Table 2. Error budget for AVHRR channels

               Channels              Channel                  Channels
 Source of       1,2                    3                       4,5
Uncertainty      (%)                   (K)                      (K)
-----------  ------------  --------------------------  ----------------------
Pre-launch   ~+/- 5(a)     ~+/- 0.4(b)                 ~+/- 0.4(b)
Detector     ?             ?                           ~+/- 0.05(c)
Periodic     ?             +/- 0.3 - +/- 1.5+/- (c,d)  0(c)
In-flight    N/A           ?                           ~+/- 0.2(b,e)
Degradation  0-6%/yr(f,g)  --(h)
Total        5-20          ~+/- 0.55 - +/- 1.7(i)      ~+/- 0.55 - +/- 1.7(i)
------------------------
(a) Abel 1990.
(b) Weinreb et al. 1990.
(c) Dudhia 1989.
(d) Warren 1989.
(e) Brown et al. 1985.
(f) Staylor 1990.
(g) Can be corrected; see Staylor 1990.
(h) Included in estimate of periodic uncertainties, but shows a strong 
    temporal signal; see Warren 1989.
(i) It is not clear that these uncertainties can be significantly reduced by
    spatial averaging, as all but the random/digitizer noise are likely to be
    systematic within a given overpass.