By C. J. Tucker (auth.), Giles D’Souza, Alan S. Belward, Jean-Paul Malingreau (eds.)
An up to date, particular set of notes overlaying all points of NOAA AVHRR facts assortment, pre-processing, research and alertness. contains many FTP websites, email addresses and URL destinations. a few chapters tackle specific points of the NOAA AVHRR approach, akin to radiometric calibration and geometric correction, whereas others supply normal info of curiosity to any distant sensing research, comparable to radiative move modelling and atmospheric correction. The ebook of a booklet that covers all vital features of the remedy and knowing of the knowledge in a single quantity makes the paintings a handy, informative `recipe e-book' that's guaranteed to turn into a favorite for all clients of NOAA AVHRR data.
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Additional info for Advances in the Use of NOAA AVHRR Data for Land Applications
The "instrument operating temperature" is represented by the temperature of the instrument's baseplate, which is kept at approximately the same temperature as its internal warm blackbody. The operating temperatures for the baseplate used in calibration tests are 10, 15 and 20°C for AVHRRs on-board NOAA's 6-11 and 10,15,20 and 25°C for NOAA 12. The instrument manufacturers and NOAA-NESDIS then independently analyse the prelaunch test data in order to determine various operating characteristics of the instruments, such as their signal-to-noise ratios, stability, linearity of response, and sensitivity (output in digital counts per unit incident radiance).
During the laboratory calibration phase, the warm calibrated laboratory blackbody is cycled through a sequence of temperature plateaux approximately 10K apart between 175 and 320K, which spans the entire range of possible Earth target temperatures (including clouds and oceans). From the laboratory data, for each of the target temperature plateaux, radiances for each channel can then be computed using the inverse Planck law and related to the 0-1023 levels yielded by the sensor. However, as the responsivity is partly a function of the instrument's temperature, the entire procedure is carried out independently for several instrument operating temperatures that encompass the range of operating temperatures encountered in orbit.
The likely error is larger for channel 3 than for the thermal channels. Errors resulting from the different methods of radiance to brightness temperature conversion are very small in comparison with errors of non-linear correction for channels 4 and 5. 3. Non-linearity corrections. Once the radiance values have been converted to brightness temperatures, the non-linear corrections should be applied (for pre-NOAA 14 sensors). This requires the use of the non-linear correction tables, interpolating values according to the calculated brightness temperature, and the derived temperature of the internal calibration target.
Advances in the Use of NOAA AVHRR Data for Land Applications by C. J. Tucker (auth.), Giles D’Souza, Alan S. Belward, Jean-Paul Malingreau (eds.)