blob: 52dc0c7023a859cca36c690aaba1809994434cda (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
.help skstatd Mar00 Skywcs
.ih
NAME
skstatd -- get a double sky coordinate descriptor parameter
.ih
SYNOPSIS
include <skywcs.h>
dval = sk_statd (coo, parameter)
.nf
pointer coo # the input sky coordinate descriptor
int parameter # the double parameter to be returned
.fi
.ih
ARGUMENTS
.ls coo
The sky coordinate descriptor.
.le
.ls parameter
The oarameter to be returned. The double parameter definitions in skywcs.h are:
.nf
S_VXOFF # the logical ra / longitude offset in pixels
S_VYOFF # the logical dec / latitude offset in pixels
S_VXSTEP # the logical ra / longitude step size in pixels
S_VYSTEP # the logical dec / latitude step size in pixels
S_EQUINOX # the equinox in years
S_EPOCH # the MJD of the observation
.fi
.le
.ih
DESCRIPTION
Sk_statd returns the values of double sky coordinate descriptor parameters.
.ih
NOTES
The offsets and step sizes default to 0 and 1 for both axes. However
if the sky coordinate descriptor was derived from an input image section, e.g.
"dev$ypix[100:300,100:300]" these numbers may assume other values in some
circumstances.
The equinox and epoch of observation are normally set by the calling program
when the sky coordinate descriptor is initialized, e.g. they default
to 2000.0 and 51544.50000 if the input coordinate system was "fk5".
.ih
SEE ALSO
skstati, skstats
.endhelp
|
