My two cents: About NGS / NOAA, I know that the new CRS they are preparing for 2022 it clearly time dependent. I attended an online conference (oriented to surveyors) last year about it, and they insisted a lot on the time variable and plates drift. There are some of them in the PROJ mailing list (maybe here as well) -there was a discussion about including some grid files in PROJ-data-. Maybe involving them in this topic may produce more traction.
Cheers, Javier .___ ._ ..._ .. . ._. .___ .. __ . _. . __.. ... .... ._ .__ Entre dos pensamientos racionales hay infinitos pensamientos irracionales. On Thu, 13 May 2021 at 19:54, Greg Troxel <g...@lexort.com> wrote: adopt RFC 81: support for coordinate epochs in geospatial formats ( https://github.com/OSGeo/gdal/pull/3827 ) > Howard Butler <how...@hobu.co> writes: > > > It extends existing formats in GDAL's own way > > --------------------------------------------------------------- > > > > Are there many other cases where GDAL augments and extends behavior of > > formats by bolting on metadata bits? I can think of some GeoTIFF tags > > where GDAL has done this in the past. Some of them have been adopted > > industry-wide, but most have not. We definitely haven't done that to a > > long list of formats like this RFC proposes to do. > > (I don't count formally.) > > I think I agree with Even's position here. And, I see this as not being > "GDAL's own way", but "a proposed way for the open geospatial community". > > But, overall this makes me wonder: Are there any formats for expressing > epoch in the open source/open format world, and also in the proprietary > world?. I'm not aware of any (which means epsilon more than zero) and a > quick search did not turn up anything. > > Obviously the US NGS keeps track of such things in their bluebook and > NGS Integrated Datbase formats as they transform positions among epochs > when doing adjustments, but that's a rather specialized and not so > relevant to GIS format. > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev >
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