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<p>Hello All,<br>
<br>
Thanks for the comments, I'll reply more fully tomorrow.<br>
<br>
The receiver is Trimble mapping grade:<br>
<br>
"The GeoExplorer 2005 series consists of:<br>
• The GeoXH™ handheld, providing subfoot (30 cm) accuracy, or even
8-inch (20 cm) accuracy<br>
with the optional Zephyr™ antenna.<br>
• The GeoXT™ handheld offering submeter accuracy for GIS data
collection and data<br>
maintenance.<br>
• The GeoXM™ handheld with 1–3 meter GPS accuracy for mobile GIS
applications."<br>
<br>
"Post processed carrier accuracy: 1-30cm". This receiver was
probably $5-8000 (?) new.<br>
</p>
<ul>
<li>Data collection was stationary, open sky, good satellite
coverage, several minutes of 5 sec observations, good PDOP</li>
<li>SBAS and/or post processed<br>
</li>
</ul>
<p>The concern is not the accuracy as such, but the systematic NW
shift. This has been observed over several months, consistently.
My old Trimble ProXR (1994?, $20K new!) is actually better in this
regard than the GeoXT!<br>
<br>
The Trimble manuals make no mention of the SBAS CRS, implying
"turn it on and go, the receiver will integrate the SBAS into the
rover file." <br>
<br>
More tomorrow, thanks . . . . .<br>
</p>
<pre class="moz-signature" cols="72">-----
Cheers, Spring</pre>
<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix"><br>
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<div class="moz-cite-prefix">On 06/Mar/2021 15:56, kirk wrote:<br>
</div>
<blockquote type="cite"
cite="mid:1615075006663.40e9530464c6df51@nortekresources.com">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div dir="auto">A few notes.</div>
<div dir="auto"><br>
</div>
<div dir="auto">sbas which is waas in north America is based on
equatorial satellites which will get you in the 1 m range in
southern Canada. </div>
<div dir="auto"><br>
</div>
<div dir="auto">you can achieve sub decimeter accuracy
consistently using rtk ,either through a ntrip caster (base
station) broadcasting over the intenet or with your own base
station and a radio link. there are a few chip sets and break
out boards that you acquire and assemble your own system. This
is a very inexpensive option.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Another option in Canada is to use precise point
positioning (PPP) which requires 6 to 12 hours of observation
data using L1, L2 or L1 and L2 data and rinex log files. This
comes in handy if you need to establish a remote base station.</div>
<div dir="auto"><br>
</div>
<div dir="auto">A proper antennae with a metal ground plane is
also critical to getting quality results.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Observing under a forested canopy is difficult
especially in summer under leaf on conditions, after a rain
which creates multiparth mayhem.</div>
<div dir="auto"><br>
</div>
<div dir="auto">There is a reason survey grade equipment is
relatively expensive. If you require repeatably accurate results
in a variety of conditions this is an option.</div>
<div dir="auto"><br>
</div>
<div dir="auto">Kirk Schmidt </div>
<div dir="auto"><br>
</div>
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</div>
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<div style="font-size:85%;color:#575757" dir="auto">Sent from my
Galaxy</div>
</div>
<div dir="auto"><br>
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<div dir="auto" style="font-size:100%;color:#000000" align="left">
<div>-------- Original message --------</div>
<div>From: Jorge Gustavo Rocha <a class="moz-txt-link-rfc2396E" href="mailto:jgr@geomaster.pt"><jgr@geomaster.pt></a> </div>
<div>Date: 2021-03-06 6:41 p.m. (GMT-04:00) </div>
<div>To: <a class="moz-txt-link-abbreviated" href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a> </div>
<div>Subject: Re: [Qgis-user] Trimble GeoXT 2005 Accuracy </div>
<div><br>
</div>
</div>
<p>Hi,</p>
<p>I just jump in this thread to say I'm really impressed with
Ardusimple. I have a RTK Handheld Surveyor Kit [1] for +- 400 €
and it works really well.</p>
<p>I use the national NTRIP service and I have consistently
precisions around 10 cm with just one receiver. <br>
</p>
<p>I use a free Android application called SW Maps [2]. My survey
points, tracks and photos are collect in a geopackage that I can
read in QGIS. I use it mostly to collect ground control points
for my drone flights.<br>
</p>
<p>Regards,</p>
<p>Jorge Gustavo<br>
</p>
<p>[1] <a
href="https://www.ardusimple.com/product/rtk-handheld-surveyor-kit/"
class="moz-txt-link-freetext" moz-do-not-send="true">https://www.ardusimple.com/product/rtk-handheld-surveyor-kit/</a></p>
<p>[2] <a
href="https://play.google.com/store/apps/details?id=np.com.softwel.swmaps"
class="moz-txt-link-freetext" moz-do-not-send="true">https://play.google.com/store/apps/details?id=np.com.softwel.swmaps</a></p>
<div class="moz-cite-prefix">Às 20:12 de 06/03/21, Greg Troxel
escreveu:<br>
</div>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Springfield Harrison <a href="mailto:stellargps@gmail.com" class="moz-txt-link-rfc2396E" moz-do-not-send="true"><stellargps@gmail.com></a> writes:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Thanks Dan. See my relies to Kirk and Greg. The Emlid sounds
interesting, will have a look.
</pre>
</blockquote>
<pre class="moz-quote-pre" wrap="">I have an earlier Emlid Reach (not RS or RS2), which has L1 only, and I
never got it to work well.
Also look at the Ardusimple unit -- but it's more a parts kit than a
system. You need a way to get RTK reference data in, and a good
antenna. One approach is Vespucci (OSM editor for Android) as a
datalogger, and the Ardusimple WiFi NTRIP master to get corrections over
the phone's hotspot.
<a href="https://www.ardusimple.com/product/simplertk2b/" class="moz-txt-link-freetext" moz-do-not-send="true">https://www.ardusimple.com/product/simplertk2b/</a>
</pre>
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<title>Email Signature</title>
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<td rowspan="6" style="text-align:center; font-size: 10pt;
font-family: Arial, sans-serif; border-right: 1px solid;
border-right-color: #fb6303; width: 125px;
padding-right: 10px; vertical-align: top;" width="125"
valign="top"> <a href="https://www.geomaster.pt"
moz-do-not-send="true"><img
src="https://geomaster.pt/wp-content/uploads/2017/02/cropped-geomaster300x300-1.png"
style="width:105px; height:auto; border:0;"
alt="Logo"
onmouseover="imageMousePointerUpdate(true)"
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moz-do-not-send="true" width="85" border="0"></a> </td>
<td style="padding-left:10px">
<table cellspacing="0" cellpadding="0">
<tbody>
<tr>
<td style="font-size: 10pt; color:#0079ac;
font-family: Arial, sans-serif; width: 400px;
padding-bottom: 5px; padding-left: 10px;
vertical-align: top;" valign="top"> <strong><span
style="font-size: 14pt; font-family: Arial,
sans-serif; color:#fb6303;">Geomaster</span></strong><br>
<strong><span style="font-size: 11pt;
font-family: Arial, sans-serif;
color:black;">Jorge Gustavo Rocha</span></strong>
<span style="font-family: Arial, sans-serif;
font-size:11pt; color:#000000;"><span
style="padding-right: 5px; padding-left:
5px;"> | </span>Software Engineer</span> </td>
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5px; padding-top: 5px; padding-left: 10px;
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valign="top"> <span><span style="color:
#fb6303;"><strong>e:</strong></span><span
style="font-size: 10pt; font-family: Arial,
sans-serif; color:#000000;"> <a
href="mailto:jgr@geomaster.pt"
class="moz-txt-link-abbreviated"
moz-do-not-send="true">jgr@geomaster.pt</a></span></span>
<span><span style="padding-left:
5px;padding-right: 5px;"> | </span><span
style="color: #fb6303;"><strong>m:</strong></span><span
style="font-size: 10pt; font-family: Arial,
sans-serif; color:#000000;"> +351 910 333
888<br>
</span></span> <span><span style="color:
#fb6303;"><strong>g:</strong></span><span
style="font-size: 10pt; font-family: Arial,
sans-serif; color:#000000;">
41.54094,-8.40490</span></span> <span><span
style="padding-left: 7px;padding-right:
5px;"> | </span><span style="color:
#fb6303;"><strong>v: </strong></span><span
style="font-size: 10pt; font-family: Arial,
sans-serif; color:#000000; padding-left:
7px;"> 510 906 109<br>
</span></span> <span> <span style="color:
#fb6303;"><strong>a: </strong></span> </span>
<span> <span style="font-size: 10pt;
font-family: Arial, sans-serif; color:
#000000;"><span> </span>Rua António Cândido
Pinto, 67, 4715-400 Braga<br>
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