I have 2 spectrometers calibrated for irradiation working between 350-1050 nm. I use these to measure simultaneous up-welling and down-welling irradiance measurements at various agricultural fields. One of the spectrometers is with a cosine corrector and mounted upwards for down-welling measurements while the other one uses bare fiber and mounted with 45 degrees facing downwards for up-welling measurements.
One of my aims is to generate agricultural indices such as NDVI. But I'm stuck in the process of generating reflectance values out of these irradiance measurements.
Dear Ayda in easy way the NDVI = (NIR- RED0/ (NIR+RED)
so you have to use the spectrum values for getting the NDVI inex and hence you had used a spectroradeometer so, you just need to normalized the measured reflectance value of vegetation.
my regards
it's again measure of SR from satellite images. Please read this thesis, you shall find a lot of help in methodology section of this manuscript.
Use 0.86 micrometer to 1.24 micrometer Radiance Better NDVI will be there
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