In this paper, we described the development of a low cost,
small, lightweight hyperspectral sensor system that can be
loaded onto small UAV platforms. Through the use of lightweight
and autonomous cruising, safe and easy observation is
possible under unstable illumination conditions. The experimental
results demonstrate that chlorophyll densities can be
estimated with high accuracy, even under unstable illumination
conditions, by frequent monitoring of the illumination level
and the chlorophyll indices at the RE and NIR spectral ranges