Image Quality Catalog¶
Exposure Selection¶
Exposures are selected using the SISPI list_images tool. This has to run on any of the mountain top computers such as system1.
list_images '[(id>=159000),(flavor=object),(exptime>=30.0),(delivered=True),(guider>0),(guider<3)]'
This example selects all object type images with an exposure time of at least 20 seconds since exposure 159000. This image was taken on December 8, 2012 after the guider software was repaired. The delivered and guider criteria guarantee that the image was complete, that the guider was on and that the guider didn't loose all guide stars during the exposure.
IQ Catalog (Science Verification - Dec 2012 until Feb 2013)¶
For the final SV catalog we have decided to use only exposures taken in February after many issues related to image quality had been fixed. This includes issues with the guider software, guider jumps, tracking issues etc.The catlog includes all exposures of type object with an exposure time of at least 20 seconds (note that we used to require at least 30 seconds for previous catalogs). DES data as well as images taken on the Cosmos field (propid 2013A-0351) are used. The information in the catalog is stitched together from different sources:
- Exposure Database
- Guider log files
- Donut Analysis (Ann)
- First Cut PSF studies (Jiangang)
- First Cut output (Eric S.)
- Image Health (Ken)
- TCS (Kevin)
SV IQ Catalog Variables¶
Click here for a brief description of the variables included in the SV IQ catalogs
Catalog Files¶
The catalog is a comma separate ascii file. Lines starting with # are comments
| iq_feb_sv_tcs.dat | IQ Catalog including TCS information for SV IQ studies (all February exposures) |
| iq_feb_sv.dat | IQ Catalog for SV IQ studies (all February exposures) |
| iq_20130131.dat | IQ Catalog for all exposures from 159000 until January 31, 2013 |
IQ Catalog (Community Program - Mar 2013 until ...)¶
During the time DES is not observing we continue to monitor image quality using the information archived in the mountain top databases. FirstCut information is not available for these exposures. This results in a slightly different format for the IQ catalogs.The following information is included:
- Exposure Database
- Guider log files
- Image Health
- TCS
- Donut Analysis
SV IQ Catalog Variables¶
Click here for a brief description of the variables included in the CP IQ catalogs
Catalog Files¶
The catalog is a comma separate ascii file. Lines starting with # are comments
| iq-cp-0301-0419.dat | IQ Catalog (all suitable community program exposures from March 1 to April 19) |
The IQ catalogs for the Community Program period are also available as SQLite database files
| iq-cp-0301-0419.db | IQ Catalog (all suitable community program exposures from March 1 to April 19) |
Utilities¶
The IQ catalogs are simple csv files that can be processed with a number of tools. For your convenience,
catalog.py is a simple python module that
provides a few functions to work with IQ catalog files. Most useful is probably getdata that reads in the catalog file and converts it to a python dictionary using the column names as keys.