[Geotiff] Projection Linear Units and Ellipsoid:

Reznik, Aleksandr AReznik at weather.com
Wed Jan 21 12:24:23 PST 2009


I have a what appears to be a GeoTiff with the following info from

   Version: 1
   Key_Revision: 1.0
      ModelTiepointTag (2,3):
         960              540              0
         0                4255742.32       0
      ModelPixelScaleTag (1,3):
         3178.84637       5651.28243       0
      GTModelTypeGeoKey (Short,1): ModelTypeProjected
      GTRasterTypeGeoKey (Short,1): RasterPixelIsArea
      GTCitationGeoKey (Ascii,16): "SELibs Geo Util"
      GeographicTypeGeoKey (Short,1): GCS_WGS_84
      GeogCitationGeoKey (Ascii,7): "Sphere"
      GeogGeodeticDatumGeoKey (Short,1): Datum_WGS84
      GeogLinearUnitsGeoKey (Short,1): Linear_Meter
      GeogAngularUnitsGeoKey (Short,1): Angular_Degree
      GeogEllipsoidGeoKey (Short,1): Ellipse_Sphere
      GeogSemiMajorAxisGeoKey (Double,1): 6378137
      GeogSemiMinorAxisGeoKey (Double,1): 6378137
      ProjCoordTransGeoKey (Short,1): CT_Mercator
      ProjFalseEastingGeoKey (Double,1): 0
      ProjFalseNorthingGeoKey (Double,1): 0
      ProjCenterLongGeoKey (Double,1): -95.34
      ProjCenterLatGeoKey (Double,1): 38.23

Projection Method: CT_Mercator
   ProjNatOriginLatGeoKey: 38.230000 ( 38d13'48.00"N)
   ProjNatOriginLongGeoKey: -95.340000 ( 95d20'24.00"W)
   ProjScaleAtNatOriginGeoKey: 1.000000
   ProjFalseEastingGeoKey: 0.000000 m
   ProjFalseNorthingGeoKey: 0.000000 m
GCS: 4326/WGS 84
Datum: 6326/World Geodetic System 1984
Ellipsoid: 7035/(unknown) (6378137.00,6378137.00)
Prime Meridian: 8901/Greenwich (0.000000/  0d 0' 0.00"E)

Corner Coordinates:
Upper Left    (-3051692.513,7307434.834)
Lower Left    (-3051692.513,1204049.807)
Upper Right   (3051692.513,7307434.834)
Lower Right   (3051692.513,1204049.807)
Center        (      0.000,4255742.321)

I am wondering what is missing in the Ellipsoid field (unknown) part and
how to get that into this file and also how do I encode the Projection
Linear Units, I want it to be 9001/metre.


-----Original Message-----
From: geotiff-bounces at lists.maptools.org
[mailto:geotiff-bounces at lists.maptools.org] On Behalf Of Frank Warmerdam
Sent: Monday, January 12, 2009 1:01 PM
To: Chris 'Xenon' Hanson
Cc: geotiff at lists.maptools.org; Norm Olsen
Subject: Re: [Geotiff] GeoTIFF Examiner

Chris 'Xenon' Hanson wrote:
>   It has been brought to my attention that Mentor Software, makers of
(among other things)
> the highly useful GeoTIFF Examiner utility for Windows, has been
bought by AutoDesk and
> their site is now gone. This means one cannot download GTE anymore.
>   I still have a copy of GeoTIFF examiner, but I don't think it's
legal for me to
> redistribute it at this point. However, it's a real bummer that it
will no longer be
> available.
>   Does anyone here have any insight on who might be in charge of this
property now? I've
> dealt with AutoDesk before, and they are so large as to be very
frustrating to start "at
> the front door". I'd like to seek approval from them to provide a
mirror where users can
> download GTE once again.


I think we can just ask Norm about the status of GeoTIFF Examiner
(cc:ed).  I
imagine he can confirm, or pass on a request allowing redistribution of
GeoTIFF Examiner.

I have cc:ed Norm.

I'd be happy to hold a copy for distribution on the geotiff download
if it is helpful.

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam,
warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent

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