IRAF Tools for Mosaic image processing

Version : 4.5
Author(s) : Frank Valdes (
License : AURA
Website :

Installs from Open Source Astronomy for Win32/Cygwin cd 2
Disk space required for installation is 20.47 Mb

This package requires prior installation of iraf


The MSCRED external package is used to reduce CCD mosaic data in which the data is in the mosaic MEF data format.

The data format used by the NOAO Mosaic Data Handling Software (MDHS) is a multiextension FITS (MEF) file. This format is produced by the the Data Capture Agent (DCA) when observing with the NOAO Mosaic. The MEF file for the NOAO Mosaic currently consists of nine FITS header and data units (HDU). The first HDU, called the primary or global header unit, contains only header information which is common to all the CCD images. The remaining eight HDUs, called extensions, contain the images from the eight CCDs.

The fact that the image data is stored as a FITS file is not significant. Starting with IRAF V2.11, FITS files consisting of just a single primary image may be used in the same way as any other IRAF image format. The significant feature of the mosaic format is its multi-image structure.

With multiextension FITS files you must either use tasks which are specifically designed to operate on these files as a unit or explicitly specify the image within the file that is to be operated upon by general IRAF image processing tasks. The tasks in the \fBmscred\fR package are designed to operate on the mosaic MEF files and so you only need to specify the filename.