To extract quantitative biophysical parameters such as leaf biomass and leaf chlorophyll concentration from the remotely sensed imagery, the effect of atmospheric attenuation must be removed. The refined empirical li...To extract quantitative biophysical parameters such as leaf biomass and leaf chlorophyll concentration from the remotely sensed imagery, the effect of atmospheric attenuation must be removed. The refined empirical line (REL) method was used to calibrate the IKONOS multispectral imagery. The IKONOS digital numbers (DN) were converted to the at-satellite reflectance, then the linear relation between at-satellite reflectance and surface spectral reflectance (ρA) was derived from six bright targets of known reflectance in the image, and modelled estimates of the image reflectance at ρA=0. Validation targets were used to test the feasibility of REL method. The mean relative errors between ρA retrieved from IKONOS image using REL method and ground-measured ρA were 11%, 13%, 3% and 5% in the IKONOS blue, green, red and near-infrared (NIR) respectively. When dark targets are unavailable or measurement of dark target is inconvenient, the REL method was most crucial for retrieving surface spectral reflectance. The REL offers a simple approach for quantitative retrieval of biophysical parameters from IKONOS imagery.展开更多
This paper introduces a sliding-window mean removal high pass filter by which background clutter of infrared multispectral image is obtained. The method of selecting the optimum size of the sliding-window is based on ...This paper introduces a sliding-window mean removal high pass filter by which background clutter of infrared multispectral image is obtained. The method of selecting the optimum size of the sliding-window is based on the skewness-kurtosis test. In the end, a multivariate Gaussian distribution mathematical expression of background clutter image is given.展开更多
SPIE-Vol.3543 00188961998年 SPIE 会议录.卷3543:精确农业与生物品质= 1998 proceedings of SPIE,Vol.3543:precision agricul-ture and biological quality[会,英]/SPIE-the Internation-al Society for Optical Engineering.—1998....SPIE-Vol.3543 00188961998年 SPIE 会议录.卷3543:精确农业与生物品质= 1998 proceedings of SPIE,Vol.3543:precision agricul-ture and biological quality[会,英]/SPIE-the Internation-al Society for Optical Engineering.—1998.—390P.(PC)本会议录收集了于1998年11月3~4日在美国麻州波斯顿召开的精确农业与生物品质专题讨论会上发表的44篇论文。内容涉及农业与生物系统用的光谱测定法和传感系统.生物制品分类与内部检查用的成象技术,谷类产品质量评估用的成象法。以及多谱成象应用等。展开更多
基金Project supported by the Hi-Tech Research and Development Pro-gram (863) of China (Nos. 2002AA130010-2-7 and 2003AA131020- 04-06) and the National Natural Science Foundation of China (No. 40171065)
文摘To extract quantitative biophysical parameters such as leaf biomass and leaf chlorophyll concentration from the remotely sensed imagery, the effect of atmospheric attenuation must be removed. The refined empirical line (REL) method was used to calibrate the IKONOS multispectral imagery. The IKONOS digital numbers (DN) were converted to the at-satellite reflectance, then the linear relation between at-satellite reflectance and surface spectral reflectance (ρA) was derived from six bright targets of known reflectance in the image, and modelled estimates of the image reflectance at ρA=0. Validation targets were used to test the feasibility of REL method. The mean relative errors between ρA retrieved from IKONOS image using REL method and ground-measured ρA were 11%, 13%, 3% and 5% in the IKONOS blue, green, red and near-infrared (NIR) respectively. When dark targets are unavailable or measurement of dark target is inconvenient, the REL method was most crucial for retrieving surface spectral reflectance. The REL offers a simple approach for quantitative retrieval of biophysical parameters from IKONOS imagery.
文摘This paper introduces a sliding-window mean removal high pass filter by which background clutter of infrared multispectral image is obtained. The method of selecting the optimum size of the sliding-window is based on the skewness-kurtosis test. In the end, a multivariate Gaussian distribution mathematical expression of background clutter image is given.
文摘Y98-61446-103 9914548RAMOS(俄美观测卫星)与支援联合试验=RAMOS(Russian American observation satellites) and supportingjoint experiments[会,英]/Stair,A.T.& Carpenter,J.//1998 IEEE Aerospace Conference Proceedings,Vol.5 of 5.—103~113(PV)
文摘SPIE-Vol.3543 00188961998年 SPIE 会议录.卷3543:精确农业与生物品质= 1998 proceedings of SPIE,Vol.3543:precision agricul-ture and biological quality[会,英]/SPIE-the Internation-al Society for Optical Engineering.—1998.—390P.(PC)本会议录收集了于1998年11月3~4日在美国麻州波斯顿召开的精确农业与生物品质专题讨论会上发表的44篇论文。内容涉及农业与生物系统用的光谱测定法和传感系统.生物制品分类与内部检查用的成象技术,谷类产品质量评估用的成象法。以及多谱成象应用等。