shrug-l: Data management

[Jordan,Jonathan D]

IMHO...don't believe any sales talk regarding standalone handhelds with
"submeter accuracy"...a realtime-readout unit capable of real-world
submeter performance is probably going to be a rover requiring some sort
of base-station/repeater link.  A major issue for you may be to further
define your accuracy and readout specs--realtime vs postproc,
base-station link or no such link, error in terms of 2drms or looser
spec, special field conditions (trees), etc.   

The standalone WAAS-enabled handhelds have not impressed me much under
typical FL field conditions (secondary-growth trees, high brush).
Precision-ag WAAS units are more fuss to rig for backpack (meant for
rolling-stock), but far better performance if realtime-readout and
keep-on-trucking update speed is required (mobile-mapping).  For
realtime readout, I never trust a singular unit, but where possible I
take along both WAAS and USCG-beacon units and check their readouts at a
benchmark before starting a days mobile-mapping fieldwork.  Common
obstacles to the use of such units include powerlines, substations,
hills, and big metal buildings.  

Good hunting.

Sincerely,

Jonathan Jordan
UF-IFAS-CRS


-----Original Message-----
From: shrug-l-bounces at lists.dep.state.fl.us
[mailto:shrug-l-bounces at lists.dep.state.fl.us] On Behalf Of Christine
Smith
Sent: Tuesday, April 04, 2006 6:29 PM
To: shrug-l at lists.dep.state.fl.us
Subject: RE: shrug-l: Data management

Hello SHRUGGIES,

I am in the market for a handheld GPS unit with submeter accuracy.  Does

anyone have any recommendations, warnings, anecdotes?

Thank you,
Christine

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