Vertical Datum Transformation

"Dan McCoy" <[email protected]>
Newsgroups gmane.comp.gis.freegis
Message-ID <s39076be.000@E_GWIA.cityofsacramento.org> 
Does anyone know of any tools for transforming NAVD29 elevations to NAVD88?

I've only been able to find VERTCON, but I don't think it would qualify as Free / Open Source:

"...This program is property of the Government of the United States of America. Therefore, the recipient further agrees not to assert proprietary rights therein and not to represent this program to anyone as being other than a Government program"
http://www.ngs.noaa.gov/PC_PROD/VERTCON/


Thanks,

Dan
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