{"id":325,"date":"2014-11-13T16:34:52","date_gmt":"2014-11-14T02:34:52","guid":{"rendered":"http:\/\/www.eaobservatory.org\/jcmt\/?page_id=325"},"modified":"2017-01-10T16:57:01","modified_gmt":"2017-01-11T02:57:01","slug":"cadc-columns","status":"publish","type":"page","link":"https:\/\/www.eaobservatory.org\/jcmt\/science\/archive\/cadc-columns\/","title":{"rendered":"Full list of CADC columns"},"content":{"rendered":"\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Preview:<\/th>\nCurrently blank.<\/strong> On hover-over this will show you the preview
\nimage for a given observation. Clicking on it will open a new
\npage showing you a larger version of the preview images. The preview
\nimages show the maps produced by ORAC-DR for SCUBA-2 data, and
\neither an integrated map, a representative spectrum or both for the ACSIS data.<\/td>\n<\/tr>\n
Collection:<\/th>\nCurrently all JCMT data is labelled JCMT<\/em>. Eventually, we may have
\nadditional JCMT collections for Survey-produced products and PI
\nproduced products.<\/td>\n<\/tr>\n
Obs ID:<\/th>\nObservation ID. For the raw files and reduced data from one
\nobservation the format should be fairly recognisable to JCMT users:
\ninstrumentName ___ObsNum__Datestamp.
\nComposite reductions – reduced data using more than one
\nobservation – have a more complex ID, which includes a long
\nalphanumeric string and is not easily usable.<\/td>\n<\/tr>\n
RA(J2000):<\/th>\nApproximate RA of map centre. Can be shown in decimal
\ndegrees or ‘H:M:S’ by selecting the drop down option.<\/td>\n<\/tr>\n
Dec(J2000):<\/th>\nApproximate Dec of map centre. Can be shown in decimal
\ndegrees or ‘D:M:S’ by selecting the drop down option.<\/td>\n<\/tr>\n
Start Date:<\/th>\nUT time of start of observation, in MJD or Calendar format (Calendar by default).<\/td>\n<\/tr>\n
Instrument:<\/th>\nJCMT instrument name. Continuum instrumentation naming
\nshould be obvious. For heterodyne instrumentation, we’ve chosen to
\nuse FRONTEND-BACKEND as a naming scheme, or
\nPOLARIMETER-FRONTEND-BACKEND for polarimetry observations. However,
\nnot all data has been re-ingested following this change, so you
\nwill currently find some HARP data labelled as HARP-ACSIS and
\nsome as ACSIS. Some older (pre-ACSIS and pre-SCUBA-2) observations are also present in the
\ndatabase, but they are not very discoverable through this interface. Large amounts of
\ninformation has not yet been migrated to this database for these older observations, and the older instrument names may not be in a
\nstandardised form.<\/td>\n<\/tr>\n
Int. Time:<\/th>\nIntegration time, by default in seconds. This is the integration
\ntime of the whole map.<\/td>\n<\/tr>\n
Target Name:<\/th>\nThe target name as it was set in the JCMT Observing Tool by the project
\nwho carried out the observation. This is usually useful and recognisable, but
\nparticularly in projects that observe multiple scans nearby each
\nother you may see names such as ‘Region 1’ or ‘Box N’; this is of
\nless use to other astronomers. The target name can be searched directly from the
\nsearch pane by unsetting the ‘Resolve object name to coordinates’ tick box in
\nthe spatial constraints->Target section of the search pane.<\/td>\n<\/tr>\n
Filter:<\/th>\nFor continuum observations,
\nthis indicates the wavelength. The SCUBA-2 filters are named
\n450um-SCUBA-2 and 850um-SCUBA-2, to indicate they are not exactly the
\nsame filter profile as was used by SCUBA (currently at least, SCUBA
\nfilters are named only by the wavelength). This column is not set for spectral observations.
\nIt can be used as a constraint on the search page as well as used
\nto filter results shown in the results table.<\/td>\n<\/tr>\n
Cal level:<\/th>\n\n
    \n
  • 0<\/strong> Raw instrumental data.<\/li>\n
  • 1<\/strong> Unreduced observations that have been converted to position-position-velocity cube. (Spectral data only.)<\/li>\n
  • 2<\/strong> Reduced data.<\/li>\n
  • (3<\/strong> This can represent a higher level of reduced data. It is not currently used by the
    \nJCMT, but may be in the future to indicate advanced multi-project reductions.)<\/li>\n<\/ul>\n

    The calibration level be used as a constraint on the search page
    \n(under additional constraints) as well as used to filter the rows
    \nshown in the results pane.<\/p>\n<\/td>\n<\/tr>\n

Obs Type:<\/th>\nThe type of observation — e.g. grid\/jiggle\/scan for HARP science
\nobservations, or scan\/setup\/noise etc. for SCUBA-2 observations.
\nCan be pre filtered on the query page as well as here — you can
\nview the full list of options for a given instrument in the search pane.<\/td>\n<\/tr>\n
Min Wavelength:<\/th>\nMinimum wavelength or frequency<\/em> of observation. A drop down menu at the top of the column allows you to use various standard frequency and wavelength units.<\/td>\n<\/tr>\n
Max Wavelength:<\/th>\nMaximum wavelength or frequency<\/em> of observation. A drop down menu at the top of the column allows you to use various standard frequency and wavelength units.<\/td>\n<\/tr>\n
Proposal ID:<\/th>\nThe JCMT proposal ID of the project. Can be preselected on query page, and that page will also autocomplete from the possible options for you.<\/td>\n<\/tr>\n
PI Name:<\/th>\nThe name of the PI the observation was taken under. This can be
\npreselected in query page which will also autocomplete for you from
\nthe possible options.<\/td>\n<\/tr>\n
Product ID:<\/th>\nThis tells you the type of file. E.g. SCUBA-2 data could be raw_450
\nor reduced_850 . ACSIS data is in form raw_X, cube_X and reduced_X,
\nwhere X is the frequency and bandwidth mode, and raw, cube and reduced
\ncorrespond to the Cal levels 0, 1 and 2.<\/td>\n<\/tr>\n
Data Release:<\/th>\nDate this raw observation or reduced file was or will be made
\npublic. Data that are not yet public are only viewable if your CADC
\nID is associated with your JCMT OMP ID and attached to the project
\nin question. This appears to be set correctly but display with the wrong month (always January instead of February or August).<\/td>\n<\/tr>\n
Field of View:<\/th>\nThe area of the map, in square degrees (default), arcminutes or
\narcseconds.<\/td>\n<\/tr>\n
Pixel Scale:<\/th>\nSpatial size of pixels, in arcseconds by default but convertible to
\nother angular units. Not set for raw SCUBA-2 data or raw ACSIS data.<\/td>\n<\/tr>\n
Data Type:<\/th>\nThis indicates if the line in the results table represents a cube, image or spectra. This
\nis not set for raw data (i.e., calibration level 0 or a Product ID that begins with raw_).<\/td>\n<\/tr>\n
Time dependent:<\/th>\nThis should be 0 or 1 to indicate if data is time dependent or
\nnot. This is currently broken and is never visibly set at CADC.<\/td>\n<\/tr>\n
Intent:<\/th>\nSet to Science or Calibration. Can be set on query page as
\nwell as filtered here. Note that observations of a calibration source taken as part of a
\nscience msb are labelled science, and SCUBA-2 pointings are always
\nlabelled science.<\/td>\n<\/tr>\n
Target Type:<\/th>\nThis column is not set for JCMT data. For some telescopes a string
\nwill be set here similar to the Simbad object type, indicating if
\nit is a star, part of a cloud, a galaxy etc.<\/td>\n<\/tr>\n
Target Standard:<\/th>\nObservations of telescope standards are
\nflagged with a 1 here (whether science or calibration), otherwise
\nwe set a 0.<\/td>\n<\/tr>\n
Sequence Number:<\/th>\nThe observation or scan number of the original
\nobservation (as listed in the OMP or the JCMT observation log for
\nthe night). Not set for composite reductions of multiple
\nobservations.<\/td>\n<\/tr>\n
Algorithm Name:<\/th>\nIndicates the grouping algorithm used to determine
\nwhich observations were included in this object,
\nwhether single or composite. Possible values are
\nexposure<\/em> for any object consisting of one
\nobservation, night<\/em> for a night reduction, project<\/em>
\nfor project reductions (where they exist) and
\neventually public<\/em> for the tiled JCMT Science
\nArchive generic reductions.<\/td>\n<\/tr>\n
Proposal Title:<\/th>\nThe title from the original observing proposal. These can be very long.<\/td>\n<\/tr>\n
Proposal Keywords:<\/th>\nNot set by the JCMT for any observations\/composites.<\/td>\n<\/tr>\n
Band:<\/th>\nThe waveband — should be millimetre for all of JCMT
\ndata. Currently, some older observations have the wrong wavelength bounds set
\nwhich results in it having a wrong or unknown band.<\/td>\n<\/tr>\n
Prov. Version:<\/th>\nThis long alphanumeric
\nstring tells you which version of reduction software produced this
\nobject. For JCMT observations, this is the git commit ID for the
\nversion of starlink software used to perform the reduction (see https:\/\/github.com\/Starlink\/starlink<\/a>)<\/td>\n<\/tr>\n
Prov. Name:<\/th>\nFor reduced data it is the name of the ORAC-DR<\/a> recipe used for the reduction. This is not set for raw data.<\/td>\n<\/tr>\n
Prov. Project:<\/th>\nIndicates what carried out the data reduction
\nprocess. At the moment this should be set to the
\nJCMT_STANDARD_PIPELINE<\/em> for all our data. Eventually
\nwe may have other options, for e.g. PI produced data
\nproducts.<\/td>\n<\/tr>\n
Prov. Run ID:<\/th>\nNot generally useful for users, this is a hash indicating the
\nspecific run of the software which produced this object.<\/td>\n<\/tr>\n
Prov. Last Executed:<\/th>\nDay the processing for this object was carried out.<\/td>\n<\/tr>\n
Rest frame spectral coverage:<\/th>\nThe rest-frame wavelength\/frequency of the observation. A drop
\ndown menu lets you select from various wavelength or frequency
\nunits.<\/td>\n<\/tr>\n
DOWNLOADABLE:<\/th>\nThe CADC URI for the downloadable file. This is an unique resource
\nindicator (URI) used by CADC to denote the location of a file available
\nto download. This is not not a clickable link, nor is it a web
\nURL.<\/td>\n<\/tr>\n
CAOM Plane Uri:<\/th>\nThis is exactly the same as the DOWNLOADABLE column.<\/td>\n<\/tr>\n
Molecule:<\/th>\nFor spectral observations, this is the observed molecule. This is not set for all data, as observers may have manually specified a frequency.<\/td>\n<\/tr>\n
Transition:<\/th>\nFor spectral observations, this is the observed transition. This is not set for all data, as observers may have manually specified a frequency.<\/td>\n<\/tr>\n
IQ:<\/th>\nMedian spatial resolution, i.e. the FWHM of the beam. This is not currently set for JCMT results.<\/td>\n<\/tr>\n
Quality:<\/th>\n This is blank if the observation is labelled as GOOD within the JCMT’s OMP system,\u00a0\u00a0or will say Fail\u00a0if the observation was marked as either BAD or QUESTIONABLE in the OMP. Observations marked as JUNK in the OMP\u00a0 are not shown through the Advanced Search interface.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

Preview: Currently blank. On hover-over this will show you the preview image for a given observation. Clicking on it will open a new page showing you a larger version of the preview images. The preview images show the maps produced by ORAC-DR for SCUBA-2 data, and either an integrated map,\u2026 Continue reading<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"parent":89,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"_links":{"self":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages\/325"}],"collection":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/comments?post=325"}],"version-history":[{"count":5,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages\/325\/revisions"}],"predecessor-version":[{"id":6238,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages\/325\/revisions\/6238"}],"up":[{"embeddable":true,"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/pages\/89"}],"wp:attachment":[{"href":"https:\/\/www.eaobservatory.org\/jcmt\/wp-json\/wp\/v2\/media?parent=325"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}