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The various files associated with each image represent the stages of
NEWSIPS processing starting with the raw image (RI) file and ending with
the merged extracted image (MX) file containing fluxes, wavelengths and
data quality () flags. The Final Archive FITS files produced for
low-dispersion images include the following:
- RILO
- The RI stored as a FITS primary array. If a partial read was used
to obtain the image, an image extension is included containing the
original unshifted RI (i.e., all corrections for registration errors
are included in the primary array).
- LILO
- The linearized (i.e., photometrically corrected) image (LI) stored as a
primary array with the associated array of flags stored in a FITS
image extension.
- VDLO
- The vector displacements (VD) file contains the vector displacements,
which map raw space into resampled space, and the cross-correlation
coefficients (XC), which describe the mapping from raw space to the
appropriate level of the raw space Intensity Transfer Function (ITF). The
VD are stored as a three-dimensional (3-D) primary array, and the XC
are stored in a FITS binary table extension.
- SILO
- The resampled image (SI) stored as a primary array with the associated
flags in an image extension.
- MXLO
- The MX stored in a binary table extension, with each row containing the
data extracted from one aperture.
If the RILO contains spectra collected through both the large and small
aperture, the VDLO, SILO, and MXLO will contain data from both
apertures. This is a slight change from the IUESIPS processing in which
separate files were created for each aperture.
In the case of a high-dispersion spectrum the following files are
generated:
- RIHI
- The RI (no partial-read image extensions are applicable).
- LIHI
- The LI and associated flags.
- VDHI
- The VD and XC data.
- SIHI
- The SI stored as a primary array, with wavelengths and predicted and
found line positions stored in a binary table extension. The associated
and cosmic ray flags are contained in two image extensions.
- MXHI
- The MX stored in a binary table extension with each row of the table
representing data for one spectral order.
Some images may be processed as both high- and low-dispersion images
and, consequently, will have both sets of files in the archive. In these
cases, two copies of the RI file will appear in the archives, due to the
dispersion-dependent keywords assigned during processing. All low- and
high-dispersion Final Archive file formats are summarized in
Tables 12.1 and 12.2. File sizes and formats summarized as
``various'' in these tables are explicitly described in the subsequent
sections of this chapter.
Table 12.1:
Low-Dispersion File Formats
File ID |
Data Stored |
Size |
Format |
FITS Type |
RILO |
Raw Image |
768x768 |
8-bit |
primary array |
|
Original Raw Image |
768x768 |
8-bit |
image extension |
LILO |
Linearized Image |
768x768 |
I*2 |
primary array |
|
Linearized Flag Image |
768x768 |
I*2 |
image extension |
SILO |
Resampled Image |
640x80 |
I*2 |
primary array |
|
Resampled Flag Image |
640x80 |
I*2 |
image extension |
VDLO |
Vector Displacements |
768x768x2 |
R*4 |
primary array |
|
Cross-correlation Parameters |
various |
various |
binary table extension |
MXLO |
Extracted Spectra |
various |
various |
binary table extension |
|
In the case of partial-reads only. |
Table 12.2:
High-Dispersion File Formats
File ID |
Data Stored |
Size |
Format |
FITS Type |
RIHI |
Raw Image |
768x768 |
8-bit |
primary array |
LIHI |
Linearized Image |
768x768 |
I*2 |
primary array |
|
Linearized Flag Image |
768x768 |
I*2 |
image extension |
VDHI |
Vector Displacements |
768x768x2 |
R*4 |
primary array |
|
Cross-correlation Parameters |
various |
various |
binary table extension |
SIHI |
Resampled Image |
768x768 |
I*2 |
primary array |
|
SIHI wavelengths and |
various |
various |
binary table extension |
|
predicted and found line positions |
|
|
|
|
Resampled Flag Image |
768x768 |
I*2 |
image extension |
|
SIHI Cosmic Ray Image |
768x768 |
8-bit |
image extension |
MXHI |
Extracted Spectra |
various |
various |
binary table extension |
Next: 12.2 FITS Header Format
Up: 12 Final Archive Data
Previous: 12 Final Archive Data
Karen Levay
12/4/1997