[Proj] Coming releases of PROJ.4

Richard Greenwood richard.greenwood at gmail.com
Wed Jun 28 20:03:04 EST 2017

I'm really excited to see these proposals and totally unqualified to
comment on the technical aspects. I'll only half seriously throw out my
thought on naming/numbering. Rather than "Proj.4 10.0" I think something
like "cs2cs version 2.0" would be better. Projections are just that and
that's all Proj.4 did under Gerald Evenden. Correctly if I'm wrong, but I
don't think Proj.4 had any sense of datums until Frank Wamerdam took on
maintenance of the project. Aside from Charles Karney's work on etmerc I
haven't seen much happening with projections, but datums are increasingly
important and will become even more so over at least the next decade.

Like I said, this is only a half serious suggestion, but maybe a more
creative mind than mine could come up with a name more accurately conveys
what Proj.4 currently is without completely divorcing itself from its
Proj.4's heritage.

When I started what is now called "proj4js" I named is "CSCS" as a play on
cs2cs as well as Client Side Coordinate Systems (client being browser
javascript) and that didn't get anywhere so the name recognition of "Proj"
name be more important than trying to convey its larger role.


On Tue, Jun 27, 2017 at 7:36 AM, Thomas Knudsen <knudsen.thomas at gmail.com>

> 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
>> _______________________________________________
>> Proj mailing list
>> Proj at lists.maptools.org
>> http://lists.maptools.org/mailman/listinfo/proj
> _______________________________________________
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj

Richard W. Greenwood, PLS
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.maptools.org/pipermail/proj/attachments/20170628/9fdfe623/attachment.htm 

More information about the Proj mailing list