If you want to work with data that was released in SDSS-IV or earlier, then check the Completed Surveys page for direct links to data descriptions, caveats, and relevant tutorials. Completed surveys include:
- Imaging legacy survey (SDSS-I/II)
- Supernova Survey (SDSS-II)
- SEGUE (SDSS-II) and SEGUE-2 (SDSS-III)
- MARVELS (SDSS-III)
- BOSS (SDSS-III) and eBOSS (SDSS-IV)
- APOGEE (SDSS-III) and APOGEE-2 (SDSS-IV)
- MaNGA (SDSS-IV)
- MaStar (SDSS-IV
We have tutorials available on parameter files, fits files, and using bitmasks, and a page with conversions between our wavelength and magnitude systems and other systems. You can find an overview page of SDSS-IV tutorials on the SDSS-IV tutorials page.