The EXPCOUNT keyword will be used to count the number of exposures in a visit. The value for the EXPOSURE keyword is intially extracted from the image header in the science telemetry and is reset for each new activity within a visit. Science Data Processing code (SDP) determines a monotonically increasing exposure count within a visit, and capture that number in the EXPCOUNT keyword value. This exposure count will reflect the order in which the exposures were executed.
| Attribute | Value |
|---|---|
| data type | integer |
| enumerated Values | not defined |
| units | |
| example | |
| default value | |
| special processing | VALUE_REQUIRED |
| source | Science Data Processing (SDP) |
| software source | |
| calculation | = int(obsid('ACT_ID')) / count of the exposures in visit |
| DB destination | ['ScienceCommon.expcount'] |
| data type in DB | int |
| instrument | Multiple |
| mode | All |
| product level | 1b |
| FITS hdu | PRIMARY |
| FITS header section | Exposure |