[Proj] Coming releases of PROJ.4

[Thomas Knudsen]

Dave,

You need time tagging of observations in order to transform from a global
reference frame (WGS84, ITRF) to a plate fixed (NAD83, ETRS89).

For a next generation of dynamic datums, this will be even more of an
issue, although in ways that are not totally clear as yet.

Cheers,
Thomas

2017-06-26 15:17 GMT+02:00 caress <caress at mbari.org>:

> Thomas,
>
> Thanks. Looking again at the discussion thread it should have been clear
> to me that the functions used by MB-System are not changing.
>
> With respect to time dependence, we certainly are doing repeated seafloor
> surveys that resolve both lateral and vertical deformation. For instance,
> on Axial seamount our repeated 1-m-scale bathymetry surveys show ~10-m wide
> fissures that opened coincident with the 2011 and 2015 eruptions, and
> annual repeat surveys are measuring the several tens of cm of uplift each
> year associated with the inflation of the subsurface magma reservoir.
> However, I’m not sure how having time dependence in Proj can tie into our
> representing or modeling this deformation. Any advice would be welcome.
>
> Cheers,
> Dave
>
>
>
>
> > On Jun 24, 2017, at 8:57 AM, Thomas Knudsen <knudsen.thomas at gmail.com>
> wrote:
> >
> > Dave,
> >
> > We are NOT changing the API of a core dependency of yours. We are adding
> a new, more coherent one, in anticipation of a growing need of fully
> dynamic datum transformations.
> >
> > The new API in proj.h is orthogonal to the classic API in proj_api.h
> >
> > I do, however, expect that you will need the functionality exposed in
> the new API - if not now, then in a few years time.
> >
> > /Thomas
> >
> > 2017-06-24 10:46 GMT+02:00 caress <caress at mbari.org>:
> >
> > As the architect of a package, I have similar feelings about anyone that
> changes the API of a core dependency.
> >
> > _______________________________________________
> > Proj mailing list
> > Proj at lists.maptools.org
> > http://lists.maptools.org/mailman/listinfo/proj
>
> ----------------------------------------------------
> David W. Caress
> Software Engineer
>
> Monterey Bay Aquarium Research Institute
> 7700 Sandholdt Road
> Moss Landing, CA 95039
>
> caress at mbari.org
> http://www.mbari.org/~caress/
>
> Phone: 831-775-1775
>
>
> _______________________________________________
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