The composition of planetary surfaces is mainly studied through optical and near-IR observations from imaging spectrometers on space missions. This data are notoriously difficult to interpret because diagnostic features are subdued and hidden in highly correlated dataset.
A complete VO workflow to interpret such observations is being assessed, relying on:
- An absorption extraction algorithm based on multiscale wavelet analysis (Erard et al 2011, https://doi.org/10.1016/j.pss.2011.07.004)
- the same type of extraction performed on laboratory spectra of controlled samples in public databases
- documented bandlists collected from publications or recent measurements (eg, in SSHADE - Schmitt et al 2022, https://doi.org/10.5194/epsc2022-778)

The workflow is used to analyze the observations and to compare retrieved absorption characteristics with those from bandlists or samples. This activity relies on existing VO standards and tools — an extension of EPN-TAP (https://ivoa.net/documents/EPNTAP/) to access planetary science data in the VO may be designed to support this.
The evaluation of the quality of match between observations and references will be discussed on the basis of simple test cases.

Europlanet 2024 RI has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 871149

In the framework of the Europlanet H2024 European grant [1] some work has been done to define planetary standards for FITS World Coordinate System [2].
Different research communities are involved in planetary coordinate standardization.
Geologists and Remote Sensing specialists work on extending Earth standards to Planets using Geographical Information Systems (GIS) and coordinate descriptions endorsed by the Open Geospatial Consortium (OGC).
Astronomers work to define FITS World Coordinate System [3] for planetary bodies.
To improve interoperability between those two worlds we implemented the planetary WCS description in Astropy.
This poster describes the related new features available in Astropy 6.0:
- the possibility to define a Geodetic Coordinate Representation on a custom spheroid using its equatorial radius and flattening;
- the definition of a new Bodycentric coordinate representation for custom spheroids;
- the possibility to read and write planetary WCS keywords to define a body-fixed planetary reference frame.
Some examples of applications, also available as jupyter notebooks tutorials, will be discussed.
The work has been funded by the EuroplanetH2024 Research Infrastructure (RI) European project [1] which has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 871149.

[1] http://www.europlanet-2024-ri.eu/
[2] https://doi.org/10.1029/2018EA000388
[3] https://fits.gsfc.nasa.gov/fits_wcs.html