fcl, getlimb \- find location of center and radius of limb of solar image.SH SYNOPSIS
.B fcl
\fI[-qv] [argument= value ...]\f
.br
.B getlimb
\fI[-qv] [argument= value ...]\f
.SH DESCRIPTION
\fIfcl\fR and \fIgetlimb\fR find the center and radius of the "best fit"to a circular limb
in a solar image. The limb is defined as the location of the maximumgradient near pixels whose values are approximately equal to\fIfrac_thresh\fR times the average value in a central square. Data inright triangles in the corners are ignored. The only distinction betweenthe two programs is in the format of the output.
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 "fcl command" "options"
.NXR "getlimb command" "options"
.IP \fBin=\fIname\fR 20
The dataset name of the input.
.IP \fBfrac_lenside=\fIfloat\fR 20
size of ignored triangles (default 70/1024).
.IP \fBfrac_box=\fIfloat\fR 20
size of central box for determining threshold (default 200/1024). .IP \fBfrac_thresh=\fIfloat\fR 20
threshold multiplier (default 0.3).
.SH EXAMPLES
.NXR(e) ""
fcl in= /scr24/phil/optest/oct508/lev1/V_mdi/V_mdi.048.fits .br
produces the output:
.br
xc = 132.426, yc = 143.998, radius = 114.626
getlimb in= /scr24/phil/optest/oct508/lev1/V_mdi/V_mdi.048.fits .br
produces the output:
.br
RMAJOR=114.626 X0=132.426 Y0=143.998
.SH FILES
.SH SEE ALSO
.SH DIAGNOSTICS
.SH BUGS
There is no good reason for having two separate programs simply to
provide output strings in different formats. A flag would suffice, if the formats were essential.
Only works for square data arrays. The threshold and corner zeroing
parameters should not have to be supplied.
.SH AUTHOR
Lyle Bacon, based on a routine by Cliff Toner as inherited through
Robert Ronan
.rs
.SH HISTORY
1994-02-14 SOI Version 0.8
.#$Id: fcl.1,v 1.1 1994/02/17 00:10:10 CM Exp $ .#$Source: /home/soi/CM/man/man1/RCS/fcl.1,v $
.#$Author: CM $