In-situ crop hyperspectral acquiring and spectral features analysis based on pushbroom imaging spectrometer

In order to validate the feasibility of self-developed pushbroom imaging spectrometer (PIS) for near ground application, PIS was used to acquire the hyperspectral information of wheat and corn at canopy and leaf scales. The hyperspectral data were collected from field and laboratory respectively and were compared with each other, and the affect factors that appeared in the collection of PIS imaging were also analyzed. In addition, the hyperspectral images were compared with the spectra that obtained from classical field spectroradiometers (ASD Fieldspec FR2500, ASD). The results showed that PIS data had good consistency with ASD data, and PIS could accurately obtain spectral information of crops. Due to the influence of the absorption of oxygen, the spectra obtained by PIS had disturbance absorption at 760 nm. Meanwhile, PIS could not only analyze the effect degree of weed and soil background for crop canopy spectra, but also extract spectral differences among leaves from different layers and organs. These preliminary results provide a foundation for further application of PIS on monitoring crop growth status.