Final Catalog Duplicate Resolution for Confused Sources
Duplicate resolution for confused sources in the Final Catalog utilized the same distance-to-edge criteria
as the non-confused duplicate resolution process. This differs from the Second Incremental Release,
where no attempt was made to select a 'best' apparition for confused sources resulting in the release all apparitions for a confused source.
Implementing the same
distance to edge algorithm as for the non-confused sources in overlap regions provides a
consistent selection algorithm for all sources within overlap regions.
A feature of the selection algorithm, illustrated in the images shown, is that the source selected in confused situations may not be a fully band merged source. A source can have multiple apparitions in one scan, due to a band merge failure, and a fully merged apparition in the overlapping scan. The apparition selected for the Final Catalog may be the fully merged apparition or the partial apparition, depending on which passes the distance-to-edge criteria.
The following images illustrate the selection process. Each image represent an actual confused source. Sources selected for illustration have SNR>20 in J band.
The nodes represent apparitions. Within each node the apparition is identified with its CNTR number, RD_FLG in (), final DUP_FLG and USE_flg as a dashed number and distance to edge values in ().
A PSEUDO source is represented with a triangular node symbol and the selected apparition is represented with a star node symbol. A single row of nodes represent apparitions from a single scan.
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| Figure 1 | Figure 2 | Figure 3 |
[Last Updated: 2002 Oct 30; by Sherry Wheelock]