Using the PROSAIL radiation transfer model and HJ-1A-HSI data to simulate the canopy reflectivity of apple trees, this study lays the foundation for the inversion of canopy parameters. Taking Qixia City of Yantai City...Using the PROSAIL radiation transfer model and HJ-1A-HSI data to simulate the canopy reflectivity of apple trees, this study lays the foundation for the inversion of canopy parameters. Taking Qixia City of Yantai City, Shandong Province as the research area, the apple tree was taken as the research object, and the hyperspectral reflectance, LAI and sample GPS of apple canopy were measured in the field. The parameters required for the PROSAIL model were obtained by experimental methods. The model simulates the reflectivity;the HSI image data is preprocessed, and the canopy reflectivity is extracted by GPS coordinates. The PROSAIL model and the HSI image simulated reflectance were fitted to the measured apple canopy reflectivity. The decisive factor (R2) of the simulated reflectance and the measured reflectance of the PROSAIL model was 0.9944, and the relative error (RE%)was 0.1845. The HSI data simulated reflectance and measured reflectance. The coefficient of determination is 0.9714 and the relative error is 0.6202. Both have achieved good fitting effects and can be used for inversion studies of apple canopy parameters.展开更多
基于HJ-1A卫星HSI数据,以阿克苏地区主栽3种经济林树种为研究对象,运用最佳指数法(Optimum Index Factor)和波段指数法(Band Index)对HJ-1A卫星的HSI影像进行敏感波段的筛选,并对南疆环塔里木盆地主栽经济林树种进行了识别研究。结果表...基于HJ-1A卫星HSI数据,以阿克苏地区主栽3种经济林树种为研究对象,运用最佳指数法(Optimum Index Factor)和波段指数法(Band Index)对HJ-1A卫星的HSI影像进行敏感波段的筛选,并对南疆环塔里木盆地主栽经济林树种进行了识别研究。结果表明,不同波段选择方法筛选出的敏感波段集中在红光和近红外波段范围,且对经济林树种都具有良好的可分性;敏感波段组合(28-40-77、28-54-75、20-40-58)对经济林树种总分类精度均达到了70%以上,基于TM432划分波段的波段指数法筛选的20-40-58组合,总分类精度最高(OA=72.4647%),Kappa系数为0.5838。展开更多
The calibration experiment data at Dunhuang radiometric calibration site in October, 2008 were used to achieve the on-orbit radiometric calibration for HJ-1A hyper spectral imager (HSI). Two other field experiments da...The calibration experiment data at Dunhuang radiometric calibration site in October, 2008 were used to achieve the on-orbit radiometric calibration for HJ-1A hyper spectral imager (HSI). Two other field experiments data were used to validate the Dunhuang calibration results. One field experiment took place in Inner-Mongolia, China in September, 2008, and the other field experiment took place in Lake Frome, Australia in February, 2009. Finally, the ‘confidence interval of calibration error’ concept was put forward for quantitatively computing the calibration coefficient error confidence interval. The results showed that the Dunhuang calibration results in 2008 had high reliability. The confidence intervals of calibration error for all HSI channels were between 2% to 12%, which could satisfy the requirement of the HSI quantitative applications.展开更多
基金the National Natural Science Foundation of China(41671346)National Key Research and Development Program of China (2017YFE0122500)+2 种基金the Taishan Scholar Assistance Program from Shandong Provincial GovernmentFunds of Shandong “Double Tops” Program(SYL2017XTTD02)Shandong major scientific and technological innovation project: Research demonstration and extension of orchard irrigation and fertilization in accurate management(2018CXGC0209).
文摘Using the PROSAIL radiation transfer model and HJ-1A-HSI data to simulate the canopy reflectivity of apple trees, this study lays the foundation for the inversion of canopy parameters. Taking Qixia City of Yantai City, Shandong Province as the research area, the apple tree was taken as the research object, and the hyperspectral reflectance, LAI and sample GPS of apple canopy were measured in the field. The parameters required for the PROSAIL model were obtained by experimental methods. The model simulates the reflectivity;the HSI image data is preprocessed, and the canopy reflectivity is extracted by GPS coordinates. The PROSAIL model and the HSI image simulated reflectance were fitted to the measured apple canopy reflectivity. The decisive factor (R2) of the simulated reflectance and the measured reflectance of the PROSAIL model was 0.9944, and the relative error (RE%)was 0.1845. The HSI data simulated reflectance and measured reflectance. The coefficient of determination is 0.9714 and the relative error is 0.6202. Both have achieved good fitting effects and can be used for inversion studies of apple canopy parameters.
文摘基于HJ-1A卫星HSI数据,以阿克苏地区主栽3种经济林树种为研究对象,运用最佳指数法(Optimum Index Factor)和波段指数法(Band Index)对HJ-1A卫星的HSI影像进行敏感波段的筛选,并对南疆环塔里木盆地主栽经济林树种进行了识别研究。结果表明,不同波段选择方法筛选出的敏感波段集中在红光和近红外波段范围,且对经济林树种都具有良好的可分性;敏感波段组合(28-40-77、28-54-75、20-40-58)对经济林树种总分类精度均达到了70%以上,基于TM432划分波段的波段指数法筛选的20-40-58组合,总分类精度最高(OA=72.4647%),Kappa系数为0.5838。
基金supported by the International Science and Technology Cooperation Program of China (Grant No 2008DFA21540)the Chinese Defence Advance Research Program of Science and Technology (Grant No 07K00100KJ) the National Hi-Tech Research and Development Pro-gram of China ("863" Project)
文摘The calibration experiment data at Dunhuang radiometric calibration site in October, 2008 were used to achieve the on-orbit radiometric calibration for HJ-1A hyper spectral imager (HSI). Two other field experiments data were used to validate the Dunhuang calibration results. One field experiment took place in Inner-Mongolia, China in September, 2008, and the other field experiment took place in Lake Frome, Australia in February, 2009. Finally, the ‘confidence interval of calibration error’ concept was put forward for quantitatively computing the calibration coefficient error confidence interval. The results showed that the Dunhuang calibration results in 2008 had high reliability. The confidence intervals of calibration error for all HSI channels were between 2% to 12%, which could satisfy the requirement of the HSI quantitative applications.
