PDS_VERSION_ID = PDS3
RECORD_TYPE = "STREAM"
OBJECT = TEXT
PUBLICATION_DATE = 2010-09-10
NOTE = "Description of the contents of the CALIB/ directory"
END_OBJECT = TEXT
CALIB Directory Contents
This file describes the contents of the calibration directory. The EPOXI
calibration pipeline uses the files in this directory to calibrate raw data
from the EPOXI mission; many of the files are duplicates of those for Deep
Impact. The files are derived from analysis of pre-launch thermal-vacuum
data as well as from in-flight calibrations performed during the Deep Impact
and EPOXI missions. For more information about these files, the analyses,
and the calibration pipeline, see the Deep Impact instrument calibration
paper included on the Deep Impact and EPOXI documentation data set,
The calibration data are provided as FITS image files or ASCII tables.
The following file naming convention is used:
| | | | | |
| | | | | Optional filter number (1 through 9), temperature,
| | | | | or place holder value such as '999'
| | | | |
| | | | Instrument image mode (1 through 9) or a place
| | | | holder value of '0' to indicate all modes
| | | |
| | | File version number (1, 2, etc.) for the given
| | | effective date
| | |
| | Date from which file is effective. It is not the file
| | creation date. A value of '020601' indicates the file was
| | created from pre-launch thermal-vacuum data. The value
| | '000101' is used as a place holder. It provides no useful
| | information but is required to keep the pipeline running.
| Instrument designation (e.g. MRIVIS for MRI)
Directory for the type of calibration file (e.g. FLAT for flat fields)
Here is an example of a complete file name, FLAT/MRIVIS_020601_2_1_9.FIT:
- FLAT Flat field
- MRIVIS MRI Instrument
- 020601 Effective date of 2002-06-01; this flat can be applied
to data acquired on 2002-06-01 UTC or later
- 2 Version 2 of the file for the specified effective date
- 1 Instrument image mode 1
- 9 Filter 9
- .FIT FITS file
Calibration files are grouped into subdirectories by type:
This subdirectory contains ASCII text tables of the absolute calibration
constants for all instrument (image) modes. The first column in a table
specifies the constant for converting raw data numbers to units of
radiance, W/(m**2 sr um). The second column specifies the constant for
converting from units of radiance to units of reflectance (i.e., I-over-F
or the observed radiance over the input solar radiance, unitless).
This subdirectory contains a look up table for the correction of uneven
bit weighting caused by the analog-to-digital conversion. The single
table applies to all instrument modes. As of this archive, the
corrections had not been derived. Therefore, the input pixel values are
the same as the output values to prevent the automated calibration
pipeline from changing the data.
This subdirectory contains maps that identify bad pixels for all
instrument modes. Bad pixels are set to a value of 1. Good pixels are
set to 0. Pixels in the serial and parallel overclock columns and rows
are flagged as good (0). For each image mode, there is one row of warm
pixels near the top and bottom edge. These rows are flagged as bad (1).
This subdirectory contains bias correction maps for all instrument
This subdirectory contains the four 8-bit lookup tables used to
decompress raw data numbers.
This subdirectory contains master dark frames for all instrument
This subdirectory contains one transmission profile table for each
This subdirectory contains flat fields for every combination of
instrument mode and filter.
This subdirectory contains a dummy point-spread function file for each
filter. It is a centered delta function to prevent the pipeline from
changing the data.
This subdirectory contains FITS files that specify the amount of gain
from electronic cross talk that occurs between all possible
combinations of the four quadrants of the CCD. There is one file
for each instrument mode.
Name Last modified Size Description
Apache/2.2.15 (Scientific Linux) Server at pdssbn.astro.umd.edu Port 443
Parent Directory -
abscalvs/ 19-Feb-2009 23:07 -
adclut/ 21-Feb-2009 20:45 -
badpix/ 03-Sep-2009 13:09 -
bias/ 22-Feb-2009 23:56 -
decomprs/ 22-Feb-2009 23:58 -
drkmodel/ 24-Feb-2009 23:36 -
filters/ 01-Mar-2009 21:57 -
flat/ 29-Jun-2009 12:25 -
psf/ 08-Aug-2010 01:26 -
xtalk/ 02-Sep-2009 15:19 -
calinfo.txt 09-Sep-2010 14:37 9.6K