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


Figure showing NOAA-12 spectral response curve for AVHRR Channel 1

Figure showing NOAA-12 spectral response curve for AVHRR Channel 2

Figure showing NOAA-12 spectral response curve for AVHRR Channel 3

Figure showing NOAA-12 spectral response curve for AVHRR Channel 4

Figure showing NOAA-12 spectral response curve for AVHRR Channel 5

Amended May 5, 1999


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