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Timestamp:
Sep 17, 2015, 4:58:58 PM (11 years ago)
Author:
watersc1
Message:

As I'm leaving today, I need to commit my changes to the schema votables. These are consistent with the current trunk version, and column changes are documented on the wiki ​http://svn.pan-starrs.ifa.hawaii.edu/trac/ipp/wiki/ippToPSPSSAS39CZWNotes

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  • trunk/ippToPsps/config/tables.DF.vot

    r38723 r38751  
    44  <RESOURCE>
    55    <TABLE name="DiffMeta">
    6       <DESCRIPTION>VOTable description of PSPS table DiffMeta</DESCRIPTION>
     6      <DESCRIPTION>Contains metadata related to a difference image constructed by subtracting the stacked image from the single epoch data.  The astrometric calibration of the reference stack is listed.</DESCRIPTION>
    77      <PARAM arraysize="1" datatype="char" ucd="meta.bib.author" name="Author" value="PSPS"></PARAM>           
    88      <FIELD name="diffMetaID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    9         <DESCRIPTION>diff identifier</DESCRIPTION>
     9        <DESCRIPTION>Unique difference identifier.</DESCRIPTION>
    1010      </FIELD>
    1111      <FIELD name="batchID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    12         <DESCRIPTION>batch identifier</DESCRIPTION>
     12        <DESCRIPTION>Internal database batch identifier.</DESCRIPTION>
    1313      </FIELD>
    1414      <FIELD name="surveyID" arraysize="1" datatype="unsignedByte" unit="dimensionless" default="NA">
    15         <DESCRIPTION>survey flag identifier</DESCRIPTION>
     15        <DESCRIPTION>Survey identifier.  Details in the Survey table.</DESCRIPTION>
    1616      </FIELD>
    1717      <FIELD name="filterID" arraysize="1" datatype="unsignedByte" unit="dimensionless" default="NA">
    18         <DESCRIPTION>filter identifier</DESCRIPTION>
     18        <DESCRIPTION>Filter identifier.  Details in the Filter table.</DESCRIPTION>
    1919      </FIELD>
    2020      <FIELD name="diffTypeID" arraysize="1" datatype="unsignedByte" unit="dimensionless" default="0">
    21         <DESCRIPTION>diff type identifier</DESCRIPTION>
     21        <DESCRIPTION>Difference type identifier.  Details in the DiffType table.</DESCRIPTION>
    2222      </FIELD>
    2323      <FIELD name="posImageID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    … …  
    2727        <DESCRIPTION>negative image identifier</DESCRIPTION>
    2828      </FIELD>
     29      <FIELD name="tessID" arraysize="1" datatype="unsignedByte" unit="dimensionless" default="0">
     30        <DESCRIPTION>Tessellation identifier.  Details in the TessellationType table.</DESCRIPTION>
     31      </FIELD>
     32      <FIELD name="projectionID" arraysize="1" datatype="short" unit="dimensionless" default="-1">
     33        <DESCRIPTION>Projection cell identifier.</DESCRIPTION>
     34      </FIELD>
    2935      <FIELD name="skyCellID" arraysize="1" datatype="float" unit="dimensionless" default="NA">
    30         <DESCRIPTION>single float givijng PrimaryCell.SkyCell identifier</DESCRIPTION>
     36        <DESCRIPTION>Skycell region identifier.</DESCRIPTION>
    3137      </FIELD>
    3238      <FIELD name="photoCalID" arraysize="1" datatype="int" unit="dimensionless" default="NA">
    33         <DESCRIPTION>photometry code</DESCRIPTION>
    34       </FIELD>
    35       <FIELD name="magSat" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    36         <DESCRIPTION>saturation magnitude level</DESCRIPTION>
    37       </FIELD>
    38       <FIELD name="analVer" arraysize="100" datatype="char" unit="alphanumeric" default="-999">
    39         <DESCRIPTION>analysis version index</DESCRIPTION>
     39        <DESCRIPTION>Photometric calibration identifier.  Details in the PhotoCal table.</DESCRIPTION>
     40      </FIELD>
     41      <FIELD name="magSat" arraysize="1" datatype="float" unit="magnitudes" default="-999">
     42        <DESCRIPTION>Saturation magnitude.</DESCRIPTION>
     43      </FIELD>
     44      <FIELD name="analysisVer" arraysize="100" datatype="char" unit="dimensionless" default="">
     45        <DESCRIPTION>IPP software analysis release version.</DESCRIPTION>
    4046      </FIELD>
    4147      <FIELD name="expTime" arraysize="1" datatype="float" unit="seconds" default="-999">
    42         <DESCRIPTION>exposure time of positive image</DESCRIPTION>
    43       </FIELD>
    44       <FIELD name="ctype1" arraysize="100" datatype="char" unit="alphanumeric" default="8000">
    45         <DESCRIPTION>name of astrometric projection in RA</DESCRIPTION>
    46       </FIELD>
    47       <FIELD name="ctype2" arraysize="100" datatype="char" unit="alphanumeric" default="8000">
    48         <DESCRIPTION>name of astrometric projection in DEC</DESCRIPTION>
     48        <DESCRIPTION>Exposure time of positive image.</DESCRIPTION>
     49      </FIELD>
     50      <FIELD name="ctype1" arraysize="100" datatype="char" unit="dimensionless" default="">
     51        <DESCRIPTION>Name of astrometric projection in right ascension.</DESCRIPTION>
     52      </FIELD>
     53      <FIELD name="ctype2" arraysize="100" datatype="char" unit="dimensionless" default="">
     54        <DESCRIPTION>Name of astrometric projection in declination.</DESCRIPTION>
    4955      </FIELD>
    5056      <FIELD name="crval1" arraysize="1" datatype="double" unit="degrees" default="-999">
    51         <DESCRIPTION> RA corresponding to reference pixel</DESCRIPTION>
     57        <DESCRIPTION>Right ascension corresponding to reference pixel.</DESCRIPTION>
    5258      </FIELD>
    5359      <FIELD name="crval2" arraysize="1" datatype="double" unit="degrees" default="-999">
    54         <DESCRIPTION> DEC corresponding to reference pixel</DESCRIPTION>
    55       </FIELD>
    56       <FIELD name="crpix1" arraysize="1" datatype="double" unit="dimensionless" default="-999">
    57         <DESCRIPTION>reference pixel value for RA</DESCRIPTION>
    58       </FIELD>
    59       <FIELD name="crpix2" arraysize="1" datatype="double" unit="dimensionless" default="-999">
    60         <DESCRIPTION>reference pixel value for DEC</DESCRIPTION>
     60        <DESCRIPTION>Declination corresponding to reference pixel.</DESCRIPTION>
     61      </FIELD>
     62      <FIELD name="crpix1" arraysize="1" datatype="double" unit="sky pixels" default="-999">
     63        <DESCRIPTION>Reference pixel for right ascension.</DESCRIPTION>
     64      </FIELD>
     65      <FIELD name="crpix2" arraysize="1" datatype="double" unit="sky pixels" default="-999">
     66        <DESCRIPTION>Reference pixel for declination.</DESCRIPTION>
    6167      </FIELD>
    6268      <FIELD name="cdelt1" arraysize="1" datatype="double" unit="degrees/pixel" default="-999">
    63         <DESCRIPTION>scale factor for RA</DESCRIPTION>
     69        <DESCRIPTION>Pixel scale in right ascension.</DESCRIPTION>
    6470      </FIELD>
    6571      <FIELD name="cdelt2" arraysize="1" datatype="double" unit="degrees/pixel" default="-999">
    66         <DESCRIPTION>scale factor for DEC</DESCRIPTION>
     72        <DESCRIPTION>Pixel scale in declination.</DESCRIPTION>
    6773      </FIELD>
    6874      <FIELD name="pc001001" arraysize="1" datatype="double" unit="dimensionless" default="-999">
    69         <DESCRIPTION>elements of rotation/scale matrix</DESCRIPTION>
     75        <DESCRIPTION>Linear transformation matrix element between image pixel x and right ascension.</DESCRIPTION>
    7076      </FIELD>
    7177      <FIELD name="pc001002" arraysize="1" datatype="double" unit="dimensionless" default="-999">
    72         <DESCRIPTION>elements of rotation/scale matrix</DESCRIPTION>
     78        <DESCRIPTION>Linear transformation matrix element between image pixel y and right ascension.</DESCRIPTION>
    7379      </FIELD>
    7480      <FIELD name="pc002001" arraysize="1" datatype="double" unit="dimensionless" default="-999">
    75         <DESCRIPTION>elements of rotation/scale matrix</DESCRIPTION>
     81        <DESCRIPTION>Linear transformation matrix element between image pixel x and declination.</DESCRIPTION>
    7682      </FIELD>
    7783      <FIELD name="pc002002" arraysize="1" datatype="double" unit="dimensionless" default="-999">
    78         <DESCRIPTION>elements of rotation/scale matrix</DESCRIPTION>
     84        <DESCRIPTION>Linear transformation matrix element between image pixel y and declination.</DESCRIPTION>
    7985      </FIELD>
    8086      <FIELD name="dataRelease" arraysize="1" datatype="unsignedByte" unit="dimensionless" default="NA">
    81         <DESCRIPTION>Data release</DESCRIPTION>
     87        <DESCRIPTION>Data release version.</DESCRIPTION>
    8288      </FIELD>
    8389      <DATA>
    … …  
    8692    </TABLE>
    8793    <TABLE name="DiffDetection">
    88       <DESCRIPTION>VOTable description of PSPS table DiffDetection</DESCRIPTION>
     94      <DESCRIPTION>Contains the photometry of individual detections from the difference image.  The identifiers connecting the detection back to the difference image and to the object association are provided.  PSF, aperture, and Kron (1980) photometry are included, along with sky and detector coordinate positions.  Statistics  References: Kron, R. G. 1980, ApJS, 43, 305.</DESCRIPTION>
    8995      <PARAM arraysize="1" datatype="char" ucd="meta.bib.author" name="Author" value="PSPS"></PARAM>
    9096      <FIELD name="diffObjID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    91         <DESCRIPTION>ODM diff object identifier</DESCRIPTION>
     97        <DESCRIPTION>Unique difference object identifier.</DESCRIPTION>
    9298      </FIELD>
    9399      <FIELD name="uniquePspsDFid" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    94         <DESCRIPTION>unique psps diff detection id, based on batch + row number</DESCRIPTION>
     100        <DESCRIPTION>Unique internal PSPS difference detection identifier.</DESCRIPTION>
    95101      </FIELD>
    96102      <FIELD name="diffDetID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    97         <DESCRIPTION>ODM diff detection identifier</DESCRIPTION>
     103        <DESCRIPTION>Unique difference detection identifier.</DESCRIPTION>
    98104      </FIELD>
    99105      <FIELD name="diffDetMetaID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    100         <DESCRIPTION>diff detection meta identifer</DESCRIPTION>
     106        <DESCRIPTION>Difference detection meta identifier.</DESCRIPTION>
     107      </FIELD>
     108      <FIELD name="ippObjID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
     109        <DESCRIPTION>IPP internal object identifier.</DESCRIPTION>
    101110      </FIELD>
    102111      <FIELD name="ippDetectID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    103         <DESCRIPTION>detection id generated by IPP</DESCRIPTION>
    104       </FIELD>
    105       <FIELD name="ippObjID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    106         <DESCRIPTION>object id generated by IPP</DESCRIPTION>
     112        <DESCRIPTION>IPP internal detection identifier.</DESCRIPTION>
    107113      </FIELD>
    108114      <FIELD name="filterID" arraysize="1" datatype="unsignedByte" unit="dimensionless" default="NA">
    109         <DESCRIPTION>filter ID: g=1, r=2, i=3, z=4, y=5, w=6, ...</DESCRIPTION>
     115        <DESCRIPTION>Filter identifier.  Details in the Filter table.</DESCRIPTION>
    110116      </FIELD>
    111117      <FIELD name="surveyID" arraysize="1" datatype="unsignedByte" unit="dimensionless" default="NA">
    112         <DESCRIPTION>survey flag identifier</DESCRIPTION>
     118        <DESCRIPTION>Survey identifier.  Details in the Survey table.</DESCRIPTION>
    113119      </FIELD>
    114120      <FIELD name="randomDiffID" arraysize="1" datatype="double" unit="dimensionless" default="NA">
    115         <DESCRIPTION> random diff id</DESCRIPTION>
     121        <DESCRIPTION>Random value drawn from the interval between zero and one.</DESCRIPTION>
     122      </FIELD>
     123      <FIELD name="projectionID" arraysize="1" datatype="short" unit="dimensionless" default="-1">
     124        <DESCRIPTION>Projection cell identifier.</DESCRIPTION>
    116125      </FIELD>
    117126      <FIELD name="skyCellID" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    118         <DESCRIPTION>single float givijng PrimaryCell.SkyCell identifier</DESCRIPTION>
     127        <DESCRIPTION>Skycell region identifier.</DESCRIPTION>
    119128      </FIELD>
    120129      <FIELD name="dvoRegionID" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    121         <DESCRIPTION> identifier to dvo spacial region</DESCRIPTION>
    122       </FIELD>
    123       <FIELD name="obsTime" arraysize="1" datatype="double" unit="MeanJulianDays" default="-999">
    124         <DESCRIPTION> Time of mid observation of positive detection in Mean Julian Days</DESCRIPTION>
    125       </FIELD>
    126       <FIELD name="xPos" arraysize="1" datatype="float" unit="pixels" default="-999">
    127         <DESCRIPTION> measured x on CCD from PSF fit</DESCRIPTION>
    128       </FIELD>
    129       <FIELD name="yPos" arraysize="1" datatype="float" unit="pixels" default="-999">
    130         <DESCRIPTION> measured y on CCD from PSF fit</DESCRIPTION>
    131       </FIELD>
    132       <FIELD name="xPosErr" arraysize="1" datatype="float" unit="pixels" default="-999">
    133         <DESCRIPTION> estimated error in x</DESCRIPTION>
    134       </FIELD>
    135       <FIELD name="yPosErr" arraysize="1" datatype="float" unit="pixels" default="-999">
    136         <DESCRIPTION> estimated error in y</DESCRIPTION>
    137       </FIELD>
    138       <FIELD name="pltScale" arraysize="1" datatype="float" unit="arcsec/pix" default="-999">
    139         <DESCRIPTION>plate scale at this location (from DVO)</DESCRIPTION>
     130        <DESCRIPTION>Internal DVO region identifier.</DESCRIPTION>
     131      </FIELD>
     132      <FIELD name="obsTime" arraysize="1" datatype="double" unit="days" default="-999">
     133        <DESCRIPTION>Modified Julian Date at the midpoint of the observation.</DESCRIPTION>
     134      </FIELD>
     135      <FIELD name="xPos" arraysize="1" datatype="float" unit="sky pixels" default="-999">
     136        <DESCRIPTION>PSF x center location.</DESCRIPTION>
     137      </FIELD>
     138      <FIELD name="yPos" arraysize="1" datatype="float" unit="sky pixels" default="-999">
     139        <DESCRIPTION>PSF y center location.</DESCRIPTION>
     140      </FIELD>
     141      <FIELD name="xPosErr" arraysize="1" datatype="float" unit="sky pixels" default="-999">
     142        <DESCRIPTION>Error in PSF x center location.</DESCRIPTION>
     143      </FIELD>
     144      <FIELD name="yPosErr" arraysize="1" datatype="float" unit="sky pixels" default="-999">
     145        <DESCRIPTION>Error in PSF y center location.</DESCRIPTION>
     146      </FIELD>
     147      <FIELD name="pltScale" arraysize="1" datatype="float" unit="arcsec/pixel" default="-999">
     148        <DESCRIPTION>Local plate scale at this location.</DESCRIPTION>
    140149      </FIELD>
    141150      <FIELD name="posAngle" arraysize="1" datatype="float" unit="degrees" default="-999">
    142         <DESCRIPTION>position angle (sky-to-chip) at this location (from DVO)</DESCRIPTION>
     151        <DESCRIPTION>Position angle (sky-to-chip) at this location.</DESCRIPTION>
    143152      </FIELD>
    144153      <FIELD name="ra" arraysize="1" datatype="double" unit="degrees" default="NA">
    145         <DESCRIPTION>right ascension</DESCRIPTION>
     154        <DESCRIPTION>Right ascension.</DESCRIPTION>
    146155      </FIELD>
    147156      <FIELD name="dec" arraysize="1" datatype="double" unit="degrees" default="NA">
    148         <DESCRIPTION>declination</DESCRIPTION>
     157        <DESCRIPTION>Declination.</DESCRIPTION>
    149158      </FIELD>
    150159      <FIELD name="raErr" arraysize="1" datatype="float" unit="arcsec" default="NA">
    151         <DESCRIPTION>right ascension error</DESCRIPTION>
     160        <DESCRIPTION>Right ascension error.</DESCRIPTION>
    152161      </FIELD>
    153162      <FIELD name="decErr" arraysize="1" datatype="float" unit="arcsec" default="NA">
    154         <DESCRIPTION>declination error</DESCRIPTION>
    155       </FIELD>
    156       <FIELD name="zp" arraysize="1" datatype="float" unit="magnitude" default="0">
    157         <DESCRIPTION>zeropoint</DESCRIPTION>
    158       </FIELD>
    159       <FIELD name="telluricExt" arraysize="1" datatype="float" unit="magnitude" default="NA">
    160         <DESCRIPTION>estimated extinction due to non-photometric conditions</DESCRIPTION>
     163        <DESCRIPTION>Declination error.</DESCRIPTION>
     164      </FIELD>
     165      <FIELD name="zp" arraysize="1" datatype="float" unit="magnitudes" default="0">
     166        <DESCRIPTION>Photometric zeropoint.</DESCRIPTION>
     167      </FIELD>
     168      <FIELD name="telluricExt" arraysize="1" datatype="float" unit="magnitudes" default="NA">
     169        <DESCRIPTION>Estimated Telluric extinction due to non-photometric observing conditions.</DESCRIPTION>
    161170      </FIELD>
    162171      <FIELD name="expTime" arraysize="1" datatype="float" unit="seconds" default="-999">
    163         <DESCRIPTION>exposure time (informational)</DESCRIPTION>
     172        <DESCRIPTION>Exposure time of the positive single-epoch image.</DESCRIPTION>
    164173      </FIELD>
    165174      <FIELD name="airMass" arraysize="1" datatype="float" unit="dimensionless" default="0">
    166         <DESCRIPTION>airmass (informational)</DESCRIPTION>
     175        <DESCRIPTION>Airmass at midpoint of the exposure.</DESCRIPTION>
    167176      </FIELD>
    168177      <FIELD name="DpsfFlux" arraysize="1" datatype="float" unit="adu/seconds" default="-999">
    169         <DESCRIPTION> PSF instrumental flux (in analog-to-digital units/sec) or adu/sec</DESCRIPTION>
     178        <DESCRIPTION>PSF instrumental flux.</DESCRIPTION>
    170179      </FIELD>
    171180      <FIELD name="DpsfFluxErr" arraysize="1" datatype="float" unit="adu/seconds" default="-999">
    172         <DESCRIPTION> estimated error in flux</DESCRIPTION>
     181        <DESCRIPTION>Error in PSF flux.</DESCRIPTION>
    173182      </FIELD>
    174183      <FIELD name="DpsfMajorFWHM" arraysize="1" datatype="float" unit="arcsec" default="-999">
    175         <DESCRIPTION> model PSF width in major axis</DESCRIPTION>
     184        <DESCRIPTION>PSF major axis FWHM.</DESCRIPTION>
    176185      </FIELD>
    177186      <FIELD name="DpsfMinorFWHM" arraysize="1" datatype="float" unit="arcsec" default="-999">
    178         <DESCRIPTION> model PSF width in minor axis</DESCRIPTION>
     187        <DESCRIPTION>PSF minor axis FWHM.</DESCRIPTION>
    179188      </FIELD>
    180189      <FIELD name="DpsfTheta" arraysize="1" datatype="float" unit="degrees" default="-999">
    181         <DESCRIPTION> model PSF orientation angle degrees East of North</DESCRIPTION>
     190        <DESCRIPTION>PSF major axis orientation.</DESCRIPTION>
    182191      </FIELD>
    183192      <FIELD name="DpsfCore" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    184         <DESCRIPTION>model PSF core parameter [k in (1 + kz + z^1.66)]</DESCRIPTION>
     193        <DESCRIPTION>PSF core parameter k, where F = F0 / (1 + k r^2 + r^3.33).</DESCRIPTION>
    185194      </FIELD>
    186195      <FIELD name="DpsfQf" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    187         <DESCRIPTION>PSF coverage factor</DESCRIPTION>
     196        <DESCRIPTION>PSF coverage factor.</DESCRIPTION>
    188197      </FIELD>
    189198      <FIELD name="DpsfQfPerfect" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    190         <DESCRIPTION>PSF-weighted fraction of pixels totally unmasked</DESCRIPTION>
     199        <DESCRIPTION>PSF-weighted fraction of pixels totally unmasked.</DESCRIPTION>
    191200      </FIELD>
    192201      <FIELD name="DpsfChiSq" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    193         <DESCRIPTION>reduced-chisq of the psf model fit. (ndof?, npix?)</DESCRIPTION>
     202        <DESCRIPTION>Reduced chi squared value of the PSF model fit.</DESCRIPTION>
    194203      </FIELD>
    195204      <FIELD name="DpsfLikelihood" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    196         <DESCRIPTION>PSF likelihood</DESCRIPTION>
    197       </FIELD>
    198       <FIELD name="DmomentXX" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    199         <DESCRIPTION> moment XX</DESCRIPTION>
    200       </FIELD>
    201       <FIELD name="DmomentXY" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    202         <DESCRIPTION> moment XY</DESCRIPTION>
    203       </FIELD>
    204       <FIELD name="DmomentYY" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    205         <DESCRIPTION> moment YY</DESCRIPTION>
    206       </FIELD>
    207       <FIELD name="DmomentR1" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    208         <DESCRIPTION> first radial moment</DESCRIPTION>
    209       </FIELD>
    210       <FIELD name="DmomentRH" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    211         <DESCRIPTION> r^1/2 weighted moment</DESCRIPTION>
    212       </FIELD>
    213       <FIELD name="DmomentM3C" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    214         <DESCRIPTION> 3rd moment cos(theta)</DESCRIPTION>
    215       </FIELD>
    216       <FIELD name="DmomentM3S" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    217         <DESCRIPTION> 3rd moment sin(theta)</DESCRIPTION>
    218       </FIELD>
    219       <FIELD name="DmomentM4C" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    220         <DESCRIPTION> 4th moment cos(theta)</DESCRIPTION>
    221       </FIELD>
    222       <FIELD name="DmomentM4S" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    223         <DESCRIPTION> 4th moment sin(theta)</DESCRIPTION>
     205        <DESCRIPTION>Likelihood that this detection is best fit by a PSF.</DESCRIPTION>
     206      </FIELD>
     207      <FIELD name="DmomentXX" arraysize="1" datatype="float" unit="sky pixels^2" default="-999">
     208        <DESCRIPTION>Second moment M_xx.</DESCRIPTION>
     209      </FIELD>
     210      <FIELD name="DmomentXY" arraysize="1" datatype="float" unit="sky pixels^2" default="-999">
     211        <DESCRIPTION>Second moment M_xy.</DESCRIPTION>
     212      </FIELD>
     213      <FIELD name="DmomentYY" arraysize="1" datatype="float" unit="sky pixels^2" default="-999">
     214        <DESCRIPTION>Second moment M_yy.</DESCRIPTION>
     215      </FIELD>
     216      <FIELD name="DmomentR1" arraysize="1" datatype="float" unit="sky pixels" default="-999">
     217        <DESCRIPTION>First radial moment.</DESCRIPTION>
     218      </FIELD>
     219      <FIELD name="DmomentRH" arraysize="1" datatype="float" unit="sky pixels^0.5" default="-999">
     220        <DESCRIPTION>Half radial moment (r^0.5 weighting).</DESCRIPTION>
     221      </FIELD>
     222      <FIELD name="DmomentM3C" arraysize="1" datatype="float" unit="sky pixels^3" default="-999">
     223        <DESCRIPTION>Moment M3C = M_xxx - 3 * M_xyy.</DESCRIPTION>
     224      </FIELD>
     225      <FIELD name="DmomentM3S" arraysize="1" datatype="float" unit="sky pixels^3" default="-999">
     226        <DESCRIPTION>Moment M3S = 3 * M_xxy - M_yyy.</DESCRIPTION>
     227      </FIELD>
     228      <FIELD name="DmomentM4C" arraysize="1" datatype="float" unit="sky pixels^4" default="-999">
     229        <DESCRIPTION>Moment M4C = M_xxxx - 6 * M_xxyy + M_yyyy.</DESCRIPTION>
     230      </FIELD>
     231      <FIELD name="DmomentM4S" arraysize="1" datatype="float" unit="sky pixels^4" default="-999">
     232        <DESCRIPTION>Moment M4S = 4 * M_xxxy - 4 * M_xyyy.</DESCRIPTION>
    224233      </FIELD>
    225234      <FIELD name="DapFlux" arraysize="1" datatype="float" unit="adu/seconds" default="-999">
    226         <DESCRIPTION> Aperture Flux</DESCRIPTION>
     235        <DESCRIPTION>Aperture instrumental flux.</DESCRIPTION>
    227236      </FIELD>
    228237      <FIELD name="DapFluxErr" arraysize="1" datatype="float" unit="adu/seconds" default="-999">
    229         <DESCRIPTION> Aperture Flux error</DESCRIPTION>
     238        <DESCRIPTION>Error in aperture flux.</DESCRIPTION>
    230239      </FIELD>
    231240      <FIELD name="DapFillF" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    232         <DESCRIPTION> Aperture fill factor</DESCRIPTION>
     241        <DESCRIPTION>Aperture fill factor.</DESCRIPTION>
    233242      </FIELD>
    234243      <FIELD name="DkronFlux" arraysize="1" datatype="float" unit="adu/seconds" default="-999">
    235         <DESCRIPTION> Kron flux</DESCRIPTION>
     244        <DESCRIPTION>Kron (1980) instrumental flux.</DESCRIPTION>
    236245      </FIELD>
    237246      <FIELD name="DkronFluxErr" arraysize="1" datatype="float" unit="adu/seconds" default="-999">
    238         <DESCRIPTION> Kron flux error</DESCRIPTION>
    239       </FIELD>
    240       <FIELD name="DkronRad" arraysize="1" datatype="float" unit="raw pixels" default="-999">
    241         <DESCRIPTION> Kron radius</DESCRIPTION>
    242       </FIELD>
    243       <FIELD name="diffNPos" arraysize="1" datatype="int" unit="dimensionless" default="-999">
    244         <DESCRIPTION>NPix > 3sigma</DESCRIPTION>
     247        <DESCRIPTION>Error in Kron (1980) instrumental flux.</DESCRIPTION>
     248      </FIELD>
     249      <FIELD name="DkronRad" arraysize="1" datatype="float" unit="sky pixels" default="-999">
     250        <DESCRIPTION>Kron (1980) radius.</DESCRIPTION>
     251      </FIELD>
     252      <FIELD name="diffNPos" arraysize="1" datatype="int" unit="sky pixels" default="-999">
     253        <DESCRIPTION>Number of difference pixels within the aperture that are positive.</DESCRIPTION>
    245254      </FIELD>
    246255      <FIELD name="diffFRatio" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    247         <DESCRIPTION>fPos/(fPos + fNeg)</DESCRIPTION>
     256        <DESCRIPTION>Fraction of unmasked flux within the aperture that is positive.</DESCRIPTION>
    248257      </FIELD>
    249258      <FIELD name="diffNBad" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    250         <DESCRIPTION>nPos/(nPos + nNeg)</DESCRIPTION>
     259        <DESCRIPTION>Fraction of unmasked difference pixels within the aperture that are positive.</DESCRIPTION>
    251260      </FIELD>
    252261      <FIELD name="diffNMask" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    253         <DESCRIPTION>nPos/(nPos + nMask)</DESCRIPTION>
     262        <DESCRIPTION>Fraction difference pixels within the aperture that are positive asdfasdfasdfsdfs.</DESCRIPTION>
    254263      </FIELD>
    255264      <FIELD name="diffNAll" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    256         <DESCRIPTION>nPos/(nPos + nMask + nNeg)</DESCRIPTION>
    257       </FIELD>
    258       <FIELD name="diffPdist" arraysize="1" datatype="float" unit="pixels" default="-999">
    259         <DESCRIPTION>distance to positive match source</DESCRIPTION>
    260       </FIELD>
    261       <FIELD name="diffNdist" arraysize="1" datatype="float" unit="pixels" default="-999">
    262         <DESCRIPTION>distance to negative match source</DESCRIPTION>
     265        <DESCRIPTION>Fraction of all difference pixels within the aperture that are positive.</DESCRIPTION>
     266      </FIELD>
     267      <FIELD name="diffPdist" arraysize="1" datatype="float" unit="sky pixels" default="-999">
     268        <DESCRIPTION>Distance to matching positive source.</DESCRIPTION>
     269      </FIELD>
     270      <FIELD name="diffNdist" arraysize="1" datatype="float" unit="sky pixels" default="-999">
     271        <DESCRIPTION>Distance to matching negative source.</DESCRIPTION>
    263272      </FIELD>
    264273      <FIELD name="diffPSN" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    265         <DESCRIPTION>signal to noise of pos match source</DESCRIPTION>
     274        <DESCRIPTION>Signal to noise of matching positive source.</DESCRIPTION>
    266275      </FIELD>
    267276      <FIELD name="diffNSN" arraysize="1" datatype="float" unit="dimensionless" default="-999">
    268         <DESCRIPTION>signal to noise of neg match source</DESCRIPTION>
    269       </FIELD>
    270       <FIELD name="Dsky" arraysize="1" datatype="float" unit="adu/sec/pixel" default="-999">
    271         <DESCRIPTION> PSF sky level at source</DESCRIPTION>
    272       </FIELD>
    273       <FIELD name="DskyErr" arraysize="1" datatype="float" unit="adu/sec/pixel" default="-999">
    274         <DESCRIPTION> estimated error in sky</DESCRIPTION>
     277        <DESCRIPTION>Signal to noise of matching negative source.</DESCRIPTION>
     278      </FIELD>
     279      <FIELD name="Dsky" arraysize="1" datatype="float" unit="adu/seconds/pixel" default="-999">
     280        <DESCRIPTION>Background sky level.</DESCRIPTION>
     281      </FIELD>
     282      <FIELD name="DskyErr" arraysize="1" datatype="float" unit="adu/seconds/pixel" default="-999">
     283        <DESCRIPTION>Error in background sky level.</DESCRIPTION>
    275284      </FIELD>
    276285      <FIELD name="DinfoFlag" arraysize="1" datatype="long" unit="dimensionless" default="-999">
    277         <DESCRIPTION>flag indicating provenance information</DESCRIPTION>
     286        <DESCRIPTION>Information flag bitmask indicating details of the photometry.  Values listed in DetectionFlags.</DESCRIPTION>
    278287      </FIELD>
    279288      <FIELD name="DinfoFlag2" arraysize="1" datatype="long" unit="dimensionless" default="-999">
    280         <DESCRIPTION>flag indicating provenance information</DESCRIPTION>
     289        <DESCRIPTION>Information flag bitmask indicating details of the photometry.  Values listed in DetectionFlags2.</DESCRIPTION>
    281290      </FIELD>
    282291      <FIELD name="DinfoFlag3" arraysize="1" datatype="long" unit="dimensionless" default="-999">
    283         <DESCRIPTION>flag indicating provenance information</DESCRIPTION>
     292        <DESCRIPTION>Information flag bitmask indicating details of the photometry.  Values listed in DetectionFlags3.</DESCRIPTION>
    284293      </FIELD>
    285294      <FIELD name="dataRelease" arraysize="1" datatype="unsignedByte" unit="dimensionless" default="NA">
    286         <DESCRIPTION>Data release when this detection was originally taken. Recalibrations do not affect this value.</DESCRIPTION>
     295        <DESCRIPTION>Data release version.</DESCRIPTION>
    287296      </FIELD>
    288297      <DATA>
    … …  
    291300    </TABLE>
    292301    <TABLE name="DiffToImage">
    293       <DESCRIPTION>VOTable description of PSPS table DiffToImage</DESCRIPTION>
     302      <DESCRIPTION>Contains the mapping of which input images were used to construct a particular difference image.</DESCRIPTION>
    294303      <PARAM arraysize="1" datatype="char" ucd="meta.bib.author" name="Author" value="PSPS"></PARAM>
    295304      <FIELD name="diffMetaID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    296         <DESCRIPTION>diff identifier</DESCRIPTION>
     305        <DESCRIPTION>Unique difference identifier.</DESCRIPTION>
    297306      </FIELD>
    298307      <FIELD name="imageID" arraysize="1" datatype="long" unit="dimensionless" default="NA">
    299         <DESCRIPTION>hashed exposure-ccdID identifier</DESCRIPTION>
     308        <DESCRIPTION>Unique image identifier.  Constructed as (100 * frameID + ccdID).</DESCRIPTION>
    300309      </FIELD>
    301310      <DATA>
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