.. index:: PRNU / small-scale flat (VIS)
   
.. _calobs-vis-smallscale-flat:

**CALPRODUCT-VS-022:** VIS Small-scale Flat Field
=================================================

.. include:: definitions.rst

Parent requirement
------------------
| `R-CAL-B-VS-1200 <https://wiki.cosmos.esa.int/euclid/images/1/1d/EUC-MPIA-RD-1-001_CalCD-B_v3.1.pdf#page=98>`_
| `R-CAL-B-VS-2200 <https://wiki.cosmos.esa.int/euclid/images/1/1d/EUC-MPIA-RD-1-001_CalCD-B_v3.1.pdf#page=107>`_
| `R-CAL-B-VS-4210 <https://wiki.cosmos.esa.int/euclid/images/1/1d/EUC-MPIA-RD-1-001_CalCD-B_v3.1.pdf#page=126>`_


Scheduling
----------
Once, during PV phase, and on a monthly basis during the ROS.

Time-critical
-------------
No

Objective
---------

From the LED PRNU (:ref:`calobs-vis-prnu`) master flats, compute the smallscale flatfield for the broad VIS passband. 

Fulfilled by
------------

:ref:`calobs-block-pv-vis-prnu-bfe`

:ref:`calobs-block-f-wide-survey`

Processing input
----------------
:command:`Ground Processing Input Data`: BPM, ground-based QE

:command:`Data Description`: Flat-field and QE cubes


Processing output
-----------------
Effective flat fields for the VIS bandpass. Trend analysis

Required accuracy, constraints
------------------------------
Expected flux levels within TBD%, stable within TBD%, spatial irradiance as expected (within requirement, ground-based measurements)

Processing tools
----------------
L1 small scale flat pipeline, trending statistics

Quality control parameters
--------------------------
DataModel:
`<https://gitlab.euclid-sgs.uk/>`_

Contact person
--------------
VIS instrument scientist  

.. raw:: latex

   \clearpage