In
1990-1992, as a visiting research scientist at Earth-Observations Laboratory,
Institute of Space and Terrestrial Sciences, Ontario, Canada, I participated
the Oregon Transect Ecosystem Research Project led by NASA, USA. My major work was related to analyzing
the relationships between hyperspectral remote sensing data (CASI) and some
ecosystem parameters. Ecosystem
parameters were crown closure and leaf area index. Analysis techniques included spectral derivative and
multivariate regression analysis. Calibration
of imaging spectrometry data to reflectance using pseudo-invariant
features. Pseudo-invariant
features can be used to derive ground reflectances from at-sensor radiances
with useful accuracy for quantitative interpretation. In situ reflectance measurements of a number of
anthropogenic targets were taken using the SE590 spectrometer. A model used for correcting atmospheric
scattering and uncertainties in sensor radiometric calibration was developed
with the reflectances and radiances from ground and CASI images. The method is effective at removing
atmospheric absorption features and reduces the need for a radiometerically-calibrated
sensor.
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