NOAA KLM User's Guide

Section 8.3.1.5.1.1
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8.3.1.5.1.1 HIRS/3

HIRS/3 radiometric data is digitized to 13-bit precision. The data is recorded on the satellite and transmitted to Earth on command. Table 8.3.1.5.1-1 summarizes fundamental characteristics of the data.

Table 8.3.1.5.1.1-1. HIRS/3 Data Characteristics.
Parameter Value
Sample word size 13 bits
Number of sampled channels/available channels 20/20
Number of Earth samples per scan 56 per channel
Scan rate 9.4 scans per minute
Scan direction West to East (northbound)
Instantaneous Field of View (IFOV) 1.3 to 1.4 degrees
Spatial resolution at nadir 18.9 to 20.3 km at 833 km altitude
Cross track distance between sample centers at nadir 26.2 km at 833 km altitude
Along track distance between sample centers at nadir 42 km at 833 km altitude
Cross-track scan coverage +/- 49.5 degrees from nadir
Swath width 2240 km at 833 km altitude

Amended April 19, 2004

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