March 25, 1999 (DOY 084)
Click Here to Get Wheat Spectral Data for March 25, 1999Click 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, measurements at 11 view zenith angles in the principal plane of the sun
(Backscatter to Forescatter: -75, -60, -45,-30,-15, 0, +15, +30,+45,+60,+75
degrees) and measurements at 11 view zenith angles 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.
Click on a figure to enlarge the image.
| Solar Zenith Angle \ Orientation | 45o | 55o (Photos) |
| Parallel to the Principle Plane of the Sun |
 |
 |
| Perpendicular to the
Principle Plane of the Sun |
 |
 |
| Soil Nadir |
 |
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 55o solar zenith angle and nadir photographs for each of the other solar zenith angles.