NOAA Polar Orbiter Data User's GuideSection 1.4.9 |
Introduction Page, NOAA POD Guide TOC, AcronymsOperational dates: Aug. 9, 1993 - Aug. 21, 1993
Afternoon orbit: 1340 LST ascending node, 0140 descending node
AVHRR instrument: 5 channels
Spacecraft ID: 3
Table 1.4.9-1 contains the central wave numbers for the AVHRR IR channels for NOAA-13. Table 1.4.9-2 contains the TOVS channel spectral response and HIRS/2 thermal band-correction coefficients for NOAA-13. Non-linearity corrections for NOAA-13 AVHRR Channels 4 and 5 are contained in Table 1.4.9-3. The non-linearity correction can be obtained from Table 1.4.9-3 by interpolation on the scene temperatures and the temperatures of the AVHRR's internal calibration target.
With the launch of NOAA-13, NESDIS changed their method of handling the non-linearity correction. See Section 3.3.1.2 for NESDIS' alternate method for calculating the non-linearity correction. Use Equation 3.3.1.2-1 to calculate the corrected radiance. Table 1.4.9-4 contains the coefficients A, B, and D for the quadratic equation in Equation 3.3.1.2-1 and the radiance of space which are required to calculate the corrected radiance.
Figures 1.4.9-1 through 1.4.9-5 contain the spectral response curves for NOAA-13 AVHRR channels 1 through 5, respectively.
| Temperature Range (K) | Channel 3 (cm-1) | Channel 4 (cm-1) | Channel 5 (cm-1) |
|---|---|---|---|
| 190-230 | 2636.124 | 924.0114 | 836.1164 |
| 230-270 | 2640.147 | 924.5165 | 836.4339 |
| 270-310 | 2643.153 | 924.9732 | 836.7651 |
| 290-330 | 2644.382 | 925.2164 | 836.9520 |
| Note: The 270-310 K range is applicable for sea surface temperatures. | |||
| Instrument | Channel # | Central Wave # | Description | HIRS/2 Band-Correction Coefficients | |
|---|---|---|---|---|---|
| b | c | ||||
| HIRS/2 | 1 | 668.81 cm-1 | 15 micrometers | -0.077 | 1.00019 |
| 2 | 679.59 cm-1 | CO2 Band | 0.020 | 0.99992 | |
| 3 | 690.18 cm-1 | CO2 Band | 0.016 | 0.99993 | |
| 4 | 703.02 cm-1 | CO2 Band | 0.018 | 0.99991 | |
| 5 | 715.96 cm-1 | CO2 Band | 0.040 | 0.99986 | |
| 6 | 732.98 cm-1 | CO2 Band | 0.028 | 0.99987 | |
| 7 | 749.34 cm-1 | CO2 Band | -0.034 | 1.00000 | |
| 8 | 902.39 cm-1 | Window | 0.544 | 0.99916 | |
| 9 | 1028.77 cm-1 | Ozone | 0.062 | 0.99979 | |
| 10 | 792.82 cm-1 | Water Vapor | -0.005 | 0.99994 | |
| 11 | 1359.95 cm-1 | Water Vapor | 0.090 | 0.99972 | |
| 12 | 1479.90 cm-1 | Water Vapor | 0.292 | 0.99931 | |
| 13 | 2189.06 cm-1 | 4.3 micrometers | 0.022 | 0.99997 | |
| 14 | 2212.55 cm-1 | CO2 Band | 0.021 | 0.99997 | |
| 15 | 2231.68 cm-1 | CO2 Band | 0.029 | 0.99993 | |
| 16 | 2267.04 cm-1 | CO2 Band | 0.022 | 0.99999 | |
| 17 | 2418.31 cm-1 | CO2 Band | 0.025 | 0.99992 | |
| 18 | 2516.80 cm-1 | Window | 0.058 | 0.99970 | |
| 19 | 2653.33 cm-1 | Window | 0.264 | 0.99927 | |
| 20 | 14453.14 cm-1 | Visible Window | n/a | n/a | |
| MSU | 1 | 1.6779 cm-1 | n/a | n/a | n/a |
| 2 | 1.7927 cm-1 | n/a | n/a | n/a | |
| 3 | 1.8334 cm-1 | n/a | n/a | n/a | |
| 4 | 1.9331 cm-1 | n/a | n/a | n/a | |
| SSU | 1 | 669.988 cm-1/15 mb | n/a | n/a | n/a |
| 2 | 669.628 cm-1/5 mb | n/a | n/a | n/a | |
| 3 | 669.357 cm-1/1.5 mb | n/a | n/a | n/a | |
| Scene temperature (K) | Temperature Corrections | |
|---|---|---|
| Channel 4 | Channel 5 | |
| 320 | 0.25 | 0.20 |
| 315 | 0.07 | 0.03 |
| 310 | -0.01 | -0.02 |
| 305 | -0.09 | -0.06 |
| 295 | -0.00 | 0.01 |
| 285 | 0.07 | 0.01 |
| 275 | 0.24 | 0.13 |
| 265 | 0.87 | 0.40 |
| 255 | 1.47 | 0.70 |
| 245 | 2.14 | 1.05 |
| 235 | 3.32 | 1.43 |
| 225 | 4.53 | 2.27 |
| 215 | 5.93 | 3.02 |
| 205 | 9.42 | 3.96 |
| Radiance Correction Coefficients | Channel 4 | Channel 5 |
|---|---|---|
| A | 0.91159 | 0.94784 |
| B | 0.0003820 | 0.0002057 |
| D | 5.01 | 3.24 |
| Radiance of Space, Rsp | -5.31 | -3.28 |
| AVHRR | |||||
|---|---|---|---|---|---|
| PRT counts to temperature coefficients | |||||
| PRT | a0 | a1 | a2 | a3 | a4 |
| 1 | 276.597 | 0.051275 | 1.363E-6 | 0.0 | 0.0 |
| 2 | 276.597 | 0.051275 | 1.363E-6 | 0.0 | 0.0 |
| 3 | 276.597 | 0.051275 | 1.363E-6 | 0.0 | 0.0 |
| 4 | 276.597 | 0.051275 | 1.363E-6 | 0.0 | 0.0 |
| PRT weighting factors | |||||
| b1 | b2 | b3 | b4 | ||
| 0.25 | 0.25 | 0.25 | 0.25 | ||
| HIRS | |||||
| IWT PRT Count to temperature coefficients | |||||
| PRT | a0 | a1 | a2 | a3 | a4 |
| 1 | 301.37210 | 6.52057E-03 | 9.05197E-08 | 4.73741E-11 | 8.29062E-16 |
| 2 | 301.37560 | 6.52283E-03 | 9.13565E-08 | 4.73871E-11 | 7.86019E-16 |
| 3 | 301.41250 | 6.51819E-03 | 9.18444E-08 | 4.75139E-11 | 7.30508E-16 |
| 4 | 301.37420 | 6.51875E-03 | 9.04524E-08 | 4.72894E-11 | 8.06020E-16 |
| SSU | |||||
| PRT count to temperature coefficients | |||||
| a0 | a1 | a2 | |||
| 284.125 | 4.819E-03 | 8.75E-09 | |||
| Thermistor to temperature coefficients | |||||
| b0 | b1 | b2 | b3 | ||
| 375.969 | -203.161 | 179.13 | -85.16 | ||
| c0 | c1 | c2 | c3 | ||
| 375.969 | -203.161 | 179.13 | -85.16 | ||
| MSU | |||||
| PRT Count to resistance coefficients | |||||
| e0 | e1 | e2 | |||
| 1A | 28.74552 | .4278088 | .3056633E-04 | ||
| 2A | 28.86749 | .4263018 | .3083285E-04 | ||
| 1B | 28.73856 | .4335265 | .3147607E-04 | ||
| 2B | 28.67430 | .4282688 | .3054580E-04 | ||
| Radiance of space (Nsp) | |||||
| Channel | Nsp( mW/sr- m2 - cm-1) | ||||
| 1 | 0.000086 | ||||
| 2 | 0.000096 | ||||
| 3 | 0.000084 | ||||
| 4 | 0.000092 | ||||
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