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| Column Name | Units | VO Equivalent | Source | Comments |
|---|---|---|---|---|
| sourcename | target_name | OBJECT Keyword | ||
| ra (center_position) | deg | s_ra | Center of Ra Axis | |
| dec (center_position) | deg | s_dec | Center of Dec Axis | |
| 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 | Average of CDELTn of the spatial Axes, converted from deg | |
| starttime | MJD | t_maxmin | Temporal domain information for an image is dependent upon the observation(s) used in its generation. Some controlling process (Like Vlass Manager, whatever imaging pipeline we create, and any image manipulation software we use) will need to supply it. | |
| endtime | MJD | t_minmax | ||
| exposure_time | s | t_exptime | ||
| min_frequency observing_band) | Hz | em_min | Minimum of Spectral Axis | The spectral information is recoverable from the FITS header, and will identify the spectral coverage, and total bandwidth processed for the image. (TBD: what further information for unit conversion for the VO? (Hz → m)) |
| max_frequency (observing_band) | Hz | em_max | Maximum of Spectral Axis | |
| spectral_resolution | unitless | em_res_power | Center Frequency/CDELTn | |
polarization_id (reverting to initial name) | 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]. When we begin dealing with single-polarization images, this will need to be expanded. | |
| 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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