[PROJ] Static/Dynamic Webmapping Problem version 2.0
cameron.shorter at gmail.com
Sun Jul 14 16:59:55 PDT 2019
I'm a little nervous that I've overwhelmed people by the number of pages
I've used to describe the web-mapping misaligned maps problem.
The key message I'm hoping to get feedback on is:
* We are currently using the dynamic WGS84 datum as if it were a static
datum (locked to a different epoch in different regions).
* This appears to be suitable for current web mapping requirements.
* Realigning static and dynamic datums (as started by Australia, with
others to follow) is tripping a map misalignment problem.
* Define an EPSG code which describes current practice of a static datum,
which is fixed to different epochs in different regions.
* Move to using the new EPSG code in web-mapping.
Question to techies:
* Is it technically possible to create a reference frame realisation
(datum) which is fixed to different epochs in different regions?
Warm regards, Cameron
On Fri, 12 Jul 2019 at 22:32, Cameron Shorter <cameron.shorter at gmail.com>
> Hi folks,
> I've incorporated a lot of feeback from people on this list, and from the
> Australian geospatial people and have restarted the Static/Dynamic
> Webmapping Problem.
> Comments are encouraged.
> If commenting, please log so we know who says what. Please don't change
> the text as it quickly becomes difficult to read.
> I'm very mindful that this is a challenging problem, requiring
> collaboration to solve, and we still have quite a bit of work in achieving
> Doc here:
> Original problem statement:
> >* > 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.*
> Cheers, Cameron
> Cameron Shorter
> Technology Demystifier
> Open Technologies and Geospatial Consultant
> M +61 (0) 419 142 254
Open Technologies and Geospatial Consultant
M +61 (0) 419 142 254
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