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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