Spectra, coadds, and redshifts organized per tile are under
tiles/GROUPTYPE/TILEID/GROUPID
. These come in various groups (GROUPTYPE),
e.g. whether they are data from a single exposure, a single night,
all data for a given tile across all nights, or a custom combination.
Related: all data for a given patch of sky, including data grouped across overlapping tiles and coadds of targets observed on multiple tiles, are organized under the :doc:`healpix <../healpix/index>` directories.
GROUPTYPE
can be one of:
cumulative
- Coadds of all spectra on a given tile across all nights.
pernight
- Coadds of all spectra on a given tile in a given night.
perexp
- Spectra grouped by tile and then exposure.
1x_depth
- Selected custom subsets of exposures of deep (N>>1 exposures) tiles to achieve a combined depth for each subset matching the main survey depth. That is, they are subsets of the total exposures taken for that tile, selected to achieve a specific depth, for systematics comparisons with the full depth coadds+redshifts in the cumulative group that has all exposures for each tile.
4x_depth
- Similar to
1x_depth
, but selected to achieve a combined depth of 4x the main survey depth. lowspeed
- Coadds of deep tiles using only exposures taken under poor observing conditions, for systematics checks vs. coadds using data taken under normal/good conditions. "lowspeed" refers to the rate at which S/N is accumulated.
Other custom GROUPTYPE
may appear in future produtions, and not every
production will include every GROUPTYPE
.
The GROUPID
depends on the GROUPTYPE
:
GROUPTYPE | GROUPID |
---|---|
cumulative | YEARMMDD NIGHT - all data through that night |
pernight | YEARMMDD NIGHT - only data from that night |
perexp | EXPID - only data from that single exposure |
1x_depth | subset number |
4x_depth | subset number |
lowspeed | subset number |
e.g. spectra, coadds, and
redshifts for all exposures of tile 80605 observed on 20210109 are
under tiles/pernight/80605/20210109
, while all data for tile 80605
for all nights through 20210205 (including previous nights like 20210109)
are under tiles/cumulative/80605/20210205
.
Subdirectories of tiles/
:
.. toctree:: :maxdepth: 1 GROUPTYPE/index