[gdal-dev] Simple features/sql-mm and bezier/elliptical curves

[Darafei "Komяpa" Praliaskouski]

https://www.iso.org/standard/60343.html

ISO/IEC 13249-3:2016
Information technology — Database languages — SQL multimedia and
application packages — Part 3: Spatial

PDF costs 198 CHF (215 USD), and I don't know how DRM'd it is. The checkout
form has weird things like "number of copies" for PDF. If we can
meaningfully use it without getting lawsuits I'd say we should get it.

Inside it has chapters on TIN (my interest) ST_EllipticalCurve and
ST_NURBScurve (Nyall's original question), there's also something
ST_SpiralCurve in the list, looking at the table of contents on the preview
website.

On Tue, Oct 12, 2021 at 7:08 PM Paul Ramsey <pramsey at cleverelephant.ca>
wrote:

> This would be something we could put our (PostGIS) OSGeo budget to,
> perhaps, in lieu of any other activities going on this year.
>
> P
>
> > On Oct 12, 2021, at 3:00 AM, Darafei Komяpa Praliaskouski <me at komzpa.net>
> wrote:
> >
> > Hello,
> >
> > ISO SQL/MM has chapters for NURBS and other magical geometry types. The
> text is unfortunately not free - I'd love us to have a copy for the PostGIS
> team at least. Last time I was touching that topic was around 2019 when I
> wanted to make TINs somewhat more compatible.
> >
> > OGC has a very limited subset, and sometimes may contradict ISO.
> >
> >
> > аў, 12 кас 2021, 01:13 карыстальнік Nyall Dawson <nyall.dawson at gmail.com>
> напісаў:
> > Hi list,
> >
> > Slightly off-topic question (but I figure the people who would know
> > would be subscribed to this list):
> >
> > Is anyone aware if there's been **any** talk/movement toward formally
> > introducing bezier and/or elliptical curve support into the SF/SQL/MM
> > specifications? Has anyone come across any informal approaches for
> > describing elliptical curves/bezier in WKT?
> >
> > Thanks in advance,
> > Nyall
> > _______________________________________________
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>
>
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