| 22 | 22 | The standard implementation of DVO uses a stores the database information as a collection FITS tables. For a subset of the tables (Average, SecFilt, Measure, Missing), the data is partitioned into multiple files representing different regions on the sky. The partitioning scheme allows for a wide range of scale on which the sky is divided. At one extreme, the entire sky is represented by a single file. At the next level, this is split into Declination bands of width 7.5 degrees. Next, these bands are split into RA ranges. The next levels subdivide the RA / DEC ranges into smaller and smaller patches. From the third level on down, the size of the sky regions varies with Galactic latitude to better sample regions of high and low stellar density. |
