<div dir="ltr">Cameron,<div> I just emailed someone working on this . He sent me the links below. </div><div><br></div><div><div class="gmail-gE gmail-iv gmail-gt" style="padding:20px 0px 0px;font-size:0.875rem;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif"><table cellpadding="0" class="gmail-cf gmail-gJ" style="border-collapse:collapse;margin-top:0px;width:auto;font-size:0.875rem;letter-spacing:0.2px;display:block"><tbody style="display:block"></tbody></table></div><div id="gmail-:45x" style="font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:medium"><div class="gmail-qQVYZb"></div><div class="gmail-utdU2e"></div><div class="gmail-btm"></div></div><div class="gmail-" style="font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:medium"><div class="gmail-aHl" style=""></div><div id="gmail-:41x" tabindex="-1"></div><div id="gmail-:41m" class="gmail-ii gmail-gt gmail-adO" style="font-size:0.875rem;direction:ltr;margin:8px 0px 0px;padding:0px"><div id="gmail-:41l" class="gmail-a3s gmail-aXjCH" style="overflow:hidden;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:small;line-height:1.5;font-family:Arial,Helvetica,sans-serif"><a href="https://www.gps.gov/governance/advisory/" rel="noreferrer" target="_blank">https://www.gps.gov/governance/advisory/</a><br><br><a href="https://www.gps.gov/governance/advisory/members/higgins/" rel="noreferrer" target="_blank">https://www.gps.gov/governance/advisory/members/higgins/</a></div><div id="gmail-:41l" class="gmail-a3s gmail-aXjCH" style="overflow:hidden;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:small;line-height:1.5;font-family:Arial,Helvetica,sans-serif"><br></div><div id="gmail-:41l" class="gmail-a3s gmail-aXjCH" style="overflow:hidden;font-variant-numeric:normal;font-variant-east-asian:normal;font-stretch:normal;font-size:small;line-height:1.5;font-family:Arial,Helvetica,sans-serif">Doug</div></div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Jun 20, 2019 at 5:15 PM Cameron Shorter <<a href="mailto:cameron.shorter@gmail.com">cameron.shorter@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Hi folks,<br><br>Our Australian spatial data users are about to face a systematic mismatch challenge when trying to use multiple static datums (GDA2020, GDA94) with the dynamic datum (WGS84). At the moment, it is government agencies grappling with the problem, but it is about to become a mainstream issue.<br><br>Australia now has static datums for the years 1994 and 2020 and uses WGS84 (a time-dependent datum!), for web-mapping and web-services. We recognise:<br>1. Transforming from GDA94 to GDA2020 reflects Australia’s tectonic movement of ~ 1.8 metres to the North East.<br>2. GDA94 was defined as ‘equal to WGS84’ in 1994.<br>3. GDA2020 was defined as ‘equal to WGS84’ in 2020.<br>All three statements can’t be accurate. It results in mis-aligned maps in WGS84<br><br>I believe this is a problem the whole world needs to address, given the upcoming modernsation of significant national datums including the U.S and we need to bring this topic into an international conversation, ASAP.<br>I'm interested to know if anyone here is looking into and/or has opinions on how it should be solved. I'd like to incorporate your ideas into the recommendations that we are putting foward.<br><div>-- <br></div><div dir="ltr" class="gmail-m_-6873679771758165188gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><div><span style="font-size:12.8px">Cameron Shorter</span><br></div><div>Technology Demystifier</div><div>Open Technologies and Geospatial Consultant</div><div><br></div><div>M +61 (0) 419 142 254</div><div><br></div></div><div><br><br></div></div></div></div></div></div></div></div></div></div></div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div><div>Doug Newcomb - Cartographer</div><div>USFWS</div><div>551F Pylon Dr</div><div>Raleigh, NC</div><div>919-856-4520 ext. 14 <a href="mailto:doug_newcomb@fws.gov" target="_blank">doug_newcomb@fws.gov</a></div><div>---------------------------------------------------------------------------------------------------------</div><div><br></div></div><div><b style="font-size:12.8px"><i><font color="#0000ff">NOTE: This email correspondence and any attachments to and from this sender is subject to the Freedom of Information Act (FOIA) and may be disclosed to third parties.</font></i></b><span style="color:rgb(0,0,255);font-family:"courier new",monospace;font-size:12.8px"></span><br></div></div></div></div></div></div></div></div>