[OSGeo Africa] Field mapping GPS suggestions please

[Wilhelm Herbst]

Optron, who are the suppliers of Trimble in SA,  will provide you with a handheld GPS with differential capabilities with sub meter (or even better if you want to spend more money) capabilities.

From: africa-bounces at lists.osgeo.org [mailto:africa-bounces at lists.osgeo.org] On Behalf Of Dean Ollis
Sent: Wednesday, 20 May, 2015 1:52 PM
To: africa at lists.osgeo.org
Subject: Re: [OSGeo Africa] Field mapping GPS suggestions please

Hi, Taryn

For the accuracy of 1m2 that you are aiming for, I don't think that a mobile phone or a hand-held GPS (no matter what brand!) are going to do the job. I am not a surveyor, but I think that you are going to need to at least use a differential GPS to get that sort of accuracy.

Maybe a surveyor on the list can provide you with advice as to the most cost effective way to delineate the habitat units that you are trying to map.

Kind regards

Dean

-----------------------------------------------------------
Dean Justin Ollis Pr.Sci.Nat.
The Freshwater Consulting Group


------- Original message -------
Subject: Re: [OSGeo Africa] Field mapping GPS suggestions please
From: Chris Berens
To: Africa Local Chapter Discussions
Date: 2015/05/20 - 11:20




Mobile phone GPS may give you an accuracy of 25m if you are lucky.

Maybe just draw your special areas in by hand on a 1:1000 field map

with a pencil crayon.

For mobile GIS/GPS try HGIS from Starpal, it will only run on a

Windows mobile OS but the demo works for free in Africa for

Environmental projects. Otherwise if you find an android device with a

decent clock you can run QGIS Android version.

Chris Berens

PLATO GISc 1308

www.mapland.co.za<http://www.mapland.co.za>

+27 (0)82 567 9322





On 20 May 2015 at 10:27, Gerhardus Geldenhuis

<gerhardus.geldenhuis at gmail.com><mailto:gerhardus.geldenhuis at gmail.com> wrote:

Hi,

I am no expert but I can't imagine that a mobile phone will be equivalent in

accuracy to something like a Trimble. You most certainly pay for the brand

but you also pay of the more accurate internal clock that plays a crucial

part in the error margin. I have used a Garmin 60CSx with a lot of success

doing Geological mapping. If you add an external antenna that could also

help with accuracy.



Regards



On 20 May 2015 at 08:21, Taryn Riddin <taryn.riddin at live.co.za><mailto:taryn.riddin at live.co.za> wrote:



Good day



Is anyone able to give me some advice please on choosing a GPS setup to

map estuarine habitats in the field?  Our SA estuaries are often very narrow

(1 to 2 km wide) and habitats small.  We distinguish between supratidal salt

marsh, intertidal salt marsh, reeds and sedges, among other habitats.  Reeds

and sedges often form a very narrow band along an estuary.  Accuracy needs

to be as close as possible to 1 m2, perhaps even better.



Someone suggested using a windows / android phone running ArcGIS Collector

as the GPS in them is as good as a Trimble and also cheaper?  It could also

be a separate GPS linked to a tablet, not necessarily a single hand help GPS

unit with mapping options.  We use ArcGIS software for final map productions

and analysis.



I am not very clued up on these aspects so any advise would be greatly

appreciated.



Many thanks in advance,

Taryn





________________________________

Research Associate - Botany Department

Nelson Mandela Metropolitan University

P.O. Box 77000

Port Elizabeth

6070



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Gerhardus Geldenhuis



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