The AllWISE Atlas Image/Frame Cross Reference Table provides a listing of all individual Single-exposure image frames that contribute to the Atlas Image in each band. It can be used to determine which image frames contribute to a given Atlas Image, or it can be used to determine to which Atlas Images a particular Single-exposure image frame contributes. The criteria used to select and filter the scans, framesets and frames that are used as input for the Multiframe pipeline processing that generates the coadded Atlas Images and extracted Source Catalog are described in V.1.b.
The following table contains brief descriptions of the parameters provided for each record the AllWISE Atlas Image/Frame Cross Reference Table.
The columns in the following table are:
|coadd_id||%20s||----||no||Atlas Tile identifier from which source was extracted. The identifier
has the general form: RRRRsDDd_[trev], where
For example, the identifier of the Atlas Tile with center at (α,δ = 304.13896,-13.63000) is 3041m137_ac51.
|band||%1d||----||no||WISE band number. 1=W1, 2=W2, 3=W3, 4=W4.|
|scan_id||%6s||----||no||Scan identifier. This is a six character string that identifies a block of
survey exposures that are acquired between two flight system maneuvers,
such as reorientation of the instrument boresite near the ecliptic poles,
or slews to acquire TDRSS for data downlink contacts. Because
maneuvers often take place near the ecliptic poles, the scan number
is roughly associated with a half-orbit's worth of images. However,
scans can cover less or more than half of the arc between ecliptic poles.
The scan_id has the general form SSSSSx, where
The first scan whose data are used in AllWISE is scan 00712a. This was the first scan after the NEP crossing in the 356th WISE orbit. The final scan included in the Release is 12514a, the first scan after the SEP crossing in the 6257th WISE orbit.
|frame_num||%3d||----||no||Number of the frameset on which this source was extracted. The
identifier has the general form MMM, a zero-filled
The frameset number is computed based on time bins which count from the scan start time:
For example, a frame with a start time 1234 secs after the scan start time would have a frame number of 124.
|load_id||%3d||----||no||This is an internal archive accounting number that tracks in what batch of data the information in this record were loaded into the database.|
|cntr||%10d||----||no||Unique identification number for the Atlas Image Frame Cross Reference table entry created sequentially in the order of the Archive load processing.|
Last Updated: 22 November 2013