NOAA Polar Orbiter Data User's Guide

Section 1.4.3
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1.4.3 NOAA-7

Operational dates: August 24, 1981 - February 1, 1985

Afternoon orbit: 1430 LST ascending node, 0230 LST descending node

AVHRR instrument: 5 channels

Spacecraft ID: 4

Table 1.4.3-1 contains the central wave numbers for the AVHRR IR channels for NOAA-7. Table 1.4.3-2 contains the TOVS channel spectral response and HIRS/2 thermal band-correction coefficients for NOAA-7. Non-linearity errors for NOAA-7 AVHRR Channels 4 and 5 are contained in Table 1.4.3-3. Table 1.4.3-4 contains values of the corrected radiance of space, Nsp (which includes the non-linearity correction) for the NOAA-7 AVHRR IR channels.

Figures 1.4.3-1 through 1.4.3-5 contain the spectral response curves for NOAA-7 AVHRR Channels 1 through 5, respectively.

Table 1.4.3-1. NOAA-7 Central Wave Numbers for AVHRR IR Channels.
Temperature Range (K) Channel 3 (cm-1) Channel 4 (cm-1) Channel 5 (cm-1)
180-225 n/a 926.20 840.100
225-275 2670.3 926.80 840.500
275-320 2671.9 927.22 840.872
Table 1.4.3-2. NOAA-7 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 1 667.92 cm-1 15 micrometers -0.010 1.00001
2 679.21 cm-1 CO2 Band 0.100 0.99973
3 691.56 cm-1 CO2 Band -0.018 0.99997
4 704.63 cm-1 CO2 Band 0.026 0.99989
5 717.05 cm-1 CO2 Band -0.009 0.99995
6 733.20 cm-1 CO2 Band -0.081 1.00008
7 749.20 cm-1 CO2 Band -0.054 1.00003
8 898.94 cm-1 Window 0.332 0.99942
9 1027.38 cm-1 Ozone 0.205 0.99987
10 1224.89 cm-1 Water Vapor 0.469 0.99994
11 1363.85 cm-1 Water Vapor 0.114 0.99983
12 1489.06 cm-1 Water Vapor 0.573 1.00028
13 2183.05 cm-1 4.3 micrometers 0.047 1.00013
14 2208.28 cm-1 CO2 Band 0.060 1.00028
15 2239.84 cm-1 CO2 Band 0.021 0.99993
16 2271.33 cm-1 CO2 Band 0.032 1.00008
17 2357.55 cm-1 CO2 Band 0.032 1.00005
18 2512.83 cm-1 Window 0.026 0.99968
19 2663.79 cm-1 Window 0.637 1.00171
20 14453.14 cm-1 Visible Window n/a n/a
MSU 1 1.6779 cm-1      
2 1.7927 cm-1      
3 1.8337 cm-1      
4 1.9331 cm-1      
SSU 1 669.988 cm-1/15 mb      
2 669.628 cm-1/5 mb      
3 669.357 cm-1/1.5 mb      

Table 1.4.3-3. Non-linearity errors for NOAA-7 Channels 4 and 5.
Target temperature (K) Channel 4 Error (K) Channel 5 Error (K)
315 1.66 1.08
305 1.05 0.64
295 0.49 0.31
285 0.0 0.0
275 -0.38 -0.22
255 -0.66 -0.55
235 -0.73 -0.86
225 -0.61 -0.71
205 -0.19 -0.86
0 0.0 0.0

Table 1.4.3-4. Corrected values for NOAA-7 Nsp.
Channel Nsp (mW/(m2-sr-cm-1))
3 0.0
4 -1.176
5 -1.346

Table 1.4.3-5. PRT coefficients for all instruments on NOAA-7 (from NESS 107, App. B).
AVHRR
PRT counts to temperature coefficients
PRT a0 a1 a2 a3 a4
1 277.099 5.048E-2 2.823E-6 0.0 0.0
2 276.734 5.069E-2 2.493E-6 0.0 0.0
3 276.876 5.148E-2 1.040E-6 0.0 0.0
4 276.160 5.128E-2 1.414E-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 -1.176
5 -1.346
HIRS
IWT PRT Count to temperature coefficients
PRT a0 a1 a2 a3 a4
1 301.44 6.6679E-03 1.4998E-07 5.5231E-11 0.0
2 301.91 7.2367E-03 4.2741E-07 9.0509E-11 0.0
3 301.88 7.1208E-03 3.7177E-07 8.2989E-11 0.0
4 301.41 6.4985E-03 6.3052E-08 4.1470E-11 0.0
SSU
PRT count to temperature coefficients
a0 a1 a2
283.9218 4.85751E-03 0.0
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
K0 495.6
K1 107.8
PRT Resistance to temperature coefficients
  e0 e1 e2
1A 28.976 .42694 .31737E-04
2A 28.995 .42627 .31775E-04
1B 28.945 .42628 .31603E-04
2B 28.964 .42498 .31389E-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-7 spectral response curve for AVHRR Channel 1

Figure showing NOAA-7 spectral response curve for AVHRR Channel 2

Figure showing NOAA-7 spectral response curve for AVHRR Channel 3

Figure showing NOAA-7 spectral response curve for AVHRR Channel 4

Figure showing NOAA-7 spectral response curve for AVHRR Channel 5

Amended May 5, 1999

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