[Geotiff] Orthophoto in Fathoms?

Tue Mar 13 14:17:03 EST 2007

I cannot re-create this error in the current version of IMAGINE (9.1).

The TIFF data created in the error example Chris documents below was
using an olde software. Note the date of the IMAGINE information states
"Copyright 1991 - 2001 by ERDAS, Inc." I vaguely remember a problem with
Fathoms being some kind of default in the TIFF creation in about IMAGINE
8.5, and a fix taking care of the problem before 8.6 was released.

At any rate, the error does not exist today. A file created with IMAGINE
9.1 will state: "Copyright 1991 - 2006 by Leica Geosystems Geospatial
Imaging, LLC."

As for ESRI, the old versions only read the TIFF World File and not the
GeoTIFF tags. I believe AV 3.3 was the first COT software ESRI made that
supported GeoTIFF. (Please correct me where needed folks.)

Paul

-----Original Message-----

From: geotiff-bounces at lists.maptools.org
[mailto:geotiff-bounces at lists.maptools.org] On Behalf Of Chris 'Xenon'
Hanson

Sent: Friday, March 09, 2007 1:07 PM

To: geotiff at lists.maptools.org

Subject: Re: [Geotiff] Orthophoto in Fathoms?

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 

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 

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.

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