gongprep \- process raw GONG data images
.SH SYNOPSIS
.B gongprep
\fI[-cqv] [argument= value ...]\f
.SH DESCRIPTION
\fIgongprep\fR provides the necessary preprocessing of a series ofraw GONG Dopplergrams for mapping into heliographic coordinates.The sky position angle and physical ephemerides are calculated
from the time, and the center and radii of the best fit ellipse to the limb are determined for each image.
Mainly it just sets a bunch of attributes in the dataset.
The \fB\-c\fR option applies a constant calibration factor to the input
values.
The \fB\-q\fR option prints out the list of required arguments and their
default or environmental values, then quits. The \fB\-v\fR option sets \fIverbose\fR mode, redirecting history from \fIstdout\fR to \fIstderr\fR.
.NXR ""
.SH OPTIONS
.NXR "module command" "options"
.IP \fBin=\fIDataset_Name\fR 20
input dataset (default: gong.fits)
.IP \fBout=\fIDataset_Name\fR 20
output dataset (default: gong.prepped.fits)
.IP \fBcalib=\fIReal\fR 20
calibration factor (default: -1.0)
.IP \fBrc=\fIReal\fR 20
semi-major axis of ellipse on image beyond which values are ignored for purposes of determining the gradient (default: 0.5) .IP \fBstart_t=\fIString\fR 20
starting time of the dataset (default: 1991:06:30_15h:14m) .IP \fBref_t=\fIString\fR 20
time at which the sky position angle is 0 (default: 1991:06:30_07h:39m) .IP \fBdelta_t=\fIString\fR 20
temporal cadence of succesive sequence numbers in the dataset (default: 60s)
.SH EXAMPLES
.NXR(e) ""
.SH FILES
.SH SEE ALSO
sds_gongprep(3), solephem(3)
.SH DIAGNOSTICS
.SH BUGS
The module is probably obsolescent. It would be better to do something
than to just rewrite the dataset with new headers.
The fitting of the velocity gradient to verify position angle is not
actually used. The limb fit must already be supplied in the input data. Several of the output attribute have a mismatch between declared type
and attribute type.
.SH AUTHOR
Kay Leibrand
.rs
.SH HISTORY
1994-02-14 SOI Version 0.8
.#$Id: gongprep.1,v 1.1 1994/02/17 00:10:10 CM Exp $ .#$Source: /home/soi/CM/man/man1/RCS/gongprep.1,v $ .#$Author: CM $