[PROJ] NOAA VDatum Tidal Grids and PROJ CDN

[Martin Desruisseaux]

Le 16/12/2020 à 15:52, Greg Troxel a écrit :

> It's not clear to me where on the path from concept to full 
> implemention the ISO registry is. At a quick glance it seems to 
> contain only a small fraction of what is in the EPSG database.
>
My current understanding is that software such as PROJ, Apache SIS, etc. 
would not be direct consumers of ISO registry. Instead, ISO registry 
would feed EPSG (or other) registry, which in turn feed PROJ (or other) 
software. My guess is that the rational for this indirection level is as 
below:

EPSG collects data from various national agencies, but this not always 
done by or under the supervision of agency staff. Errors may happen, and 
the EPG database has many deprecated entries (7% of all entries last 
time I checked – not all because of errors) replaced by new entries when 
errors were found. By contrast, all entries in the ISO registry are 
either provided directly by national agency staffs, or reviewed by them 
before publication. From EPSG perspective, I think that the ISO registry 
fills a hole: it provides a central authoritative source where EPSG can 
refer instead than hunting themselves for data all around the world.

Last time I checked, I found a web interface and API for querying 
specific CRS, but nothing for downloading the whole database (contrarily 
to EPSG). It contributes to my impression that software interested in 
the whole database are not the primary target of ISO registry.

     Martin


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/proj/attachments/20201217/e18050d3/attachment.html>