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CCDPACK
CCD data reduction package
Version 4.0

Starlink User Note 139.17
Peter W. Draper, Mark Taylor, Alasdair Allan
1 February 2006

CCLRC / Rutherford Appleton Laboratory
Particle Physics & Astronomy Research Council

Starlink Project

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Abstract
Introduction
Starting up CCDPACK
- Getting Help
- Running from the C-shell
Demonstrations and test data
Basic principles of CCD data reduction
How to reduce your data now
- Using the CCDPACK data reduction GUI
  - GUI problems
- Command-line reduction
Data formats
Using the data reduction programs
- Using the automated processing facilities directly
- Using the CCDPACK programs to reduce data
- IR data reduction
Registration and mosaicing
- The registration process
  - More about attached coordinate systems
- Object matching and position lists
- Handling coordinate systems directly
- Re-use of coordinate system information with AST files
- Combining coordinate systems
- Viewing image alignment
- Data resampling
- Mosaicing and normalisation
- Combination by drizzling
- Some registration examples
- Schematic registration sequences
Set processing -- multiple image instruments
- Adding Set headers
- Removing Set headers
- Examining Set headers
- Global parameters with Sets
- Using Sets in reduction tasks
- Using Sets in registration tasks
- Some examples of Set use
  - Data reduction of frames from a mosaic camera
  - Registering frames from a mosaic camera
Parameter behaviour and control
Background processing
The CCDPACK logging system
- Writing your own comments to the log file
Processing lists of data
- Input wildcards
- Indirection
- Output names
Bad data masks (ARD)
Acknowledgements
Acknowledging this software
Notes for IRAF users
Description of the CCDPACK routines
- General considerations
  - Data saturation
  - Data types and sizes
  - Image combination techniques
- Complete routine descriptions
- ASTEXP- Exports coordinate system information from images
- ASTIMP- Imports coordinate system information into images.
- CALCOR- Subtracts a scaled dark or flash calibration image from a series of images
- CCDALIGN- Aligns images graphically by interactive object selection
- CCDCLEAR- Clears CCDPACK global parameters
- CCDEDIT- Edits CCDPACK image extensions
- CCDFORK- Creates a script for executing CCDPACK commands in a background process
- CCDNDFAC- Accesses a list of images and writes their names to a file
- CCDNOTE- Adds a note to the current CCDPACK log file
- CCDSETUP- Sets the CCDPACK global parameters
- CCDSHOW- Displays the value of the CCDPACK global parameters
- DEBIAS- Performs the debiassing and initial preparation of CCD data
- DRAWNDF- Draws aligned images or outlines on a graphics display
- DRIZZLE- Resamples and mosaics using the drizzling algorithm
- FINDCENT- Centroids image features
- FINDOBJ- Locates and centroids image features
- FINDOFF- Performs pattern-matching between position lists related by simple offsets
- FLATCOR- Divides a series of images by a flatfield
- IDICURS- Views and writes position lists interactively
- IMPORT- Imports FITS information into images
- MAKEBIAS- Produces a master from a set of bias frames
- MAKECAL- Produces a dark or pre-flash calibration image
- MAKEFLAT- Produces a flatfield calibration image
- MAKEMOS- Make a mosaic by combining and (optionally) normalising a set of images
- MAKESET- Writes Set header information to images
- PAIRNDF- Aligns images graphically by drag and drop
- PLOTLIST- Draws position markers on a graphics display
- PRESENT- Presents a list of images to CCDPACK
- REDUCE- Automatic CCD data reduction facility (command-line version)
- REGISTER- Determines transformations between lists of positions
- SCHEDULE- Schedules an automated CCDPACK reduction
- SHOWSET- Outputs image Set header information
- TRANLIST- Transform lists of positions
- TRANNDF- Transforms a list of images by resampling
- WCSEDIT- Modifies or examines image coordinate system information
- WCSREG- Aligns images using multiple coordinate systems
- XREDUCE- Starts the automated CCD data reduction GUI
Using TRANSFORM structures for registration
- Handling TRANSFORM structures
- Transforming position lists
Memory requirements
A glossary of CCD terminology
- The bias level
- Readout-noise
- Bias strips
- ADC factor
- Saturation
- Dark current
- Pre-flashing
- Flatfielding
- Fringing
Changes
- Release 2.0
- Release 2.0-2
- Release 2.1
- Release 2.2
- Release 2.2-1
- Release 2.3-0
- Release 2.3-1
- Release 2.4-0
- Release 3.0-0
- Release 3.0-1
- Release 3.1-0
- Release 3.1-1
- Release 4.0-10
- Release 4.0-11
- Release 4.0-12
- Release 4.0-14
- Release 4.0-15
- Release 4.0-16
- Release 4.0-17
- Release 4.0-18
- Release 4.0-19
- Release 4.0-20
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Next: Abstract

CCDPACK CCD data reduction package Version 4.0

CCLRC / Rutherford Appleton Laboratory Particle Physics & Astronomy Research Council

Starlink Project

Contents

CCDPACK
CCD data reduction package
Version 4.0

CCLRC / Rutherford Appleton Laboratory
Particle Physics & Astronomy Research Council