[PROJ] OGC/OSGeo/ASF code sprint: GIGS and GGXF proposals

[Even Rouault]

Hi Martin,

thanks for letting us know.

A few points:

- I'm not sure the PROJ project has a plan to adopt GGXF as being a 
format it would read out-of-the-box, mostly because we're quite happy 
with the Geodetic TIFF Grids (GTG) that we have been using in production 
for more than 2 years now, including in a CDN context. And also because 
reading netCDF-4 file would mean to add a new heavy dependency to PROJ. 
If GGXF eventually comes into common usage, we'll probably use a 
converter script to create GTG files from it, unless it comes with real 
unique features, used in practice, that we can't reasonably port to GTG. 
So if someone is interested by that activity in the context of this code 
sprint, developing such script, probably using netcdf4-python to read 
GGXF and GDAL Python bindings to write GeoTIFF, would probably the most 
useful outcome.

- regarding GIGS, PROJ has a subset of (I'm not sure which version of) 
them as scripts executable by its gie utility in 
https://github.com/OSGeo/PROJ/tree/master/test/gigs

Even

Le 21/02/2022 à 15:22, Martin Desruisseaux a écrit :
>
> Hello all
>
> The joint OGC/OSGeo/ASF code sprint will start in 2 weeks, with a 
> pre-event webinar in 2 days (Wednesday this week). This event is free 
> for anyone to participate, and thanks to Ordnance Survey sponsor a 
> little bit of funding will be available for participants who apply and 
> who are selected as eligible (more details to be provided by OGC 
> later). The schedule is below:
>
>     https://github.com/opengeospatial/developer-events/wiki/2022-Joint-OGC-%E2%80%93-OSGeo-%E2%80%93-ASF-Code-Sprint
>
> Any development activity related to OGC standards can be proposed. 
> Below are 2 proposals that may be relevant to PROJ:
>
>
>       Proposal: GGXF implementation
>
> The Gridded Geodetic data eXchange Format (GGXF) is an OGC 
> standardization effort for distributing datum shift grids, geoid 
> models, and more geodetic gridded data. It has the same goal than the 
> GeoTIFF files that PROJ currently uses for this purpose. Chris Crook, 
> who worked on the PROJ GeoTIFF format, is also a very active 
> participant to the GGXF effort, together with Roger Lott, the main 
> editor of ISO 19111 (referencing by coordinates) and ISO 19162 (WKT 2) 
> standards. Some other participants in the working group are from ESRI 
> or from International Association of Geodesy (IAG). The GGXF standard 
> uses the netCDF-4 format. A draft of the GGXF standard and a prototype 
> in Python are available. The code sprint would be an opportunity for 
> volunteers for starting an implementation in PROJ, with Chris, Roger 
> and other peoples present for answering questions and collecting 
> feedback. For more details, see:
>
>     https://github.com/opengeospatial/developer-events/tree/master/2022/Joint-OGC-OSGeo-ASF-Code-Sprint%202022/ideas/GGXF
>
>
>       Proposal: GIGS implementation
>
> The Geospatial Integrity of Geoscience Software (GIGS) is an IOGP 
> effort for providing tests for coordinate operations. IOGP is the 
> organization maintaining the widely-used EPSG geodetic database. GIGS 
> tests are available as dataset (CSV files), web service and executable 
> JUnit tests. The JUnit tests can be executed on any GeoAPI 3.0 
> implementation, including PROJ through the PROJ-JNI binding. The Java 
> language is used for GIGS tests because it is currently the only 
> language providing implementation-neutral API for referencing services 
> (Python could be another candidate but the GeoAPI interfaces in Python 
> are still in development). The code sprint would be an opportunity for 
> volunteers to help upgrading to GIGS 2 and complete the tests (in 
> Java), tests them on PROJ, and continue development of Python interfaces.
>
>     https://github.com/opengeospatial/developer-events/tree/master/2022/Joint-OGC-OSGeo-ASF-Code-Sprint%202022/ideas/GIGS
>
>
>       Mentoring
>
> In addition to volunteers for above proposals, the PROJ project can 
> also propose tutorials for beginners. On the mentor stream, developers 
> will have the opportunity to give their first steps using the 
> standards and projects, and hopefully this will build an engagement 
> which will continue past the code sprint. More information are there:
>
>     https://dev.to/doublebyte/2nd-open-software-and-open-standards-code-sprint-call-for-mentors-1g0o
>
>
> Home page and registration: https://developer.ogc.org/sprints/15/
>
>     Martin
>
>
>
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