NOAA Polar Orbiter Data User's Guide
Section 1.4.8
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1.4.8 NOAA-12
Operational dates: September 16, 1991 to December 14, 1998
Morning orbit: 1930 LST ascending node, 0730 descending node
AVHRR instrument: 5 channels
Spacecraft ID: 5
Table 1.4.8-1 contains the central wave numbers for the AVHRR IR
channels for NOAA-12. Table 1.4.8-2 contains the TOVS channel
spectral response and HIRS/2 thermal band-correction coefficients
for NOAA-12. Non-linearity corrections for NOAA-12 AVHRR Channels 4
and 5 are contained in Tables 1.4.8-3 and 1.4.8-4. The
non-linearity corrections are the difference between the measured
target temperature and that temperature derived from a two-point
linear calibration using a radiance of space (Nsp) of
zero. The non-linearity correction can be obtained from Tables
1.4.8-3 and 1.4.8-4 by interpolation on the scene temperatures and
the temperatures of the AVHRR's internal calibration target.
Figures 1.4.8-1 through 1.4.8-5 contain the spectral response
curves for NOAA-12 AVHRR channels 1 through 5, respectively.
Table 1.4.8-1. NOAA-12 Central Wave Numbers for AVHRR IR
Channels.
| Temperature Range (K) |
Channel 3 (cm-1) |
Channel 4 (cm-1) |
Channel 5 (cm-1) |
| 190-230 |
2632.713 |
920.0158 |
836.6847 |
| 230-270 |
2636.669 |
920.5504 |
837.0251 |
| 270-310 |
2639.61 |
921.0291 |
837.3641 |
| 290-330 |
2640.817 |
921.2741 |
837.5612 |
| Note: The 270-310 K range is applicable for sea
surface temperatures. |
Table 1.4.8-2. NOAA-12 TOVS Channel Spectral Response and
HIRS/2 Thermal Band-Correction Coefficients.
| Instrument |
Channel # |
Central Wave # |
Description |
HIRS/2 Band-Correction
Coefficients |
| b |
c |
| HIRS/2 |
1 |
667.58 cm-1 |
15 micrometers |
0.007 |
0.99996 |
| 2 |
680.18 cm-1 |
CO2 Band |
0.007 |
0.99995 |
| 3 |
690.01 cm-1 |
CO2 Band |
0.019 |
0.99989 |
| 4 |
704.22 cm-1 |
CO2 Band |
0.026 |
0.99988 |
| 5 |
716.32 cm-1 |
CO2 Band |
0.021 |
0.99990 |
| 6 |
732.81 cm-1 |
CO2 Band |
0.140 |
0.99964 |
| 7 |
751.92 cm-1 |
CO2 Band |
0.058 |
0.99982 |
| 8 |
900.45 cm-1 |
Window |
0.358 |
0.99940 |
| 9 |
1026.66 cm-1 |
Ozone |
0.181 |
0.99985 |
| 10 |
1223.44 cm-1 |
Water Vapor |
0.377 |
0.99975 |
| 11 |
1368.68 cm-1 |
Water Vapor |
0.175 |
0.99992 |
| 12 |
1478.59 cm-1 |
Water Vapor |
0.265 |
0.99863 |
| 13 |
2190.37 cm-1 |
4.3 micrometers |
0.078 |
1.00042 |
| 14 |
2210.51 cm-1 |
CO2 Band |
0.017 |
0.99995 |
| 15 |
2236.62 cm-1 |
CO2 Band |
-0.023 |
0.99950 |
| 16 |
2267.62 cm-1 |
CO2 Band |
0.021 |
0.99995 |
| 17 |
2361.64 cm-1 |
CO2 Band |
0.022 |
0.99997 |
| 18 |
2514.68 cm-1 |
Window |
0.058 |
0.99992 |
| 19 |
2653.48 cm-1 |
Window |
0.344 |
0.99950 |
| 20 |
14453.14 cm-1 |
Visible Window |
n/a |
n/a |
| MSU |
1 |
1.6799 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 |
Instrument not flown on NOAA-12 |
Table 1.4.8-3. Non-linearity errors for NOAA-12 Channel
4.
| Target temperature (K) |
Internal Target Temperature (Degrees
C) |
| 10 |
15 |
20 |
25 |
| 320 |
3.21 |
2.88 |
2.27 |
1.91 |
| 315 |
2.58 |
2.39 |
1.72 |
1.43 |
| 310 |
2.04 |
1.94 |
1.28 |
0.98 |
| 305 |
1.6 |
1.42 |
0.8 |
0.52 |
| 295 |
0.8 |
0.53 |
0.13 |
-0.16 |
| 285 |
0.16 |
-0.23 |
-0.52 |
-0.7 |
| 275 |
-0.41 |
-0.84 |
-1.05 |
-1.19 |
| 265 |
-.071 |
-0.97 |
-1.19 |
-1.32 |
| 255 |
-1.04 |
-1.2 |
-1.53 |
-1.59 |
| 245 |
-1.18 |
-1.4 |
-1.58 |
-1.62 |
| 235 |
-1.05 |
-1.59 |
-1.51 |
-1.63 |
| 225 |
-1.33 |
-1.65 |
-1.58 |
-1.67 |
| 215 |
-1.24 |
-1.65 |
-1.49 |
-1.53 |
| 205 |
-1.58 |
-1.8 |
-1.31 |
-1.33 |
Table 1.4.8-4. Non-linearity errors for NOAA-12 Channel
5.
| Target temperature (K) |
Internal Target Temperature (Degrees
C) |
| 10 |
15 |
20 |
25 |
| 320 |
0.8 |
0.8 |
0.8 |
0.73 |
| 315 |
0.8 |
0.8 |
0.73 |
0.61 |
| 310 |
0.8 |
0.73 |
0.61 |
0.37 |
| 305 |
0.73 |
0.61 |
0.37 |
0.18 |
| 295 |
0.37 |
0.18 |
0.08 |
-0.08 |
| 285 |
0.08 |
-0.08 |
-0.21 |
-0.31 |
| 275 |
-0.21 |
-0.31 |
-0.37 |
-0.41 |
| 265 |
-0.37 |
-0.41 |
-0.47 |
-0.53 |
| 255 |
-0.47 |
-0.53 |
-0.63 |
-0.76 |
| 245 |
-0.63 |
-0.76 |
-0.88 |
-0.94 |
| 235 |
-0.88 |
-0.94 |
-1.01 |
-1.1 |
| 225 |
-1.01 |
-1.1 |
-1.15 |
-1.19 |
| 215 |
-1.15 |
-1.19 |
-1.17 |
-1.16 |
| 205 |
-1.17 |
-1.16 |
-1.19 |
-1.23 |
Table 1.4.8-5. PRT coefficients for all instruments on
NOAA-12 (from NESS 107, App. B).
| 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 |
| Radiance of space (Nsp) including
nonlinearity correction |
| Channel |
Nsp
(mW/sr-m2-cm-1) |
| 3 |
0.0 |
| 4 |
0.0 |
| 5 |
0.0 |
| HIRS |
| IWT PRT Count to temperature coefficients |
| PRT |
a0 |
a1 |
a2 |
a3 |
a4 |
| 1 |
301.38300 |
6.52454E-03 |
8.63834E-08 |
4.81705E-11 |
1.17918E-15 |
| 2 |
301.38490 |
6.51937E-03 |
8.61601E-08 |
4.81257E-11 |
1.17221E-15 |
| 3 |
301.39920 |
6.51150E-03 |
8.58417E-08 |
4.80590E-11 |
1.17105E-15 |
| 4 |
301.38770 |
6.52702E-03 |
8.63606E-08 |
4.81834E-11 |
1.177669E-15 |
| SSU - No SSU instrument aboard NOAA-12 |
| MSU |
| PRT Count to resistance coefficients |
| K0 |
495.6 |
| K1 |
107.8 |
| PRT Resistance to temperature coefficients |
| |
e0 |
e1 |
e2 |
| 1A |
29.3970 |
.4256561 |
.3238697E-04 |
| 2A |
28.4527 |
.4293800 |
.2974601E-04 |
| 1B |
28.1854 |
.4302196 |
.2920356E-04 |
| 2B |
28.9588 |
.4276377 |
.3033068E-04 |
| Radiance of space (Nsp) |
| Channel |
Nsp( mW/sr- m2 -
cm-1) |
| 1 |
0.000086 |
| 2 |
0.000096 |
| 3 |
0.000084 |
| 4 |
0.000092 |
Amended May 5,
1999