[OSGeo Africa] Field mapping GPS suggestions please
Wilhelm Herbst
wherbst at optron.com
Wed May 20 04:54:10 PDT 2015
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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