| [1852] | 1 | =====================
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| 2 | Scantable Description
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| 3 | =====================
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| 4 |
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| 5 | Introduction
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| 6 | ============
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| 7 |
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| 8 | The Scantable is the ASAP single-dish data container. It was designed
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| 9 | based on the data abstraction of the PKSreader API.
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| 10 |
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| 11 | Schema
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| 12 | ======
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| 13 |
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| 14 | The Scantable consist of a main (casacore) Table and several sub-tables which
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| 15 | are referenced via _id_.
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| 16 |
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| 17 | ----------
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| 18 | Main Table
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| 19 | ----------
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| 20 |
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| 21 | The main table consists of global data (keywords) and row-based data (columns)
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| 22 |
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| 23 | Columns
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| 24 | -------
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| 25 |
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| 26 | * **SPECTRA** - *Float(nchannel)*
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| 27 |
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| 28 | the spectral channel data.
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| 29 |
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| 30 | * **FLAGTRA** - *uChar(nchannel)*
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| 31 |
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| 32 | the corresponding flags
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| 33 |
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| 34 | * **TSYS** - *Float(nchannel)*
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| 35 |
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| 36 | the channel-based system temperature values
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| 37 |
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| 38 | * **FLAGROW** - *uInt*
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| 39 |
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| 40 | spectrum based flags
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| 41 |
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| 42 | * **TIME** - *MEpoch*
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| 43 |
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| 44 | The mjd time when the observation took place
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| 45 |
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| 46 | * **INTERVAL** - *Double*
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| 47 |
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| 48 | the integration time in seconds
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| 49 |
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| 50 | * **DIRECTION** - *MDirection*
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| 51 |
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| 52 | the associated direction on the sky
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| 53 |
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| 54 | * **AZIMUTH, ELEVATION** - *Float*
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| 55 |
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| 56 | the azimuth/elevation when the spectrum was collected
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| 57 |
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| 58 | * **SRCNAME** - *string*
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| 59 |
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| 60 | the name of the source observered
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| 61 |
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| 62 | * **SRCTYPE** - *Int*
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| 63 |
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| 64 | the tyep of the source, i.e. indicating if it is an on source scan or
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| 65 | off source. This will be used for calibration
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| 66 |
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| 67 | * **SCANNO, BEAMNO, POLNO, IFNO, CYCLENO** - *uInt*
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| 68 |
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| 69 | These columns index (0-based) the respective values.
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| 70 |
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| 71 | * SCANNO: the number odf the scan. A scan is usually multiple integrations
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| 72 | (cycles)
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| 73 |
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| 74 | * CYCLENO: the integration number within a scan (sub-scan?)
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| 75 |
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| 76 | * IFNO: the index of the IF (spectral window)
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| 77 |
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| 78 | * BEAMNO: the index of the beam (in a multibeam system)
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| 79 |
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| 80 | * POLNO: the index of the polarisation, e.g. XX=0, YY=1, Real(XY)=2,
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| 81 | Imag(XY)=3
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| 82 |
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| 83 | * **REFBEAMNO** - *Int*
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| 84 |
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| 85 | optional index of the reference beam in a multibeam obervation
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| 86 |
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| 87 | * **FREQ_ID, MOLECULE_ID, TCAL_ID, FOCUS_ID, WEATHER_ID, FIT_ID**
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| 88 |
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| 89 |
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| 90 | ----------
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| 91 | Sub-Tables
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| 92 | ----------
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| 93 |
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| 94 | FREQUENCY
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| 95 | ---------
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| 96 |
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| 97 | blah blah
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| 98 |
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| 99 |
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| 100 | ========================
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| 101 | Mapping to other formats
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| 102 | ========================
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| 103 |
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| 104 | MS
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| 105 | ==
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