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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span lang="EN-US" style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> africa-bounces@lists.osgeo.org
[mailto:africa-bounces@lists.osgeo.org] <b>On Behalf Of </b>Dean Ollis<br>
<b>Sent:</b> Wednesday, 20 May, 2015 1:52 PM<br>
<b>To:</b> africa@lists.osgeo.org<br>
<b>Subject:</b> Re: [OSGeo Africa] Field mapping GPS suggestions please<o:p></o:p></span></p>
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<p class="MsoNormal">Hi, Taryn<br>
<br>
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. <br>
<br>
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.<br>
<br>
Kind regards<br>
<br>
Dean<br>
<br>
----------------------------------------------------------- <br>
<span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Dean Justin Ollis
<i>Pr.Sci.Nat.</i> <br>
<b>The Freshwater Consulting Group</b> <br>
</span><br>
<br>
------- Original message -------<br>
<b>Subject: </b>Re: [OSGeo Africa] Field mapping GPS suggestions please<br>
<b>From: </b>Chris Berens<br>
<b>To: </b>Africa Local Chapter Discussions<br>
<b>Date: </b>2015/05/20 - 11:20<br>
<span style="font-family:"Arial","sans-serif""> </span><o:p></o:p></p>
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<pre>Mobile phone GPS may give you an accuracy of 25m if you are lucky.<o:p></o:p></pre>
<pre>Maybe just draw your special areas in by hand on a 1:1000 field map<o:p></o:p></pre>
<pre>with a pencil crayon.<o:p></o:p></pre>
<pre>For mobile GIS/GPS try HGIS from Starpal, it will only run on a<o:p></o:p></pre>
<pre>Windows mobile OS but the demo works for free in Africa for<o:p></o:p></pre>
<pre>Environmental projects. Otherwise if you find an android device with a<o:p></o:p></pre>
<pre>decent clock you can run QGIS Android version.<o:p></o:p></pre>
<pre>Chris Berens<o:p></o:p></pre>
<pre>PLATO GISc 1308<o:p></o:p></pre>
<pre><a href="http://www.mapland.co.za">www.mapland.co.za</a><o:p></o:p></pre>
<pre>+27 (0)82 567 9322<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>On 20 May 2015 at 10:27, Gerhardus Geldenhuis<o:p></o:p></pre>
<pre><a href="mailto:gerhardus.geldenhuis@gmail.com"><gerhardus.geldenhuis@gmail.com></a> wrote:<o:p></o:p></pre>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<pre>Hi,<o:p></o:p></pre>
<pre>I am no expert but I can't imagine that a mobile phone will be equivalent in<o:p></o:p></pre>
<pre>accuracy to something like a Trimble. You most certainly pay for the brand<o:p></o:p></pre>
<pre>but you also pay of the more accurate internal clock that plays a crucial<o:p></o:p></pre>
<pre>part in the error margin. I have used a Garmin 60CSx with a lot of success<o:p></o:p></pre>
<pre>doing Geological mapping. If you add an external antenna that could also<o:p></o:p></pre>
<pre>help with accuracy.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Regards<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>On 20 May 2015 at 08:21, Taryn Riddin <a href="mailto:taryn.riddin@live.co.za"><taryn.riddin@live.co.za></a> wrote:<o:p></o:p></pre>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<pre><o:p> </o:p></pre>
<pre>Good day<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Is anyone able to give me some advice please on choosing a GPS setup to<o:p></o:p></pre>
<pre>map estuarine habitats in the field? Our SA estuaries are often very narrow<o:p></o:p></pre>
<pre>(1 to 2 km wide) and habitats small. We distinguish between supratidal salt<o:p></o:p></pre>
<pre>marsh, intertidal salt marsh, reeds and sedges, among other habitats. Reeds<o:p></o:p></pre>
<pre>and sedges often form a very narrow band along an estuary. Accuracy needs<o:p></o:p></pre>
<pre>to be as close as possible to 1 m2, perhaps even better.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Someone suggested using a windows / android phone running ArcGIS Collector<o:p></o:p></pre>
<pre>as the GPS in them is as good as a Trimble and also cheaper? It could also<o:p></o:p></pre>
<pre>be a separate GPS linked to a tablet, not necessarily a single hand help GPS<o:p></o:p></pre>
<pre>unit with mapping options. We use ArcGIS software for final map productions<o:p></o:p></pre>
<pre>and analysis.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>I am not very clued up on these aspects so any advise would be greatly<o:p></o:p></pre>
<pre>appreciated.<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>Many thanks in advance,<o:p></o:p></pre>
<pre>Taryn<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>________________________________<o:p></o:p></pre>
<pre>Research Associate - Botany Department<o:p></o:p></pre>
<pre>Nelson Mandela Metropolitan University<o:p></o:p></pre>
<pre>P.O. Box 77000<o:p></o:p></pre>
<pre>Port Elizabeth<o:p></o:p></pre>
<pre>6070<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Africa mailing list<o:p></o:p></pre>
<pre><a href="mailto:Africa@lists.osgeo.org">Africa@lists.osgeo.org</a><o:p></o:p></pre>
<pre>You can UNSUBSCRIBE at <a href="http://lists.osgeo.org/mailman/listinfo/africa">http://lists.osgeo.org/mailman/listinfo/africa</a><o:p></o:p></pre>
</blockquote>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre><o:p> </o:p></pre>
<pre>--<o:p></o:p></pre>
<pre>Gerhardus Geldenhuis<o:p></o:p></pre>
<pre><o:p> </o:p></pre>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Africa mailing list<o:p></o:p></pre>
<pre><a href="mailto:Africa@lists.osgeo.org">Africa@lists.osgeo.org</a><o:p></o:p></pre>
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</blockquote>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Africa mailing list<o:p></o:p></pre>
<pre><a href="mailto:Africa@lists.osgeo.org">Africa@lists.osgeo.org</a><o:p></o:p></pre>
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<pre>.<o:p></o:p></pre>
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