[MetaCRS] Vertical Coordinate Systems in .las, GeoTIFF and WKT

[Norm Olsen]

I would say that Ellipsoidal Height vs Geoid Height is an important concept, especially for LIDR.  I've had several real world users who are very concerned about this issue.

Norm


-----Original Message-----
From: metacrs-bounces at lists.osgeo.org [mailto:metacrs-bounces at lists.osgeo.org] On Behalf Of Martin Desruisseaux
Sent: Tuesday, January 12, 2010 12:09 PM
To: metacrs at lists.osgeo.org
Subject: Re: [MetaCRS] Vertical Coordinate Systems in .las, GeoTIFF and WKT

Hello Frank

Le 11/01/10 19:50, Frank Warmerdam a écrit :
> The support for vertical coordinate systems is already covered in the
> OGC CT specification (01-009) and the GeoTIFF specification, but in my
> opinion little use has been made of this in the past. So I'm interested
> in feedback on my approach, and I'm hoping it can help as we move to
> support vertical coordinate systems more widely in GeoTIFF, and other
> coordinate system projects.
>
> http://liblas.org/wiki/VerticalCS

Would you like some details about the ISO 19111 (the successor of OGC 01-009) 
perspective? ISO 19111 handles the vertical dimension in the same way than OGC 
01-009, except in the particular case of ellipsoidal height (CS_VD_Ellipsoidal : 
2002). If the goal is only to get a working library, OGC 01-009 is a simplier 
approach. If there is some interrest in the theory, the ISO 19111 approach is 
worth a discussion. Would you like me to ellaborate?

	Regards,

		Martin
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