Study of a Vegetation Index Based on HJ CCD Data's top-of-atmosphere reflectance and FPAR Inversion

35th International Symposium on Remote Sensing of Environment

地球科学;生态环境科学

Dong, Taifeng^1 ; Wu, Bingfang^1 ; Meng, Jihua^1

Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, 100101, China^1

关键词: Atmospheric corrections;    Atmospheric effects;    Fraction of photosynthetically active radiations;    Inversion algorithm;    Near infrared spectral;    Optical remote sensing data;    Radiative transfer model;    Top of atmospheres;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/17/1/012029/pdf
DOI  :  10.1088/1755-1315/17/1/012029

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The Fraction of Photosynthetically Active Radiation (FPAR)absorbed by plant canopies is a key parameter for monitoring crop condition and estimating crop yield. In general, it is necessary to obtain Top of Canopy (TOC) reflectance from optical remote sensing data in digital number through atmospheric correction procedures before retrieving FPAR. However, there are a few of uncertainties that existe in the process of atmosphere correction and reduced the quality of TOC. This paper presents a vegetation index based on Top-of-Atmosphere (TOA) reflectance derived from HJ-1 CCD satellite for estimating direct crop FPAR. The vegetation index (HJVI) was designed based on the simulated results of a canopy-atmosphere radiative transfer model, including TOA reflectance and corresponded FPAR. The HJVI had taken the advantages of information in the green, the red and the near-infrared spectral domainswith with a aim of reducing the atmospheric effect and enhancing the sensitive to green vegetation. The HJVI was used to estimate soybean FPAR directly and validated using field measurements. The result indicated that the inversion algorithm produced a good relationship between the prediction and measurement (R20.546, RMSE 0.083) and the HJVI showed high potential for estimating FPAR based on the HJ-1 TOA reflectance directly.