Tuto3AMBERDataReduction < Jmmc/VltiSchool2010

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---+ Here you can find the information related to the AMBER data reduction practice session

The practice session is based on the user manual of the AMBER data reduction software, especially the cookbook of section 4. You can access it by following this link: [[http://www.jmmc.fr/doc/approved/JMMC-MAN-2720-0001.pdf]]. The AMBER data reduction software is available on the JMMC webpage: 
[[http://www.jmmc.fr/data_processing_amber.htm][http://www.jmmc.fr/data_processing_amber.htm]]. 

The material of this practice session can be accessed in subdirectories of your ==/home/school/data/amber== directory. You will first reduce the sample dataset in the directory ==alfara== together with the teachers, and then will be left alone to reduce a complete dataset on the star HD87643, situated in the ==HD87643_AMBER== directory

A complete sequence of [[amdlibYorickCommands][amdlib yorick commands]] can be found here to reduce a dataset.

Once you have reduced all the nights of AMBER data, you will have a series of ==PRODUCT_HD87643_*.fits== files in the ==2008-*-*/2008-*-*_3.0b4_OIDATA_AVG/== directories. You can then type the following command to pack all the files together in a single directory: 
==cp /home/linux/Tuto_amber/HD87643_AMBER/2008-*-*/2008-*-*_3.0b4_OIDATA_AVG/PRODUCT_HD87643*.fits /home/linux/Tuto_amber/HD87643_AMBER/RESULTS/==

Then you can select a wavelength interval with an additional ==yorick== script called ==amdlibPipeline.i==. To load it, once in ==yorick==, please type ==include,"amdlibPipeline.i"==. Then, type ==help, filterOiFile==. For example, if you wish to keep only the K-band, type ==filterOiFile, wlenRange=[2.05,2.45]*1e-6== and apply the script to all the product files together. You will have new files created which you can put then in the ==/home/linux/Tuto_amber/HD87643_AMBER/RESULTS/FILTERED/== subdirectory.

Then, the last step is to pack all the files into a singla oi fits file. To do that, you can for example go to the ==/home/linux/Tuto_amber/HD87643_AMBER/RESULTS/FILTERED/== subdirectory and type into a console (NOT in yorick!) ==oifits-merge HD87643_Kband.oifits *.fits==.

You should have then a ==HD87643_Kband.oifits== file that you will be able to use for the model-fitting and image reconstruction tutorials!


Additionnally, you should use gasgano (just type ="gasgano"=) to look at the structure of all the files in, e.g., the ==/home/school/data/amber/alfara== data. Use =fv= to look at the innnards of fits files.

Some references that may be useful for this session:

   * [[http://www.vlti.org/events/assets/2/proceedings/porto-11.pdf][Interferometric data processing]]

   * [[http://www.vlti.org/events/assets/1/proceedings/4.3_Tatulli-Duvert.pdf][AMBER data reduction, Goutelas Book]]. Note that the software from which the illustrations were derived has evolved a lot since. You will use the last version of both the AMBER data reduction library (amdlib v3.0) and of the Yorick interface.


-- Main.TWikiGuest - 2010-05-18

I	Attachment	History	Action	Size	Date	Who	Comment
png	4.png	r1	manage	30.5 K	2010-05-19 - 16:20	TWikiGuest	illustration on the spectral mixing at the band edges for JHK mode
i	amdlibCalibrate.i	r1	manage	75.2 K	2010-05-19 - 08:12	TWikiGuest
c	amdlibDark.c	r1	manage	25.6 K	2010-05-20 - 09:23	TWikiGuest
i	amdlibPipeline.i	r1	manage	359.5 K	2010-05-18 - 19:29	TWikiGuest

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