ATIS93 - Image File Naming Conventions

Image File Naming Conventions

500 Series

The data generated by taking a typical CCD image does not lend itself well to transmission in ASCII format and there is a well established format for this form of data. The "Flexible Image Transport System" (FITS) format is used by ATIS for the transfer of all CCD images. ATIS provides a logging function by maintaining the record of how the files were generated and provides pointers to the data in the form of file names. The following CCD file naming format is recommended for use with the ATIS 500 series statements:

TJJJJJYY.FIT

Where T has been assigned for the following file types:

P Picture or image file
F Flat field image file
D Dark field image file
C Calibration image file
B Bias field image
JJJJJ Last five digits of the Julian Date
YY Alpha code for the sequence of images
taken on a given night observing run, i.e.,
AA AB AC.... ZW ZY ZZ
This allows up to 676 images of each type per night.
FIT The FITS file format extension. Either FIT or FITS is acceptable.
Generally FITS is used on systems which will accept longer extensions,
such as UNIX, and FIT is used on DOS based systems which are
restricted to three character file extensions.

The above file name format should be self explanatory except for the CJJJJJYY file type. This prefix is included as a means of identifying calibration images, so that future identification of these images can be simplified. It also identifies this important type of images as a separate class.

500 Series

Statement 501

P	Picture or image file
F	Flat field image file
D	Dark field image file
C	Calibration image file
B	Bias field image
JJJJJ	Last five digits of the Julian Date
YY	Alpha code for the sequence of images taken on a given night observing run, i.e., AA AB AC.... ZW ZY ZZ This allows up to 676 images of each type per night.
FIT	The FITS file format extension. Either FIT or FITS is acceptable. Generally FITS is used on systems which will accept longer extensions, such as UNIX, and FIT is used on DOS based systems which are restricted to three character file extensions.