McIDAS Programmer's Manual
Version 2003

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HIRSCRPF

HIRS calibration reference parameters.

HIRS calibration reference parameters are used to compute HIRS brightness temperatures. This binary file is organized chronologically by satellite with the last record being the most recent. Each record contains 48 words.

The first record is a header record. The following records contain data. Words 0 through 39 in the data records are the coefficients of fourth degree polynomials used to convert platinum resistance thermistor count values to temperatures. The first four words in each group of eight are for the warm blackbody target, and the fifth through eighth words in each group are for the cool blackbody, which is not routinely used in the calibration process.

This file is supplied with McIDAS-X.

For HIRS calibration reference parameters Application Program Interfaces (APIs), refer to the API functions list at the end of this section.

Word allocation for record 1

Word Description

0

total number of records in the file

1 - 47

unused

Word allocation for records 2 through n

Word Description

0 - 7

array of thermistor counts-to-temperature coefficients, zeroth order

8 - 15

array of thermistor counts-to-temperature coefficients, first order

16 - 23

array of thermistor counts-to-temperature coefficients, second order

24 - 31

array of thermistor counts-to-temperature coefficients, third order

32 - 39

array of thermistor counts-to-temperature coefficients, fourth order

40 - 43

array of weights for blackbody target temperature

44

coefficient for calibrating the HIRS visible channel

45

reserved

46

NOAA satellite number

47

date, yyyddd

API functions

Function Description

hircon

initializes the HIRS constants

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