[MetaCRS] RE: New RFC -- Redesign of Datum Transform Engine

[Tom Fukushima]

Thanks Norm.


Date: Wed, 16 Jun 2010 10:44:19 -0700
From: Norm Olsen <norm.olsen at autodesk.com>
Subject: RE: [MetaCRS] RE: New RFC -- Redesign of Datum Transform
	Engine	(Norm	Olsen)
To: Tom Fukushima <tom.fukushima at autodesk.com>,
	"metacrs at lists.osgeo.org"	<metacrs at lists.osgeo.org>
Message-ID:
	<DE08CCCA7394E04EAA6B31C916E5E1D76FC26B363B at ADSK-NAMSG-02.MGDADSK.autodesk.com>
	
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Hello All . . .

I have added the following statement to the Implications section of the RFC.

"The proposed changes will not change the numeric results, nor will they change the performance of actual conversions.  The intent of these changes is to remove the dependence upon the WGS84 "pivot datum" model thus enabling more flexibility in defining datum conversions without having to change library code.  The performance of setting up a datum tranformation  (CS_dtcsu) will be negatively impacted, but the actual calulation of a datum shift will remain about the same."

Norm