For the most part, the Level 0 data records correspond to the processed observable proxies based on the camera images taken over designated intervals, typically 30 or 60 seconds, but longer for certain data products. Some represent individual camera frames, and some are memory and table dumps from the image processor.
Level 0 data are distinguished by a Data Product Code (DPC), a 32-bit number assigned to each unique image processing program. Individual records for a given DPC are distinguished by a reference time and in some cases a frame number as well. Over the course of the mission, records associated with each DPC were gathered together in a data series and collected into chunks of either 1 hour or 1 day, depending on the DPC and the associated telemetry stream from which they derived (high-rate or low-rate).
A total of 689 unique DPC's occur in originally processed Level 0 data*. Of these, however, 225 are invalid codes, caused by corruption of telemetry packets, and contain no actual data. The remaining 464 DPC's are distributed as follows:
The following DPC's exist in both daily and hourly data series:
The 34 group records in series cal_detune2_cal and cal_detune2_obs (17 in each) are a special case. They have series numbers in the range 3050160–3050219 and 3055193–3055199, which are much too large to correspond to mission hours. They would correspond to mission minutes in the time ranges 1998.10.20_04:00 – 04:59 and 1998.10.23_15:53 – 15:59. Like most other level 0 data series, they do not contain a DPC keyword explicitly, so it is not clear what prime DPC key they should be assigned to. However, like the Level 0 data series for DPC's 4???6007, they were apparently also the result of ground processing of Level 0 data, in these cases from DPC's 404d4400 (cal_detune2_cal) and 404e4400 (cal_detune2_obs). They do not represent independent instrument data.
| Camera Images | Low-Rate Data | Low-Rate Dumps | High-Rate Data | High-Rate Dumps | Test and Fill |
|---|---|---|---|---|---|
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| this page last modified 1 Sep 2017, 13:57-0700 |