.. _DESBiasFrame:

Bias Frame Product
------------------

Metadata
______________________

+------------------------------------------------+----------------------------------------------------------------------------------------------+
| Data product name                              | `DpdExtDesBiasFrame <https://gitlab.euclid-sgs.uk/ST-DM/ST_DataModel/blob/9.0.2/ST_DM_Schema |
|                                                | /auxdir/ST_DM_Schema/dpd/ext/des/euc-test-ext-des-BiasFrame.xsd#L20-26>`__                   |
+------------------------------------------------+----------------------------------------------------------------------------------------------+
| Data product custodian                         | `OU-EXT <https://euclid.roe.ac.uk/projects/sgu/wiki>`_                                       |
+------------------------------------------------+----------------------------------------------------------------------------------------------+
| Name of the Schema file                        | `euc-test-ext-des-BiasFrame.xsd <https://gitlab.euclid-sgs.uk/ST-DM/ST_DataModel/blob/9.0.2/ |
|                                                | ST_DM_Schema/auxdir/ST_DM_Schema/dpd/ext/des/euc-test-ext-des-BiasFrame.xsd>`__              |
+------------------------------------------------+----------------------------------------------------------------------------------------------+
| Processing Element(s) creating/using the data  |                                                                                              |
| product                                        |                                                                                              |
+------------------------------------------------+----------------------------------------------------------------------------------------------+
| Processing function using the data product     | EXT-DES                                                                                      |
+------------------------------------------------+----------------------------------------------------------------------------------------------+

Detailed description of the data product
========================================
.. DetailedDescStart

Also known as **bias exposure** in DES terminology. This is an input product to the 
DES pipeline. It contains 70 extensions (one for each DECam CCD) with the data of a 
single bias exposure.

The main elements inside this product are:

* **Observation**: Contains information about the telescope pointing (Telra, Teldec, 
  HourAngle, ZenithDistance, Epoch), the observation night and date, and the optical 
  air mass.
* **Saturate**: Global saturation threshold valid for amplifiers A and B.
* **DataStorage**: Element that links to a FITS file containing the bias exposure image
  dataset.

.. include:: ../../fit/fit.ext.des.biasExposure.rst

.. DetailedDescEnd