<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body dir="auto"><div dir="auto">Hi Springer.</div><div dir="auto"><br></div><div dir="auto">I assume your raw data files are being converted to gpx on a computer since the raw terrasync files are proprietary binary files. If you are using trimble pathfinder, you can post process differentialy correct the data if you have access to base station logged at the same time you captured your field data. Having a base station 100 miles away will not improve your results as the baseline is too long.</div><div dir="auto"><br></div><div dir="auto">I do not know if you can write a gpx file directly from pathfinder but I would not bother. I would write a shapefile which will contain the coordinate system you specify. Simply open in qgis and you should be good to go. If your older unit works better, I would expect it may be an issue with the setup within pathfinder or perhaps the software version.</div><div dir="auto"><br></div><div dir="auto">I think your consistent offset is a direct result of how you are converting your data from trimble to gpx.</div><div dir="auto"><br></div><div dir="auto">As I mentioned in my previous comments, there are many issues which affect accuracy. Just because the box says it is accurate you will rarely replicate that in the field. </div><div dir="auto"><br></div><div dir="auto">In terms of WAAS dataframes, these are processed internally on your field unit.</div><div dir="auto"><br></div><div dir="auto">Kirk Schmidt </div><div dir="auto"><br></div><div dir="auto"><br></div><div dir="auto"><br></div><div id="composer_signature" dir="auto"><div style="font-size:85%;color:#575757" dir="auto">Sent from my Galaxy</div></div><div dir="auto"><br></div><div><br></div><div align="left" dir="auto" style="font-size:100%;color:#000000"><div>-------- Original message --------</div><div>From: Springfield Harrison <stellargps@gmail.com> </div><div>Date: 2021-03-07 5:57 a.m. (GMT-04:00) </div><div>To: kirk <kirk@nortekresources.com>, Jorge Gustavo Rocha <jgr@geomaster.pt>, qgis-user@lists.osgeo.org, Greg Troxel <gdt@lexort.com>, Dan <19dmb83@gmail.com>, Nicolas Cadieux <njacadieux.gitlab@gmail.com> </div><div>Subject: Re: [Qgis-user] Trimble GeoXT 2005 Accuracy </div><div><br></div></div>
<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 cols="72" class="moz-signature">-----
Cheers, Spring</pre>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 06/Mar/2021 15:56, kirk wrote:<br>
</div>
<blockquote type="cite">
<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>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto"><br>
</div>
<div dir="auto" id="composer_signature">
<div dir="auto" style="font-size:85%;color:#575757">Sent from my
Galaxy</div>
</div>
<div dir="auto"><br>
</div>
<div><br>
</div>
<div align="left" style="font-size:100%;color:#000000" dir="auto">
<div>-------- Original message --------</div>
<div>From: Jorge Gustavo Rocha <a href="mailto:jgr@geomaster.pt" class="moz-txt-link-rfc2396E"><jgr@geomaster.pt></a> </div>
<div>Date: 2021-03-06 6:41 p.m. (GMT-04:00) </div>
<div>To: <a href="mailto:qgis-user@lists.osgeo.org" class="moz-txt-link-abbreviated">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 class="moz-txt-link-freetext" href="https://www.ardusimple.com/product/rtk-handheld-surveyor-kit/">https://www.ardusimple.com/product/rtk-handheld-surveyor-kit/</a></p>
<p>[2] <a class="moz-txt-link-freetext" href="https://play.google.com/store/apps/details?id=np.com.softwel.swmaps">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 wrap="" class="moz-quote-pre">Springfield Harrison <a class="moz-txt-link-rfc2396E" href="mailto:stellargps@gmail.com"><stellargps@gmail.com></a> writes:
</pre>
<blockquote type="cite">
<pre wrap="" class="moz-quote-pre">Thanks Dan. See my relies to Kirk and Greg. The Emlid sounds
interesting, will have a look.
</pre>
</blockquote>
<pre wrap="" class="moz-quote-pre">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 class="moz-txt-link-freetext" href="https://www.ardusimple.com/product/simplertk2b/">https://www.ardusimple.com/product/simplertk2b/</a>
</pre>
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