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| Column Name | Units | VO Equivalent | Source | Comments | |
|---|---|---|---|---|---|
| sourcename | target_name | OBJECT Keyword | |||
| ra | deg | s_ra | Center of Ra Axis | ||
| dec | deg | s_dec | Center of Dec Axis | ||
| image_field_of_view | deg | s_fov | Average of NAXISn*CRDELn of the spatial Axes | ||
| spatial_region | s_region | Derived from spatial Data | STC-S String Defined in the TAP (Dowler, et al 2010) | ||
| ra_element_count | s_xel1 | Relevent NAXISn Keyword | |||
| dec_element_count | s_xel2 | Relevent NAXISn Keyword | |||
| spatial_resolution | arcsec | s_resolution | sqrt(BMAJ*BMIN) | Geometric mean of the synthesized beam axes. | |
| beam_axis_ratio | BMAJ/BMIN | Ratio of the synthesized beam axes. | |||
| starttime | MJD | t_min | Temporal domain information for an image is dependent upon the observation(s) used in its generation, and the details of the processing. Without an outside source of information, these values will be 'null' | ||
| endtime | MJD | t_max | |||
| exposure_time | s | t_exptime | |||
| min_frequency | Hz | em_min | Minimum of Spectral Axis | ||
| max_frequency | Hz | em_max | Maximum of Spectral Axis | ||
| rest_frequency | Hz | RESTFRQ Keyword | Used for transformations | ||
| band_code | From frequency range | Include all receivers used for the imageRequires outside information source for accuracy. | |||
polarization_id | pol_states | Polarization CRVALn value | CASA uses the CRVALn value to convey polarization information, with [1,2,3,4] mapped to [I,Q,U,V]. Default to 'None' in case of other values. | ||
| telescope | instrument_name | TELESCOP Keyword | This must accommodate images for multiple instruments (i.e. VLA + Single Dish) | ||
| file_id | automatically generated | link to information about the physical file | |||
| image_id | obs_id | automatically generated | Unique Identifier for the Image | ||
| image_units | o_ucd | BTYPE & BUNIT Keywords | Description of the physical quantity measured in the image | ||
| max_intensity | image_units | These values are can be determined from the data portion of the image file in conjunction with the BSCALE & BZERO keywords. The library which is used for FITS interaction for ingestion can perform these calculations, but no information about the speed of results is yet available. | |||
| min_intensity | image_units | ||||
| rms_noise | image_units | ||||
| thumbnail | weblog, a PNG with identical name |
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