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Diffstat (limited to 'pkg/xtools/skywcs/doc/skstatd.hlp')
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diff --git a/pkg/xtools/skywcs/doc/skstatd.hlp b/pkg/xtools/skywcs/doc/skstatd.hlp new file mode 100644 index 00000000..52dc0c70 --- /dev/null +++ b/pkg/xtools/skywcs/doc/skstatd.hlp @@ -0,0 +1,49 @@ +.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 |