shrug-l: Elevation Unit Reference for NAVD88

Lewers, Shawn slewers at
Thu Jul 12 08:58:44 EDT 2012

I would be interested to k ownthe answer as well.

sent from Shawn Lewers' IPhone

On Jul 12, 2012, at 8:18 AM, "Porter, William B." <william.porter at<mailto:william.porter at>> wrote:

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> [mailto:shrug-l-bounces at] On Behalf Of Thomas, Jim
Sent: Tuesday, July 10, 2012 8:50 AM
To: shrug-l at<mailto: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 appropriate?

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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