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+.help obslogoverlay Mar12 votools
+.ih
+NAME
+obslogedoverlay -- Overlay observation logs in the image display
+.ih
+USAGE
+obslogoverlay input mission
+.ih
+PARAMETERS
+.ls input
+Input image or field name.
+.le
+.ls mission
+Mission name.  A small set of space based missions are supported directly,
+however the task can be easily modified to add other available observation
+logs.
+.le
+.ls size = 0.25
+Field size in degrees.  If the \fIinput\fR parameter is not an image, it is
+assumed to be an object name, the query will be for all observations within
+\fIfield\fR degrees of the field center.
+.le
+.ls frame = 1
+Display frame.
+.le
+.ls display = yes
+Display the image/field?  If enabled, the input image or a DSS image of
+the field will be displayed before overlaying the catalog.
+.le
+.ls print = no
+List the observations on the standard output?
+.le
+.ls mkcolor = 0
+Marker color.  If zero, a predefined color for each mission will be used.
+.le
+.ls mksize = 60
+Marker size (arcsec).
+.le
+.ls maxobs = 0
+Max observations to draw.  If zero, all returned results are displayed.
+.le
+.ls verbose = no
+Print actions?
+.le
+.ls status = 0
+Service status code.
+.le
+
+.ih
+DESCRIPTION
+
+The \fIOBSLOGOVERLAY\fR task is used to overlay markers indicating
+observations from the selected space mission.  The \fIinput\fR parameter
+may be either an image name containing a valid WCS, or the name of an
+object that will be used to form the query.  If an image, the WCS
+footprint will determine the query size, otherwise the \fIsize\fR
+parameter will specify the query size.
+
+The \fImission\fR parameter specifies which mission's observations are
+to be queried.  Currently allowed values are:
+.nf
+	EXOSAT 	    FUSE 	HST
+	IUE 	    Spitzer 	XMM
+.fi
+Additional missions and ground-based observation logs will be added
+in future versions.  This task is meant as a convenience application,
+using other tasks in the \fIVOTOOLS\fR package any observation log
+available from the VO could be overlayed using a small script task.
+
+If the \fIdisplay\fR task is enabled, the \fIinput\fR image (or a DSS
+field containing the named object) will be displayed to frame
+\fIframe\fR in the image display.  The \fIprint\fR parameter may be used to
+list instead of overlay the observation positions.
+
+Markers indicating the center of the observation will be drawn using a
+size (in arcsec) specified by the \fImksize\fR parameter.  If the
+\fImkcolor\fR parameter is zero, a pre-determined marker color will be
+used for each mission, allowing multiple missions to be overlayed.  The
+\fImaxobs\fR parameter can be used to limit the number of markers drawn
+on the display.  Note that no attempt is made to drawn a realistic
+instrumental footprint.
+
+.ih
+EXAMPLES
+1. Overlay the IUE observations of the dev$ypix test image:
+.nf
+    votools> obslogoverlay dev$ypix iue maxobs=30
+or
+    votools> obslogoverlay m51 iue size=0.2 display+ frame=1 maxobs=50
+.fi
+
+.ih
+REVISIONS
+
+.ih
+SEE ALSO
+radiooverlay, xrayoverlay, nedoverlay
+.endhelp