shrug-l: Elevation Unit Reference for NAVD88

Porter, William B. william.porter at
Thu Jul 12 08:22:58 EDT 2012

Contact Tom Watters at Beaches and Shores [DEP].  I no longer know his
number, but it would be in the state directory on line. 

Tom was the wizard of datums, benchmarks and elevations for this corner
of the universe.  I doubt he's been eclipsed. 


From: shrug-l-bounces at
[mailto:shrug-l-bounces at] On Behalf Of Thomas, Jim
Sent: Tuesday, July 10, 2012 8:50 AM
To: shrug-l at
Subject: shrug-l: Elevation Unit Reference for NAVD88


I all,


I have a survey question related to elevation units.  Since NAVD88 ZERO
and MSL Zero are not necessarily the same, is it wrong to express
elevation units that reference NAVD88 as 'FT AMSL'?  Or is 'ft' more


I've seen data stored this way and I would like to suggest the
appropriate unit.  





Jim Thomas, GISP | GIS Analyst | Golder Associates Inc.         
9428 Baymeadows Road, Suite 400, Jacksonville, Florida, USA 32256    
T: +1 (904) 363-3430 | F: +1 (904) 363-3445 | E: jim_thomas at
<mailto:jim_thomas at>  |

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