This page (revision-13) was last changed on 07-Dec-2016 14:14 by JianSun

This page was created on 25-Sep-2007 17:35 by JianSun

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9 26-Sep-2007 07:20 2 KB David R Williams to previous | to last
8 26-Sep-2007 07:12 2 KB David R Williams to previous | to last Comment by David R Williams
7 25-Sep-2007 18:36 1 KB JianSun to previous | to last
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FitsPointing
FitsPointing

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Here are some suggestions (according to emails between Ignacio U., Ken D.and Viggo H. and John M.):
Here are some suggestions (according to emails between Ignacio U., Ken D., Viggo H. and John M.):
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3. I wrote a simple wrapped idl program called "[eis_getpinfo.pro|FitsPointing/eis_getpinfo.pro]" to extract pointing information from EIS fits file (no need to read full fits file)
3. I wrote a simple wrapped idl program called "[eis_getpinfo.pro|FitsPointing/eis_getpinfo.pro]" to extract pointing information from EIS fits file (ie no need to read full fits file)
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Hope this helps. :)
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Hi, Jian
Thanks for doing this! Really useful not to have to read a whole FITS file -- especially the [huge files we recently discussed|~BigEISFitsFiles]!
On a point of refinement -- and this is something we should consider in the team meeting in October -- I'm not sure that we can really speak of a single EIS pointing. The reason I say this is the [North-South offset of about 20"|~CCDOffset] between the two wavelength channels, and also the [1" East-West offset|~CCDOffsetX] between them. In a sense, each wavelength channel has its ''own'' pointing. But perhaps this is factored into your routine already?
Does [EIS_PREP|~DataAnalysisRoutines] correct for these offsets?
--[David R Williams|~DavidRWilliams], 26-Sep-2007
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Hi David,
Your comments are valuable. Thanks.
I don't think [EIS_PREP|~DataAnalysisRoutines] corrects these offsets, people have to do it by themself manually.
There is a preliminary report from Deb (MSSL) to show the shifts between SW & LW CCDs and XRT. The fits file has 22 lines: 8 lines in SW CCD and 14 lines in LW CCD:
Y shifts (arcsec):
{{{[20,20,20,20,20,19,19,19] (SW) [4,2,2,2,3,0,0,1,1,1,0,0,0.5,3] (LW)}}}
X shifts (arcsec):
{{{[0,0,0,0,0,0,0,0.5] (SW) [3,3,1,1,1,3,0,1,1,2,3,3,2,1] (LW)}}}
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This page (revision-13) was last changed on 07-Dec-2016 14:14 by JianSunTop