Apogee Instruments S2-411 Manuale d'uso - Pagina 7

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Cosine Response

Upward- and Downward-looking Two-band Sensors

Directional, or cosine, response is defined as

the measurement error at a specific angle of

radiation incidence. Error for Apogee S2

series NDVI sensors is approximately ± 2 %

and ± 5 % at solar zenith angles of 45° and

75°, respectively.

Upward (model S2-411)

Downward (model S2-412)