The AVHRR data are digitized to 10-bit precision. The digitized data are both transmitted from
the satellite in real-time as High Resolution Picture Transmission (HRPT) data, and selectively
recorded on board the satellite for subsequent playback as Local Area Coverage (LAC) data. A
maximum of ten minutes of LAC data may be recorded per orbit. In all other respects, HRPT
and LAC are identical. Table 8.3.1.3.1-1 summarizes fundamental characteristics of the data.
Table 8.3.1.3.1-1. LAC/HRPT Data Characteristics.
|
Parameter |
Value |
|---|
| Sample word size |
10 bits |
| Number of sampled channels/available channels |
5/6 |
| Number of Earth samples per scan |
2,048 per channel |
| Scan rate |
360 scans per minute |
| Scan direction |
East to West (northbound) |
| Instantaneous Field of View (IFOV) |
0.07449 degrees (all channels) |
| Spatial resolution at nadir |
1.09 km at 833 km altitude |
| Cross track distance between sample centers at nadir |
1.09 km at 833 km altitude |
| Along track distance between sample centers at nadir |
1.09 km at 833 km altitude |
| Cross-track scan coverage |
± 55.4 degrees from nadir |
| Swath width |
2,399 km at 833 km altitude |
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