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ATLAS Survey
This is the ATLAS portal for the KiDS Survey Prodcution team. We want to use the ATLAS data to improve the KiDS survey photometric homogeneity (using overlaps) and (2) support KiDS science cases which are also applicable to ATLAS (for now just the KiDS Strong-Lensing project).
Status (last update 14 Apr 2015)
We are producing u,g,r,i (not z!) ATLAS coadds re-using/adapting the KiDS pipeline.
South-West secondary star issue
- The issue I noted earlier with the small secondary star ~2” to the
southwest of brighter stars only appears in one g-band image. It is odd
that the secondary star is not the same brightness as the standard and I
can't really think what might cause this.
ATLAS tiles mapping onto Astro-WISE classes
First the ATLAS observing strategy:
- each of the ugriz filters in each tile is observed with 2 dithers
- see link to ATLAS homepage below for more details.
Now the mapping of it on Astro-WISE classes
- Observations after 2011-10-31: each tile is observed in ugriz. Observations for each of the 5 filters maps onto a single ObservingBlock.
- Observations before 2011-10-31: more a mess. We are considering to clean it by creating manually same mapping as >2011-10-31
Validation set: tile overlapping with SDSS
ATLAS data (1 pointing position) overlapping with SDSS (SEGUE):
The DATE_OBS for the RawScienceFrames is:
2013-06-02 00:45:26
2013-06-02 00:43:42
2013-02-11 07:10:16
2013-02-11 07:11:53
2012-05-20 02:03:29
2012-05-20 02:04:54
2013-02-03 07:02:43
2013-02-03 07:04:18
First production set: Cluster: APMCC917
- Cluster information: APMCC 917
- Wget export script:
The DATE_OBS for the RawScienceFrames is:
2011-09-29 05:58:21
2011-09-29 05:56:49
2011-09-25 01:06:04
2011-09-25 01:04:31
2011-09-29 04:57:25
2011-09-29 04:55:54
2011-09-24 05:45:24
2011-09-24 05:46:54
2011-09-29 05:59:54
2011-09-29 06:01:24
2011-09-25 01:07:35
2011-09-25 01:09:10
2011-09-29 04:58:55
2011-09-29 05:00:29
2011-09-29 06:04:26
2011-09-29 06:02:56
2011-09-25 01:12:12
2011-09-25 01:10:41
2011-11-29 02:39:18
2011-11-29 02:40:43
2011-12-05 01:45:05
2011-12-05 01:46:30
2011-08-22 07:39:28
2011-08-22 07:38:01
2011-11-28 01:40:30
2011-11-28 01:41:56
2011-11-29 02:42:31
2011-11-29 02:43:55
2011-12-05 01:50:15
2011-12-05 01:51:40
2011-08-22 07:40:54
2011-08-22 07:42:21
2011-11-29 02:45:41
2011-11-29 02:47:06
2011-12-05 01:54:03
2011-12-05 01:55:28
2011-11-19 01:47:03
2011-11-19 01:48:31
2011-09-25 05:46:51
2011-09-25 05:45:25
2011-12-13 01:41:51
2011-12-13 01:43:18
2011-09-27 06:20:29
2011-09-27 06:21:54
2011-11-19 01:50:18
2011-11-19 01:51:47
2011-09-25 05:48:19
2011-09-25 05:49:44
2011-12-13 01:45:26
2011-12-13 01:46:57
2011-11-19 01:53:37
2011-11-19 01:55:03
2011-09-25 05:52:38
2011-09-25 05:51:13
2012-10-14 01:30:26
2012-10-14 01:28:44
2012-09-13 03:10:12
2012-09-13 03:08:29
2012-06-24 08:25:34
2012-06-24 08:23:54
2012-10-16 00:59:05
2012-10-16 00:57:21
2012-10-14 01:34:23
2012-10-14 01:32:39
2012-09-13 03:14:14
2012-09-13 03:12:32
2012-06-24 08:29:40
2012-06-24 08:27:56
2012-10-16 01:03:02
2012-10-14 01:38:16
2012-10-14 01:36:37
2012-09-13 03:18:07
2012-09-13 03:16:27
Coadd QC
Report 2015-04-16: QC of 207 ATLAS coadds in SAMI cluster regions
| QC check | Nr OK | Nr NOK |
|---|---|---|
| Cross-talk | 207 | 0 |
| Bg subtr. | 206 | 1 |
| Calibrations | 207 | 0 |
| Astrom | 162 | 45 |
| Photom | 207 | 0 |
| PSF difference | 196 | 11 |
| Overal verdict | 156 | 51 |
Astrometry statistics
Data points: blue = u; green = g; red = r; magenta = i
Dashed lines: QC limits adopted in qcCoadd_ATLAS.py
PSF sizes and size variations
Data points: blue = u; green = g; red = r; magenta = i
Data in hand
VST-ATLAS pipeline description
We have a first draft pipeline. The VST-ATLAS pipeline is derived from the KiDS production pipeline.
A quick summary of the salient steps:
| step | description | |
|---|---|---|
| QC upon ingest | not done, we simply take the most recent exposures of a field to be the right ones (not using ESO's QC (grade A,B,C) | |
| Readnoise | nightly OmegaCAM calibrations | |
| Gainlinearity | regularly (~ 3 per month) OmegaCAM calibrations | |
| Flat-fielding and illumination correction | re-using the calibrations made for KiDS | |
| Fringe correction]] | using same fringe maps as KiDS (not doing z) | |
| Cross-talk | done, using our general OmegaCAM configuration | |
| Background subtraction | row-by-row subtraction like KiDS | |
| Hot pixels | nightly OmegaCAM hotpixels (todo: check all are public) | |
| Cold pixels | regular (~2-3 per week) OmegaCAM calibrations | |
| Satellite maps | we do not know yet what is used (either single-frame based or 2-frame based | |
| Photometric calibration | done, nightly ZPTS as much as possible, except for u: forever | |
| Chip-to-chip photometric corrections | use fixed set (link to values will come) | |
| Exposure-to-exposure photometric homogenization | applied | |
| Coadd-to-coadd photometric homogenization | no applied | |
| Astrometric calibration | done, global | |
| Automatic Coadd masks | not done | |
| Sourcelists | not done | |
| Manual Coadd Masks | not done |
References / handy links.
Scratch notes
- Check calibration pool settings are applicable for GTO projects
- Check GTO calibration pools are not compromised
