Improved method for calibrating the visible and near-infrared channels of the National Oceanic and Atmospheric Administration Advanced Very High Resolution Radiometer.
Two procedures are used to establish calibration of the visible and near-infrared channels of the National Oceanic and Atmospheric Administration-11 (NOAA-II) Advanced Very High Resolution Radiometer (AVHRR). The first procedure for visible spectra, uses satellite data, ground measurements of atmospheric conditions during satellite overpass, and historical surface reflectance values at White Sands Missile Range (WSMR) in New Mexico. The second procedure, for the near-infrared, uses knowledge of the reflective properties at the WSMR and of a low-reflectance area, as determined from the first method, that yields satellite-gain values without a requirement for ground measurements of atmospheric conditions. The accuracy of gain values is estimated at ±7% for the two methods. The WSMR combines accessibility, a wide range of surface reflectances, and generally good observing conditions, making it a desirable location for satellite calibration.
Che
N
N
Price
J C
JC