Remote sensing of solar radiation absorbed and reflected byvegetated land surfaces
Myneni, R.B.; Asrar, G.; Tanre, D.; Choudhury, B.J.
Geoscience and Remote Sensing, IEEE Transactions on
Volume 30, Issue 2, Mar 1992 Page(s):302 - 314
Digital Object Identifier 10.1109/36.134080
Summary:The problem of remotely sensing the amount of solar radiation
absorbed and reflected by vegetated land surfaces was investigated with
the aid of one- and three-dimensional radiative transfer models. Desert
vegetation was modeled as clumps of leaves randomly distributed on a
bright dry soil with a ground cover of generally less than 100%. Surface
albedo (ALB), fraction of photosynthetically active radiation absorbed
by the canopy (FAPAR), fractions of solar radiation absorbed by the
canopy (FASOLAR) and soil (FASOIL), and normalized difference vegetation
index (NDVI) were calculated for various illumination conditions. The
magnitude of errors involved in the estimation of surface albedo from
broadband monodirectional measurements was assessed. The nature of the
relationships between NDVI vs. FASOLAR, FAPAR, FASOIL, and ALB and their
sensitivity to all problem parameters were investigated in order to
develop simple predictive models. The relationship between NDVI measured
above the atmosphere and that sensed above the canopy at the ground
surface was studied to characterize atmospheric effects
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