Catalog http://tds.aviso.altimetry.fr/thredds/ocean-data-challenges/ocean-data-challenges.html

Dataset	Size	Last Modified
`Ocean data challenges`		`--`
`2020a-SSH-mapping-NATL60-along-track-data/`		`--`
`2020a-SSH-mapping-NATL60-grid-data/`		`--`
`2021a-SSH-mapping-OSE-along-track-data/`		`--`
`2021a-SSH-mapping-OSE-grid-data/`		`--`