6 UNDERSTANDING DATA OUTPUTS SRS Sensors
down looking sensors are connected to different data loggers, you can
export tabular data as Excel files and manually combine α from the
up looking sensor with the spectral radiance values from the down
looking sensor to calculate NDVI or PRI.
6.2 Using other data loggers
When connected to non-Decagon data loggers (e.g., Campbell Sci-
entific) sensors will output the calibrated spectral irradiance or ra-
diance from each band and an orientation value from the tilt sensor.
Spectral irradiance and radiance are output as radiant fluxes (in W
m
−2
nm
−1
or W m
−2
nm
−1
sr
−1
) for the shorter and then the longer
wavelength sensor. Tilt sensor readings are output as a single value
between 0 and 2, with 0 indicating an indeterminate orientation, 1
indicating a down facing orientation, and 2 indicating an up facing
orientation. Additional information about using the SRS with non-
Decagon data loggers can be accessed at www.decagon.com/srs. For
additional information about connecting your SRS to non-Decagon
data loggers, see Section 4.3.
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