IRTS-FILM-155_Image_2.1 directory definition

 2016.01.25:  Kuriko Inada, Akira Yoshino, Keiichi Matsuzaki
 2021.07.09:  Tae Furusho
 2021.09.07:  Tae Furusho
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* Preamble
------------
The data of IRTS (Infrared Telescope in Space) have been stored from 2001 to 2002 by DARTS (http://darts.isas.jaxa.jp). 
To simplify the data location, we reorganized them in 2016. 
Each new directory name was given like as "IRTS_[Product]", so that it shows obviously a product name.


* Version number assignment
----------------
To identify the versions for the product (one set of data), the version numbers are assigned to each directory name like as "IRTS_[Product]_[version]". 
Based on the following information, we defined appropriately the numbers. 
   - Description of the header of the data file
   - Comment in the document for the data
   - Description of the release history in the web page:
     http://darts.isas.jaxa.jp/astro/irts/history.html
   - Result of inquiry to the data producer


* Change history
------------------
The IRTS-FILM-155_Image_2.1 directory has been made by DARTS.
We moved all the files related closely with the product into this directory as follows. 

----------------------------------------------------------------
http://darts.isas.jaxa.jp/
	pub/irts/film/film_map_data/		
		155/
			FILM_155_Synopsis.txt
			film-155-[ns|ss]??-err.fits
			film-155-[ns|ss]??-flag.fits
			film-155-[ns|ss]??-intp.fits
			film-155-[ns|ss]??-raw.fits
			film-155-[ns|ss]??-smp.fits
	pub/irts/misc/documents/
		film_readme.txt
	astro/irts/maps/[ns|ss]??/
                film-155-[ns|ss]??.gif
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 |
 V
 V
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http://darts.isas.jaxa.jp/pub/irts/IRTS-FILM-155_Image_2.1/
                FILM_155_Synopsis.txt
		README_byDARTS.txt (this file)
		film_readme.txt
                film-155-[ns|ss]??-err.fits
                film-155-[ns|ss]??-flag.fits
                film-155-[ns|ss]??-intp.fits
                film-155-[ns|ss]??-raw.fits
                film-155-[ns|ss]??-smp.fits
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* Caveat (2021.7.9)
--------------------
Recently, problems are found in the ver. 2.1 data (IRTS-FILM-155_Image_2.1) for the following 7 scan regions:

North Scan (ns) : 18, 20, 21, 29
South Scan (ss) : 18, 21, 44

There are pixels with incorrect values in these datasets.
Please use ver.2.0 data instead for these regions (IRTS-FILM-155_Image_2.0).
We apologize for the inconvenience.


* Caveat (2021.9.7)
--------------------
For the South Scan region No.20 (ss20), the CRVAL2 value was fixed from "-1.0.5E+01" to "-1.05E+01".

eof.