| Data Product | Description | Size1 |
|---|---|---|
| Point Source Catalog | ~400 million sources Catalog meets Level 1 Specs Measured fluxes or upper limits at J, H, and Ks Single band-merged position Source quality, etc. flags | ~120 GB |
| Extended Source Catalog | ~1 million sources Catalog meets Level 1 Specs Measured fluxes or upper limits at J, H, and Ks using several measures Single band-merged position Source quality, etc. flags | 0.5 GB |
| Extended Source Catalog Image Atlas | ~1 million background-removed Atlas Images per band corresponding to every source in Ext. Src. Cat. Usual Image Sizes 101" x 101" | ~120 GB |
| Digital Image Atlas | 1.3 million images per band Each Image is 500x1024 1" pixels Made from Individual Scans (not on regular grid through sky) Resolution ~4" (22 Atlas Images / Scan x 60,000 scans) | 8,300 GB |
| Point Source Reject File | ~400? million sources File does not meet Level 1 Specs Measured fluxes or upper limits at J, H, and Ks Single band-merged position Source quality, etc. flags | ~120? GB |
| Extended Source Reject File | ~10? million sources File does not meet Level 1 Specs Measured fluxes or upper limits at J, H, and Ks using several measures Single band-merged position Source quality, etc. flags | 50? GB |
| Extended Source Reject File Image Atlas | ~3 million background-removed Atlas Images per band corresponding to subset of sources in Ext. Src. Rej. File Usual Image Sizes 101" x 101" | ~360 GB |
Examples of compressed 2MASS images (> 100 KB)
Point Source Catalog ~120 GB (400 million sources x 300 bytes) Extended Source Catalog 0.5 GB (1 million sources x 500 bytes) Extended Source Image Atlas ~120 GB (1 million sources x 101 x 101 x 4 bytes x 3 bands) Digital Image Atlas of the Sky 8.3 TB (60,000 scans x 22 images/scan x 512 x 1024 x 4 bytes x 3 bands) Point Source Reject File (name tbd - may just be the source file) 120? GB (400? million sources x 300 bytes) Extended Source Reject File (name tbd - may just be the source file) 50? GB (10 million sources x 500 bytes) Extended Source Image Atlas for Reject File 360 GB (~3 million sources x 101 x 101 x 4 bytes x 3 bands) R. Cutri has written up a Data Volume Profile, giving the rate at which these products build up with time. It also contains the tape management plan for staging the data.