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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. |
| 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. |
| Tesselation | The scheme used to cover the sky by repeated use of the focal plane footprint. |
| 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. |
