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Term | Explanation |
---|---|
Detection | Catalog data for a single source from a single exposure. |
Object | Catalog data for one or more associated detections. |
OTA | Orthogonal Transfer Array. An OTA consists of an 8 x 8 array of 600 x 600 pixel CCD cells. The PS1 camera consists of 60 OTAs. |
PSPS | Published Science Product System. This is the PS1 object database. |
Sky cell | One tile in the PS1 tessellation of the sky. |
Stack image | Image constructed by combining all useful warp images that overlap a single sky cell. Sometimes simply referred to as a "stack". |
Stack detection | Catalog data for a single source from a stack image. |
Stack object | Catalog data for one or more associated stack detections. |
Tessellation | The scheme used to cover the spherical sky with a regular pattern of rectangular images in a manner that leaves no gaps in coverage. |
Warp image | Image constructed by resampling a single exposure onto a canonical sky cell projection. Sometimes simply referred to as a "warp". |
Ubercal | The process that uses comparisons in flux measurements from overlapping exposures to improve the global calibration. |