List of CDS's on-the-fly HATS products.

HATS stands for "Hierarchical Adaptive Tiling Scheme".
It is a "format" developped by the LINCC, see their github repo.
The current structure of CDS on-the-fly HATS products is based on the LSDB Gaia example.
This prototype will continue evolving to match the evolving LINCC-HATS format.

All CDS HATS products are generated on-the-fly from HEALPix indexed data.
Although so far the list of available product is limited, all VizieR large catalogues can be added very quickly (matter of adding names in a list).

	Name
	2MASS/
	AllWISE/
	EUCLID_MER1/
	GPS1/
	GSC_1.1/
	HSOY/
	SDSS16/
	SDSS7/
	TIC/
	des_dr1/
	des_dr2/
	gaia_dr2/
	gaia_dr3/
	gaia_dr3_astroparams/
	gaia_dr3_astroparamssupp/
	gaia_dr3_epochphot/
	gaia_dr3_rvsmean/
	gaia_edr3/
	gaia_edr3_dist/
	skymapper_dr11/

WARNING: This is a proof-of-concept in an pre-alpha version: do not use for serious buisness!
WARNING: Do not use as a way to harvest larges catalogues without the consent of the CDS (and possibly of original providers)!

• 02/09/2025
• Set row group size = 10_000 rows for smaller download time overhead and smaller memory footprint on server side (both due to row ordering to col ordering conversion)
• Remove xx_.with_border11.parquet files: collection with margins to be done!
• Rename the properties file hats.properties (and deprecated properties)
• Rename the point_map.fits file skymap.fits (and deprecate point_map.fits)
• Remove hats_coordinate_epoch from properties file
• Add hats_npix_suffix = .parquet in the properties file
• Add hats_skymap_alt_orders = 6 7 9 10 11 in the properties file
• Add hats_frame = equatorial in the properties file
• Add hats_version = v0.1 in the properties file
• Add hats_estsize in the properties file
• 22/11/2024
• Replace old keywords by newer ones in the properties file
• 21/11/2024
• Change _healpix_29 type from unsigned long to signed long
• 22/10/2024
• Add _healpix_29 column
• Remove JSON serialized VOTable metadata from parquet files
• Add the dataset dirrectory
• 30/09/2024
• Fix LASTPIX in skymaps.
• 23/09/2024
• CatHAGrid (Catalogue in an Healpix Adaptative Grid) to HATS (Hierarchical Adaptive Tiling Scheme) renaming
• Add skymap.ORDER.png files
• Deprecate catalog_info.json and add properties
• 10/09/2024
• Add point_map.fits and skymap.ORDER.fits files
• Remove colums Dir and #rows in parition_info.csv (Dir was wrong with %n instead of /n)
• 04/09/2024
• Add VOTable metadata in Parquet schema (in addition to the Arrow schema)
• 14/08/2024
• Put n in the URL instead of in the query parameters