[Geotiff] Linear_Foot_Modified_American = 9004

[Max Martinez]

All previous changes are available in whatever version of the EPSG
database you are using. Examining the change report from the 6.14
version, you find that this unit was eliminated in July of 1998:

#933 1998.220 State Plane units
Report date: 21-Jul-98
Changed units for Clarke 1866 Michigan ellipsoid and all six NAD27
Comment:
Michigan State Plane zones from Modified American foot to US
Survey Foot. Deleted Modified American foot.
Action:
Codes affected: 7009 9004 12101-3 12111-3 26801-3 26811-3
Reporter: Melita Kennedy; ESRI
Tables affected: Ellipsoid HorizCS Trf_nonpoly UOM_length

-----Original Message-----
From: geotiff-bounces at lists.maptools.org
[mailto:geotiff-bounces at lists.maptools.org] On Behalf Of Christian Zietz
Sent: Thursday, April 10, 2008 4:35 AM
To: geotiff at lists.maptools.org
Subject: Re: [Geotiff] Linear_Foot_Modified_American = 9004

Mathieu.St-Pierre at bentley.com schrieb:

> I got a GeoTIFF image whose key GeogLinearUnitsGeoKey has the value
9004.
> It seems that this unit code is specified nowhere, not even in
> libgeotiff or the EPSG database.

> Why is it in the GeoTIFF specification? Where does it come from?

Since the libgeotiff includes and the specification are based on a very
old version of the EPSG database (v. 2.1), my guess is that the code
9004 was defined there and that it was removed in a later version of the
EPSG database.
Unfortunately I can't find such an old release of the EPSG DB to confirm
this.

Christian
-- 
Christian Zietz  -  CHZ-Soft  -  czietz at gmx.net
WWW: http://www.chzsoft.com.ar/
PGP/GnuPG-Key-ID: 0x6DA025CA
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