in motion, turn up all the machines, activate the programs,
   and run behind the scenes. I set the clouds in motion, turn up light and sound,
   activate the window, and watch the world go 'round." -Prime Mover, Rush.