This page (revision-10) was last changed on 18-Apr-2021 19:22 by LouisaBradley

This page was created on 17-Oct-2008 12:33 by JianSun

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Version Date Modified Size Author Changes ... Change note
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9 08-Jul-2010 09:47 5 KB LouisaBradley to previous | to last
8 08-Jul-2010 09:46 5 KB LouisaBradley to previous | to last
7 20-May-2010 12:08 4 KB LouisaBradley to previous | to last
6 19-May-2010 15:54 4 KB LouisaBradley to previous | to last
5 13-Aug-2009 14:28 2 KB LouisaBradley to previous | to last Comment by LouisaBradley
4 17-Oct-2008 13:08 2 KB JianSun to previous | to last
3 17-Oct-2008 12:36 2 KB JianSun to previous | to last
2 17-Oct-2008 12:35 2 KB JianSun to previous | to last
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__When EIS_PREP is running I've noticed that it has used hot and warm pixel maps from different days, why is this?__
Following an update to the EIS reformatter software (Feb 2010) the 'recovered' data for REGCAL071 and REGCAL072 can now be used to provide hot and warm pixel maps. Previous to this change the recovered data could not be trusted as it did not appear in the correct position of the CCD. When a file is recovered it means that some of the data is missing, in the case of the REGCAL071 and REGCAL072 files (which are FULL CCD exposures) typically a CCD half will be missing, i.e. 25% of the data cannot be used. See the attachment above for an image showing a recovered REGCAL072 file. The remaining 75% of the data can be used and is processed as normal.
When EIS_PREP selects the pixel maps that are closest in time to the science observation, it may be that the closest in time are from a recovered file and as one (or more) of the pixel maps are missing it will then have to search for the next closest in time pixel maps. For example if you have a science study (full CCD image, 1024 CCD pixel height) from 10 May 2010 and you run EIS_PREP it will select the hot and warm pixel maps from 11 May 2010 (closest in time). It will find pixel maps for the short wavelength CCD but not a complete set for the long wavelength CCD. EIS_PREP will then search for the missing pixel map from the next closest in time data which would be 07 May 2010.
--[LouisaBradley|http://null], 19-May-2010
This page (revision-10) was last changed on 18-Apr-2021 19:22 by LouisaBradleyTop