<div dir="ltr"><div>Our receivers work fine in Australia as I live in Canberra and work for the Swift Navigation engineering department. Using one of the free CORS stations here I can get 2cm positions from my car. Mind you the setup cost ~$2000.</div><div><br></div>Australia has only moved 1.8m since 1994. <a href="http://theconversation.com/australia-on-the-move-how-gps-keeps-up-with-a-continent-in-constant-motion-71883">http://theconversation.com/australia-on-the-move-how-gps-keeps-up-with-a-continent-in-constant-motion-71883</a><div><br></div><div>Unfortunately OpenStreetMaps only uses "WGS84" as it's datum which is not that well defined compared to a surveying datum like GDA94/2020 or ITRF, and most existing data has only been measured to a few metres (at most). So I wouldn't worry too much about the drift as there are other larger sources of error in OpenStreetMaps.</div><div><br></div><div>The SBAS trial is available to anyone with a receiver that can be set to use PRN 122 (e.g. Ublox devices).</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><br style="font-size:12.8px"><span style="font-size:12.8px">Thanks,</span><br style="font-size:12.8px"><span style="font-size:12.8px">Leith Bade</span><br><div><span style="font-size:12.8px"><a href="mailto:leith@bade.nz" target="_blank">leith@bade.nz</a></span></div></div></div></div>
<br><div class="gmail_quote">On 12 June 2018 at 12:56, Andrew Harvey <span dir="ltr"><<a href="mailto:andrew.harvey4@gmail.com" target="_blank">andrew.harvey4@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div>If you use RTK <a href="https://en.wikipedia.org/wiki/Real-time_kinematic" target="_blank">https://en.wikipedia.org/<wbr>wiki/Real-time_kinematic</a> you should get centimeter accuracy, but expect to pay $10k+.</div><div><br></div><div><a href="https://www.swiftnav.com" target="_blank">https://www.swiftnav.com</a> seems like a cheaper option but not sure if it works in Australia and it not a consumer device, seems they just sell the boards.<br></div><div> </div>...once you obtain sub-meter accuracy, keep in mind the whole continent is moving so even if you had no error in your GPS, a node someone entered in OSM in 2007 from GPS would be almost a meter out from someone entering it into OSM today.<div><br></div><div>The SBAS trial was only aviable to selected people as part of the trial, does anyone know if it'll will work on regular devices, or will we need to run additional software, for Android, iOS?</div></div><div class="gmail_extra"><br><div class="gmail_quote"><div><div class="h5">On 12 June 2018 at 12:39, Alex Sims <span dir="ltr"><<a href="mailto:alex@softgrow.com" target="_blank">alex@softgrow.com</a>></span> wrote:<br></div></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div class="h5">
<div lang="EN-AU" link="#0563C1" vlink="#954F72">
<div class="m_1563932628334312553m_-7228111469410195308WordSection1">
<p class="MsoNormal"><span style="font-size:11.0pt">Hi,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I’m really wanting to have better accuracy from GPS for use with Openstreetmap. I can use survey marks and a laser rangefinder, but having a portable GPS would make so much easier to fix errors where objects
have been armchair mapped or even GPS mapped with errors up to 3 meters.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">I have tried three approaches<u></u><u></u></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="m_1563932628334312553m_-7228111469410195308MsoListParagraph" style="margin-left:0cm"><span style="font-size:11.0pt">QZSS – I can see this on my Android mobile phone but it doesn’t seem to be used. It seems as though I need a Japanese market device and even then I’m
not sure I’ll get an increase<u></u><u></u></span></li><li class="m_1563932628334312553m_-7228111469410195308MsoListParagraph" style="margin-left:0cm"><span style="font-size:11.0pt">Galileo – looks promising but when I’ve tested on supported devices (friends who have recent phones) the accuracy isn’t delivered. Further investigation
shows that there aren’t enough satellites in service yet most of the day to give 4 visible. (Using GNSS View
<a href="http://qzss.go.jp/en/" target="_blank">http://qzss.go.jp/en/</a> English text)<u></u><u></u></span></li><li class="m_1563932628334312553m_-7228111469410195308MsoListParagraph" style="margin-left:0cm"><span style="font-size:11.0pt">Lastly the SBAS trial from Geoscience Australia -
<a href="http://www.ga.gov.au/scientific-topics/positioning-navigation/positioning-for-the-future/satellite-based-augmentation-system" target="_blank">
http://www.ga.gov.au/scientifi<wbr>c-topics/positioning-navigatio<wbr>n/positioning-for-the-future/<wbr>satellite-based-augmentation-<wbr>system</a> - nothing magical has happened with any of the consumer grade devices I have access to. Also not sure how to test on an Android
device if it is being used.<u></u><u></u></span></li></ul>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Has anyone obtained sub-meter accuracy from any of these approaches, it must be possible?<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Please discuss.<span class="m_1563932628334312553HOEnZb"><font color="#888888"><u></u><u></u></font></span></span></p><span class="m_1563932628334312553HOEnZb"><font color="#888888">
<p class="MsoNormal"><span style="font-size:11.0pt"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Alex<u></u><u></u></span></p>
</font></span></div>
</div>
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