Title :
Estimation of the ratio of sensor degradation between NOAA AVHRR channels 1 and 2 from monthly NDVI composites
Author_Institution :
Biospheric Sci. Branch, NASA Goddard Space Flight Center, Greenbelt, MD, USA
fDate :
1/1/1998 12:00:00 AM
Abstract :
Vegetation monitoring, based on the normalized difference vegetation index (NDVI) calculated from the Advanced Very High Resolution Radiometer (AVHRR) channels 1 and 2 data, requires continuous updates of calibration coefficients to correct for the sensor degradation in these channels. A method was developed to estimate calibration coefficients with monthly composited NDVI data from desert targets without recourse to the component channels 1 and 2 data. The method was tested on NDVI data from the AVHRR onboard the NOAA-7, -9, and -11 satellites for the period from 1982 until 1993. The results of the method outlined in this paper correlated high r, between 0.94 and 0.95, with the results from other studies that estimated sensor degradation for the individual AVHRR bands
Keywords :
calibration; geophysical equipment; geophysical techniques; image sensors; remote sensing; 650 to 850 nm; AD 1982 to 1993; Advanced Very High Resolution Radiometer; IR imaging; NDVI composite; NOAA AVHRR; calibration; channel 1; channel 2; desert targe; equipment; geophysical measurement technique; infrared imaging; instrument; land cover; land surface; normalized difference vegetation index; optical imaging; sensitivity; sensor degradation; terrain mapping; vegetation mapping; visible region; Biosensors; Calibration; Degradation; Monitoring; NASA; Radiometry; Satellite broadcasting; Sensor systems; Testing; Vegetation;
Journal_Title :
Geoscience and Remote Sensing, IEEE Transactions on
