[PROJ] OGC blog post summarising Web-mapping misalignment problem

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Hello, 

in the name of simplicity I would suggest storing and referencing data
to "what the most simple GPS (GNSS) receiver gives" if possible ... and
without any additional datum or ellipsoid or time (outside GMT(UTC) or
geoid transformations. Since GPS receivers usually give accurate time
and (temporary) coordinate information BUT often cannot even calculate
the geoid correctly (so better to use the reference ellipsoid instead).
So anything too complicated from the GPS receiver is out of the question
... and would also slow down the process needlessly when recording lot
of points. 

And since that would be the preferred way to store data ... and what
also could stay reasonably accurate at least year or two everywhere on
the planet (forgetting the time) which usually suits most needs. And
then the rest of the complexity built on that and starting from there. 

If one needs to know wehere the point really was since it is now maybe
50 years since it was measured he would then do some more (but minimal)
complicated calculations. 

A good real life example of that would be: 

- the beginning of some Australian runway was recorded "here"
(coordinates and time using some simple GPS receiver) 50 years ago
[additionally maybe its length, direction and slope] 

- where it is now (coordinates directly usable with some simple GPS
receiver .. so to be able to ask "where should I go now to find the same
spot") 

- most simple and fastest calculation possible 

Janne. 

------------------------------------------------ 

Cameron Shorter kirjoitti 2019-08-22 00:50:

> Proj folks, 
> A bit of an update. A few of us have been refining our thinking and description of the web-mapping misalignment problem. Scott from the OGC has noted the importance of this topic and invited us to raise the topics at the next OGC Technical Committee meeting at Banff (9 Sept). (Getting approval to travel to the event is becoming trickier than we'd expected.) 
> 
> The OGC has published a blog post from us summarising the issues: 
> https://www.opengeospatial.org/blog/3045 
> 
> And we are working on a more detailed discussion paper which we plan to socialise within a week or two. 
> 
> Cheers,  -- 
> 
> Cameron Shorter 
> Technology Demystifier 
> Open Technologies and Geospatial Consultant 
> 
> M +61 (0) 419 142 254 
> 
> _______________________________________________
> PROJ mailing list
> PROJ at lists.osgeo.org
> https://lists.osgeo.org/mailman/listinfo/proj

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