[Liblas-devel] Vertical Datum Developments

[Mike Grant]

Hi Frank,

We're doing some work with vertical datums in the UK (Newlyn OSGB, etc)
and are experimenting with the svn proj for this (thanks for
implementing it!).  If we push anything out to end users, we'll need to
build static versions or bundle libraries.  So we're just wondering if
you have any plans for when this might go into a release / what remains
to be done?

Cheers,

Mike.

On 21/09/10 03:47, Frank Warmerdam wrote:
> 1) PROJ.4 has been upgraded to support a +geoidgrids= parameter which can
> reference one or more geoid files relating geoid heights to WGS84
> ellipsoidal
> heights.  These are used to transform back and forth to/from geoidal
> vertical
> datums like NAVD88.
> 
> 2) Some geoid files in the .gtx format have been assembled at the following
> url, notably US files from NOAA suitable for use for NAVD88 and global
> models from NGA suitable for approximating other geoidal coordinate systems
> world wide.
> 
>   http://download.osgeo.org/proj/vdatum