<div dir="ltr">Hi Taryn,<div> 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.</div><div><br></div><div><a href="http://www.resource-analysis.com/Services/GPS">http://www.resource-analysis.com/Services/GPS</a><br></div><div><br></div><div>Regards,</div><div><br></div><div>Losso Ekolo</div><div><br></div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Wed, May 20, 2015 at 1:54 PM, Wilhelm Herbst <span dir="ltr"><<a href="mailto:wherbst@optron.com" target="_blank">wherbst@optron.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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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.<u></u><u></u></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"> <a href="mailto:africa-bounces@lists.osgeo.org" target="_blank">africa-bounces@lists.osgeo.org</a>
[mailto:<a href="mailto:africa-bounces@lists.osgeo.org" target="_blank">africa-bounces@lists.osgeo.org</a>] <b>On Behalf Of </b>Dean Ollis<br>
<b>Sent:</b> Wednesday, 20 May, 2015 1:52 PM<br>
<b>To:</b> <a href="mailto:africa@lists.osgeo.org" target="_blank">africa@lists.osgeo.org</a></span></p><div><div class="h5"><br>
<b>Subject:</b> Re: [OSGeo Africa] Field mapping GPS suggestions please<u></u><u></u></div></div><p></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>
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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>
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Kind regards<br>
<br>
Dean<br>
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<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>
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------- 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>
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<pre>Mobile phone GPS may give you an accuracy of 25m if you are lucky.<u></u><u></u></pre>
<pre>Maybe just draw your special areas in by hand on a 1:1000 field map<u></u><u></u></pre>
<pre>with a pencil crayon.<u></u><u></u></pre>
<pre>For mobile GIS/GPS try HGIS from Starpal, it will only run on a<u></u><u></u></pre>
<pre>Windows mobile OS but the demo works for free in Africa for<u></u><u></u></pre>
<pre>Environmental projects. Otherwise if you find an android device with a<u></u><u></u></pre>
<pre>decent clock you can run QGIS Android version.<u></u><u></u></pre>
<pre>Chris Berens<u></u><u></u></pre>
<pre>PLATO GISc 1308<u></u><u></u></pre>
<pre><a href="http://www.mapland.co.za" target="_blank">www.mapland.co.za</a><u></u><u></u></pre>
<pre><a href="tel:%2B27%20%280%2982%20567%209322" value="+27825679322" target="_blank">+27 (0)82 567 9322</a><u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre><u></u> <u></u></pre>
<pre>On 20 May 2015 at 10:27, Gerhardus Geldenhuis<u></u><u></u></pre>
<pre><a href="mailto:gerhardus.geldenhuis@gmail.com" target="_blank"><gerhardus.geldenhuis@gmail.com></a> wrote:<u></u><u></u></pre>
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<pre>Hi,<u></u><u></u></pre>
<pre>I am no expert but I can't imagine that a mobile phone will be equivalent in<u></u><u></u></pre>
<pre>accuracy to something like a Trimble. You most certainly pay for the brand<u></u><u></u></pre>
<pre>but you also pay of the more accurate internal clock that plays a crucial<u></u><u></u></pre>
<pre>part in the error margin. I have used a Garmin 60CSx with a lot of success<u></u><u></u></pre>
<pre>doing Geological mapping. If you add an external antenna that could also<u></u><u></u></pre>
<pre>help with accuracy.<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre>Regards<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre>On 20 May 2015 at 08:21, Taryn Riddin <a href="mailto:taryn.riddin@live.co.za" target="_blank"><taryn.riddin@live.co.za></a> wrote:<u></u><u></u></pre>
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<pre><u></u> <u></u></pre>
<pre>Good day<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre>Is anyone able to give me some advice please on choosing a GPS setup to<u></u><u></u></pre>
<pre>map estuarine habitats in the field? Our SA estuaries are often very narrow<u></u><u></u></pre>
<pre>(1 to 2 km wide) and habitats small. We distinguish between supratidal salt<u></u><u></u></pre>
<pre>marsh, intertidal salt marsh, reeds and sedges, among other habitats. Reeds<u></u><u></u></pre>
<pre>and sedges often form a very narrow band along an estuary. Accuracy needs<u></u><u></u></pre>
<pre>to be as close as possible to 1 m2, perhaps even better.<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre>Someone suggested using a windows / android phone running ArcGIS Collector<u></u><u></u></pre>
<pre>as the GPS in them is as good as a Trimble and also cheaper? It could also<u></u><u></u></pre>
<pre>be a separate GPS linked to a tablet, not necessarily a single hand help GPS<u></u><u></u></pre>
<pre>unit with mapping options. We use ArcGIS software for final map productions<u></u><u></u></pre>
<pre>and analysis.<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre>I am not very clued up on these aspects so any advise would be greatly<u></u><u></u></pre>
<pre>appreciated.<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre>Many thanks in advance,<u></u><u></u></pre>
<pre>Taryn<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre><u></u> <u></u></pre>
<pre>________________________________<u></u><u></u></pre>
<pre>Research Associate - Botany Department<u></u><u></u></pre>
<pre>Nelson Mandela Metropolitan University<u></u><u></u></pre>
<pre>P.O. Box 77000<u></u><u></u></pre>
<pre>Port Elizabeth<u></u><u></u></pre>
<pre>6070<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
<pre>_______________________________________________<u></u><u></u></pre>
<pre>Africa mailing list<u></u><u></u></pre>
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<pre><u></u> <u></u></pre>
<pre><u></u> <u></u></pre>
<pre><u></u> <u></u></pre>
<pre><u></u> <u></u></pre>
<pre>--<u></u><u></u></pre>
<pre>Gerhardus Geldenhuis<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
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<pre>.<u></u><u></u></pre>
<pre><u></u> <u></u></pre>
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