The camparison of citrus canopy spectral characteristics obtained by the HJ-1A/ HSI and ASD field spectrometer

The purpose of this paper is to get the difference of citrus spectral characteristics between HSI image from HJ-1A satellite and ASD field spectrometer. The HSI image is treated with the process of Absolute Value Conversion, Strip Removal, Flaash Correction and Geometric Correction, then the citrus spectral reflectance is inversed by the treated HSI image. The comparison results show that the citrus spectral reflectance of two data is significantly different,especially in red and near-infrared light. The absorption and reflection characteristics of ASD is more obvious than HSI. The spectral variables of two data is also different, which is caused by the SDy. So the ASD data is more accurate than the HSI, but if the quality of HSI is improved, the HSI data is able to used for inversion vegetation index in large scale.