Data Volume
SDSS Science Archive Server (SAS)
The SAS is a hierarchical directory structure with named data products, and can be navigated directly:
- hierarchically by directory,
- by named data product,
- including the datamodel documentation.
Individual data products are either replacements from previous data releases, and add incrementally to the data volume, or contain links to previous data releases, and add cumulatively to the data volume. Whether you are interested in the incremental volume or the cumulative volume depends on whether you want to maintain the archive's directory structure including the links, or if you prefer to expand the data volume by traversing the links. Although it is recommended to do so, copying the incremental volume may risk broken links unless you also copy the data from the previous releases, whereas traversing links to copy the full cumulative volume may risk obtaining duplicate files.
SDSS Access is the recommended python package to transfer each species of file within a data product, and copies the increments for each specified release keeping links intact without duplication.
Incremental Data Volume for Data Release 17
- 335,971 directories
- 50,264,992 files
- 245 TB
Previous releases, including DR8 -- DR16, have a combined incremental volume of:
- 5,238,520 directories
- 340,027,062 files
- 407 TB
APOGEE Data
| SAS Directory | Datamodel | Dir Count | File Count | File Size |
|---|---|---|---|---|
| apogee/spectro/aspcap | APOGEE_ASPCAP | 37,311 | 7,146,994 | 21 TB |
| apogee/vac/apogee-astronn | APOGEE_ASTRONN | 1 | 1 | 647 MB |
| apogee/spectro/data | APOGEE_DATA | 784 | 116,021 | 17 TB |
| apogee/spectro/data1m | APOGEE_DATA_1M | 787 | 4,897 | 329 GB |
| apogee/spectro/data2s | APOGEE_DATA_2S | 858 | 67,430 | 8284 GB |
| apogee/vac/apogee-fire_sim | APOGEE_FIRE_SIM | 17 | 2,802 | 18 TB |
| apogee/vac/apogee-gc | APOGEE_GC | 1 | 2 | 2566 kB |
| apogee/vac/apogee-nc | APOGEE_NC | 1 | 1 | 367 MB |
| apogee/vac/apogee-net | APOGEE_NET | 1 | 1 | 56 MB |
| apogee/vac/apogee-occam | APOGEE_OCCAM | 1 | 2 | 4066 kB |
| apogee/vac/apogee-rc | APOGEE_RC | 2 | 1 | 266 MB |
| apogee/spectro/redux | APOGEE_REDUX | 59,445 | 15,458,629 | 52 TB |
| apogee/vac/apogee-sb2 | APOGEE_SB2 | 1 | 1 | 8593 kB |
| apogee/spectro/speclib | APOGEE_SPECLIB | 1,404 | 1,923,663 | 59 TB |
| apogee/vac/apogee-starhorse | APOGEE_STARHORSE | 1 | 1 | 289 MB |
| apogee/target | APOGEE_TARGET | 2 | 598 | 5316 MB |
| apogee/vac/apogee-thejoker | APOGEE_THEJOKER | 1,897 | 358,351 | 31 GB |
| Total | 102,522 | 25,079,401 | 175 TB | |
MaNGA Data
| SAS Directory | Datamodel | Dir Count | File Count | File Size |
|---|---|---|---|---|
| manga/agn | MANGA_AGN | 2 | 2 | 40 kB |
| manga/spectro/firefly | MANGA_FIREFLY | 2 | 5 | 13 GB |
| manga/gema | MANGA_GEMA | 2 | 2 | 7223 kB |
| manga/HI | MANGA_HI | 9 | 13,262 | 414 MB |
| manga/mandala | MANGA_MANDALA | 3 | 128 | 37 MB |
| manga/morphology | MANGA_MORPHOLOGY | 9 | 39,951 | 9798 MB |
| manga/spectro/mangapca | MANGA_PCA | 620 | 10,883 | 22 GB |
| manga/photo | MANGA_PHOTO | 3 | 2 | 14 MB |
| manga/spectro/pipe3d | MANGA_PIPE3D | 11,477 | 2,387,203 | 440 GB |
| manga/spectro/analysis | MANGA_SPECTRO_ANALYSIS | 178,045 | 991,262 | 9696 GB |
| manga/spectro/data | MANGA_SPECTRO_DATA | 1 | 0 | 0 bytes |
| manga/spectro/lensing | MANGA_SPECTRO_LENSING | 635 | 3,056 | 702 GB |
| manga/spectro/mastar | MANGA_SPECTRO_MASTAR | 8 | 18 | 26 GB |
| manga/spectro/redux | MANGA_SPECTRO_REDUX | 19,145 | 1,885,965 | 34 TB |
| manga/spectro/specz | MANGA_SPECZ | 989 | 48,682 | 283 GB |
| manga/target | MANGA_TARGET | 2 | 2 | 31 MB |
| Total | 210,955 | 5,380,423 | 46 TB | |
eBOSS / SDSS Data
| SAS Directory | Datamodel | Dir Count | File Count | File Size |
|---|---|---|---|---|
| eboss/photoObj | BOSS_PHOTOOBJ | 10 | 311 | 58 MB |
| eboss/spectro/data | BOSS_SPECTRO_DATA | 1 | 0 | 0 bytes |
| eboss/spectro/redux | BOSS_SPECTRO_REDUX | 19,373 | 16,451,004 | 20 TB |
| eboss/lss | EBOSS_LSS | 39 | 36,035 | 1065 GB |
| eboss/spectro/lensing | EBOSS_SPECTRO_LENSING | 3 | 2 | 29 kB |
| sdss/spectro/redux | SPECTRO_REDUX | 2 | 11 | 49 GB |
| Total | 19,447 | 16,487,365 | 21 TB | |
APO Data
| SAS Directory | Datamodel | Dir Count | File Count | File Size |
|---|---|---|---|---|
| apo/spectro | APO_SPECTRO_DATA | 481 | 134,220 | 1653 GB |
| apo/ecam | ECAM_DATA | 24 | 15,192 | 11 GB |
| apo/gcam | GCAM_DATA | 605 | 1,026,395 | 438 GB |
| apo/ircam | IRCAM_DATA | 606 | 793,367 | 98 GB |
| apo/mapper | MAPPER_DATA | 519 | 13,362 | 89 GB |
| Total | 2,236 | 1,982,536 | 2290 GB | |
LCO Data
| SAS Directory | Datamodel | Dir Count | File Count | File Size |
|---|---|---|---|---|
| lco/bcam | BCAM_DATA_2S | 266 | 27,776 | 51 GB |
| lco/gcam | GCAM_DATxA_2S | 282 | 1,302,977 | 205 GB |
| lco/mapper | MAPPER_DATA_2S | 281 | 4,203 | 220 MB |
| Total | 831 | 1,334,956 | 255 GB | |
