Table information for 'ivoa.emptyobscore'

General

Table Description: An empty table having all columns of the obscore table. Useful internally, and sometimes for tricky queries.

This table is not available for ADQL queries and through the TAP endpoint.

Resource Description: Definition and support code for the ObsCore data model and table.

For a list of all services and tables belonging to this table's resource, see Information on resource '__system__/obscore'

Citing this table

To cite the table as such, we suggest the following BibTeX entry:

@MISC{vo:ivoa_emptyobscor,
  year=2011,
  title={Untitled Resource},
  author={{PADC}},
  url={http://vogate.obs-nancay.fr/tableinfo/ivoa.emptyobscore},
  howpublished={{VO} resource provided by the {CDN} VO Server}
}

Columns

Sorted alphabetically. [Sort by DB column index]

NameTable Head DescriptionUnitUCD
access_estsize Size Estimated size of data product kbyte phys.size;meta.file
access_format Media Type MIME type of the resource at access_url N/A meta.code.mime
access_url Access URL The URL at which to obtain the data set. N/A meta.ref.url
calib_level Calibration level Amount of data processing that has been applied to the data [Note calib] N/A meta.code;obs.calib
dataproduct_subtype Subtype Data product specific type N/A meta.code.class
dataproduct_type Product type High level scientific classification of the data product, taken from an enumeration N/A meta.code.class
em_max λ_max Maximal wavelength represented within the data set m em.wl;stat.max
em_min λ_min Minimal wavelength represented within the data set m em.wl;stat.min
em_res_power λ/Δλ Spectral resolving power lambda/delta lambda N/A spect.resolution
em_ucd Spect. UCD Nature of the product's spectral axis (typically, em.freq, em.wl, or em.energy) N/A meta.ucd
em_xel |λ| Number of elements (typically pixels) along the spectral axis. N/A meta.number
facility_name Facility Name of the facility at which data was taken N/A meta.id;instr.tel
instrument_name Instrument Name of the instrument that produced the data N/A meta.id;instr
o_ucd Obs. UCD UCD for the product's observable N/A meta.ucd
obs_collection Collection Name of a data collection (e.g., project name) this data belongs to N/A meta.id
obs_creator_did Creator DID Dataset identifier assigned by the creator. N/A meta.id
obs_id Obs. Id Unique identifier for an observation N/A meta.id
obs_publisher_did Pub. DID Dataset identifier assigned by the publisher. N/A meta.ref.ivoid
obs_title Title Free-from title of the data set N/A meta.title;obs
pol_states Pol. States List of polarization states in the data set N/A meta.code;phys.polarization
pol_xel |Pol| Number of elements (typically pixels) along the polarization axis. N/A meta.number
preview Preview URL of a preview (low-resolution, quick-to-retrieve representation) of the data. N/A meta.ref.url;meta.preview
s_dec Dec Dec of (center of) observation, ICRS deg pos.eq.dec
s_fov FoV Approximate spatial extent for the region covered by the observation deg phys.angSize;instr.fov
s_pixel_scale Pix. Scale Sampling period in world coordinate units along the spatial axis arcsec phys.angSize;instr.pixel
s_ra RA RA of (center of) observation, ICRS deg pos.eq.ra
s_region coverage Region covered by the observation, as a polygon N/A pos.outline;obs.field
s_resolution Space Res. Best spatial resolution within the data set arcsec pos.angResolution
s_xel1 |X| Number of elements (typically pixels) along the first spatial axis. N/A meta.number
s_xel2 |Y| Number of elements (typically pixels) along the second spatial axis. N/A meta.number
source_table Source Table Name of a TAP-queriable table this data originates from. This source table usually provides more information on the the data than what is given in obscore. See the TAP_SCHEMA of the originating TAP server for details. N/A meta.id;meta.table
t_exptime Exp. Time Total exposure time s time.duration;obs.exposure
t_max T_max Upper bound of times represented in the data set d time.end;obs.exposure
t_min Min. t Lower bound of times represented in the data set d time.start;obs.exposure
t_resolution Res. t Minimal significant time interval along the time axis s time.resolution
t_xel |t| Number of elements (typically pixels) along the time axis. N/A meta.number
target_class Target Class Class of the target object (star, QSO, ...) N/A src.class
target_name Target Name Object a targeted observation targeted N/A meta.id;src

Columns that are parts of indices are marked like this.

Other

The following services may use the data contained in this table:

VOResource

VO nerds may sometimes need VOResource XML for this table.

Notes

Note calib

The calib_level flag takes the following values:

0 Raw Instrumental data requiring instrument-specific tools
1 Instrumental data processable with standard tools
2 Calibrated, science-ready data without instrument signature
3 Enhanced data products (e.g., mosaics)