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

Cameron Shorter cameron.shorter at gmail.com
Tue Jun 25 11:38:08 PDT 2019

Hi proj folks, I'm sharing insights from Scott Simmons from the OGC, 
with his permission ...

On 25/6/19 5:02 pm, Scott Simmons wrote:
> Hi Cameron,
> I am glad that you are taking up this charge as well - this is a HUGE 
> issue.
> <snip>
> A few data points to consider.
> 1. The OGC Abstract Specification Topic #2 Referencing by Coordinates 
> (also ISO 19111:2019): 
> http://docs.opengeospatial.org/as/18-005r4/18-005r4.html was 
> specifically updated to address 4D coordinate reference systems (CRSs) 
> earlier this year. This standard forms the foundation for how CRSs are 
> used in other OGC and ISO standards.
> 2. Other OGC standards will automatically benefit from dynamic CRSs if 
> they leverage Referencing by Coordinates. We also have a handful of 
> temporal standards (like TimeseriesML). But many geometry standards 
> won’t get much out of these changes if the data don’t include temporal 
> information - huge issue!
> 3. We are in the midst of updating the Features and Geometries 
> standard such that it will also subsume Simple Features. Now is a good 
> time to ensure that time is adequately handled in this work.
> 4. We have both a CRS Domain and Standards Working Group (CRS DWG and 
> CRS SWG). The CRS DWG would be a good forum to develop the 
> requirements to push to other SWGs handling geometry standards. I’d be 
> happy to help setup such a discussion at our next TC Meeting.
> 5. And speaking of the next TC Meeting (starting 9 September 2019 in 
> Banff, Canada), we will have a keynote presentation and systems update 
> from the US GPS team.
> Best Regards,
> Scott

Cameron Shorter
Technology Demystifier
Open Technologies and Geospatial Consultant

M +61 (0) 419 142 254

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