[OSGeo Africa] Field mapping GPS suggestions please

Wed May 20 05:06:44 PDT 2015

Hi Taryn,
             A smartphone alone will give you a best accuracy of 5m and not
all the time. To get a submeter accuracy you have to invest in a survey
grade device and they are costly. Here's nice read with cost estimate.

http://www.resource-analysis.com/Services/GPS

Regards,

Losso Ekolo

On Wed, May 20, 2015 at 1:54 PM, Wilhelm Herbst <wherbst at optron.com> wrote:

>  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
>
> +27 (0)82 567 9322
>
>
>
>
>
> On 20 May 2015 at 10:27, Gerhardus Geldenhuis
>
> <gerhardus.geldenhuis at gmail.com> <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> <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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