Cameron, I just emailed someone working on this . He sent me the links below.
https://www.gps.gov/governance/advisory/ https://www.gps.gov/governance/advisory/members/higgins/ Doug On Thu, Jun 20, 2019 at 5:15 PM Cameron Shorter <[email protected]> wrote: > Hi folks, > > 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. > > 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: > 1. Transforming from GDA94 to GDA2020 reflects Australia’s tectonic > movement of ~ 1.8 metres to the North East. > 2. GDA94 was defined as ‘equal to WGS84’ in 1994. > 3. GDA2020 was defined as ‘equal to WGS84’ in 2020. > All three statements can’t be accurate. It results in mis-aligned maps in > WGS84 > > 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. > 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. > -- > Cameron Shorter > Technology Demystifier > Open Technologies and Geospatial Consultant > > M +61 (0) 419 142 254 > > > > -- Doug Newcomb - Cartographer USFWS 551F Pylon Dr Raleigh, NC 919-856-4520 ext. 14 [email protected] --------------------------------------------------------------------------------------------------------- *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.*
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