[PROJ] transofmrations test suite

[Martin Desruisseaux]

Hello Filip

The International Association of Oil & Gas Producers (IOGP), the group 
which create and maintain the EPSG database, created the Geospatial 
Integrity of Geoscience Software (GIGS) test suite. By coincidence they 
just released version 2 this week: https://gigs.iogp.org/

The GIGS version 2 tests are published as a set CSV files (this is a 
change compared to version 1, which was published as Microsoft Excel 
files). Those tests are partially implemented in a separated project 
which use GeoAPI [1] interfaces for executing those tests. GeoAPI is in 
Java, but can be executed with PROJ using PROJ-JNI [2]. Actually a 
branch of PROJ-JNI already execute part of the GIGS tests. I believe 
that there is also some C/C++ code for executing some GIGS tests in PROJ 
code base. The tests using GeoAPI has the advantage of being executable 
on different implementations, which allow comparisons. The Java code for 
the tests is at [3], but there is discussion for transferring this test 
suite to IOGP if they are interested.

Note sure if it help, but just for information,

     Martin

[1]http://www.geoapi.org/
[2]https://github.com/OSGeo/PROJ-JNI
[3]https://github.com/desruisseaux/GIGS


Le 26/11/2021 à 16:35, wcd a écrit :

> Hello,
> I would like to develop a test suite around my coordinate 
> transformation provider which uses PROJ. The test suite should provide 
> a reference so when I update say the proj version or some parameters 
> in the future, I can still be sure I get the same results as before.
>
> I am looking for some test data for this purpose. Perhaps I could 
> generate some lat lon grids within area of interest of each coordinate 
> system and project these grids to obtain the reference data. And I 
> could do something similar to obtain reference data for different 
> datum transformations too.
>
> I wonder if somebody has done this kind of thing before. Do you have a 
> better idea? Are there any standard datasets that proj or other 
> libraries are tested against?
>
> Many thanks for any input.
> Filip.
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