Prairie Grass Canopy on May 7, 1999 (DOY 127)
Click Here to Get Grass Spectral Data for May 7, 1999
Click Here to go to the Sky Condition Figure
The data for both canopy reflected energy and reference panel has been smooth and resampled for every 5 nm from 400 to 1000 nm. The reference panel data has been corrected for its non-Lambertian properties. The cell lists the solar zenith angles (degrees) for each suite of measurements. A suite of measurements includes a beginning and ending reference panel measurements, 11 measurements in the principal plane of the sun (Backscatter to Forescatter: -75, -60, -45,-30,-15, 0, +15, +30,+45,+60,+75 degrees) and 11 measurements in a plane perpendicular to the principal plane of the sun (From the left to the right facing the sun: -75,-60,..,0,...+60,+75 degrees) File size varies depending on number of solar zenith angles measure and range from 48-126 Kb. Data format explanation.
Sky
Conditions: A graph of
photosynthetically active radiation (PAR) measurements in
and above the canopy. Incoming (I), Diffuse and Reflected (R) PAR were measured
with Li-Cor Quantum sensors. Transmitted (T) and Soil Reflected (SR) PAR were
measured with Li-Cor Line Quantum Sensors. Fraction of absorbed PAR (fAPAR) is calculated by
(I-R-T+SR)/I.
Listed in each cell is the Total Leaf Area Index (LAI) for the canopy or the
type of canopy that was on the soil. The yellow bars on the graph indicate
when bidirectional reflectance data was measured.
Photos:Listed above are links to a collection of photographs from the view of the SE590 along the principal plane and perpendicular to the principle plane of the sun for the 55 degree solar zenith angle and nadir photographs for each of the other solar zenith angles.