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<div id="smartTemplate4-template">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>
-----------------------------------------------------------
<span>
<br>
<span style="font-family: Arial; font-size: 10pt;">Dean Justin
Ollis <i>Pr.Sci.Nat.</i>
<br>
<b>The Freshwater Consulting Group</b>
<br>
</span></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>
<font face="Arial"> </font></div>
<br>
<blockquote
cite="mid:CAM__GR3LhgTqoyoGGp3Av1caB_9kFAH-yngQQXk7Hq+-ckt2=w@mail.gmail.com"
type="cite">
<pre wrap="">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
<a class="moz-txt-link-abbreviated" href="http://www.mapland.co.za">www.mapland.co.za</a>
+27 (0)82 567 9322
On 20 May 2015 at 10:27, Gerhardus Geldenhuis
<a class="moz-txt-link-rfc2396E" href="mailto:gerhardus.geldenhuis@gmail.com"><gerhardus.geldenhuis@gmail.com></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">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 <a class="moz-txt-link-rfc2396E" href="mailto:taryn.riddin@live.co.za"><taryn.riddin@live.co.za></a> wrote:
</pre>
<blockquote type="cite">
<pre wrap="">
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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<pre wrap="">
--
Gerhardus Geldenhuis
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