[PROJ] [EXTERNAL] [gdal-dev] Static/Dynamic datum problems

[Cameron Shorter]

Thanks Doug, you have pointed me to Matt Higgins who is one of the 
Australians on this email's CC list. He has contributed toward 
identifying this problem. I believe we need to bring this conversation 
into an international forum, probably headed up by the OGC.

You might be able to suggest who we should connect with?

Warm regards, Cameron

On 24/6/19 11:30 pm, Newcomb, Doug wrote:
> 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 
> <cameron.shorter at gmail.com <mailto:cameron.shorter at gmail.com>> 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 doug_newcomb at fws.gov <mailto:doug_newcomb at fws.gov>
> ---------------------------------------------------------------------------------------------------------
>
> */NOTE: This email correspondence and any attachments to and from this 
> sender is subject to the Freedom of Information Act (FOIA) and may be 
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-- 
Cameron Shorter
Technology Demystifier
Open Technologies and Geospatial Consultant

M +61 (0) 419 142 254

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