Simple Footprint Previewing Specification and Prototype

RequirementsFrancesco Pierfederici

ImplementationQuot homines tot sententiae

• “[…] requirements for displaying simple footprint information for any given observation on the sky.”

• FoVs described in RESOURCE elements in the same VOTable document as the data points.

• FoV as sequence of STC Regions.• Each dataset references a FoV instance in the

document.

Status

•Requirements document (http://wiki.eurovotech.org/bin/view/VOTech/SFoVReqs) - collaboration with CDS.

•Reference prototype client - CDS. •FoV descriptions for ESO WFI and FORS1

(std res and hi res).

<RESOURCE> <PARAM ID="J2000" name="Coord Frame" datatype="char" utype="stc:AstroCoordSys/SpaceFrame/SpaceRefFrame" value="J2000.0"/> <DESCRIPTION>Dataset List</DESCRIPTION> <TABLE> <!-- the three following FIELDS borrow their utype from AstroCoordSys for the FOV --> <FIELD name="RA" ucd="pos.eq.ra;meta.main" ref="J2000" datatype="char" arraysize="11" unit="h:m:s" utype="stc:AstroCoordSys/SpaceFrame/OffsetCenter[1]"/> <FIELD name="DEC" ucd="pos.eq.dec;meta.main" ref="J2000" datatype="char" arraysize="11" unit="d:m:s" utype="stc:AstroCoordSys/SpaceFrame/OffsetCenter[2]"/> <FIELD name="PA" ucd="pos.posAng" datatype="float" unit="deg" utype="stc:AstroCoordSys/SpaceFrame/PositionAngle"/> <FIELD name="DATASET_ID" ucd="meta.id" datatype="char" arraysize="28" /> <FIELD name="INSTRUMENT" ucd="meta.id;instr" datatype="char" arraysize="13" /> <!-- The utype of this FIELD means that it contains the id attribute of the --> <!-- the spatial (ucd=pos) support of characterization/coverage, which is exactly --> <!-- the Field of View --> <FIELD name="FoVRef" datatype="char" arraysize="20" utype="ivoa:characterization/[ucd=pos]/coverage/support/@id" /> <FIELD name="COLOUR" datatype="int" /> <DATA> <TABLEDATA> <TR> <TD>20:48:16.76</TD> <TD>-40:10:35.2</TD> <TD>10.5</TD> <TD>FORS1.2004-07-23T07:36:08.899</TD> <TD>FORS1</TD> <TD>FakeInstrFoV</TD> <TD>10</TD> </TR> <TR> <TD>20:48:16.10</TD> <TD>-40:11:08.8</TD> <TD>0.0</TD> <TD>FORS1.2004-07-30T08:18:53.053</TD> <TD>FORS1</TD> <TD>FakeInstrFoV</TD> <TD>10</TD> </TR> </TABLEDATA> </DATA> </TABLE> </RESOURCE>

<RESOURCE ID="FakeInstrFoV" name ="Fake Instrument Field of View" utype="ivoa:characterization/[ucd=pos]/coverage/support" > <DESCRIPTION>Ficticious FoV made up of a two identical rectangle"s separated by 5 arcsec. Each rectangle has dimensions 2' x 5'. </DESCRIPTION> <!-- These two complete the Field of View Coordinate system --> <PARAM name="FOV Coord Frame" datatype="char" utype="stc:AstroCoordSys/SpaceFrame/SpaceRefFrame" value="J2000.0"/> <PARAM name="FOV Coord Flavor" datatype="char" utype="stc:AstroCoordSys/SpaceFrame/CoordFlavor" value="CARTESIAN"/> <TABLE ID="fovT1" name="Field of View"> <PARAM name="Region" value="Polygon" /> <!-- here comes the description of the Vertexes in the tilted and recentered frame --> <FIELD ID="VRO" name="VertexRAOffset" datatype="float" unit="arcsec" utype="stc:AstroCoordArea/Region/reg:Polygon/Vertex/Position[1]"/> <FIELD ID="VDO" name="VertexDecOffset" datatype="float" unit="arcsec" utype="stc:AstroCoordArea/Region/reg:Polygon/Vertex/Position[2]"/> <DATA> <TABLEDATA> <TR><TD>-2.5</TD><TD>-150.0</TD></TR> <TR><TD>-122.5</TD><TD>-150.0</TD></TR> <TR><TD>-122.5</TD><TD>150.0</TD></TR> <TR><TD>-2.5</TD><TD>150.0</TD></TR> </TABLEDATA> </DATA> </TABLE> <TABLE ID="fovT2" name="Field of View"> <PARAM name="Region" value="Polygon" /> <FIELD ref="VRO" /> <FIELD ref="VDO" /> <DATA> <TABLEDATA> <TR><TD>122.5</TD><TD>-150.0</TD></TR> <TR><TD>2.5</TD><TD>-150.0</TD></TR> <TR><TD>2.5</TD><TD>150.0</TD></TR> <TR><TD>122.5</TD><TD>150.0</TD></TR> </TABLEDATA> </DATA> </TABLE> </RESOURCE>

Future Developments

• FoV descriptions in separate XML files?• Publication of FoV descriptions for ESO

instruments.