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A Preliminary Global Analysis of Remotely Sensed Radiation Characteristics of Ground Features:Ⅱ. Result Discussion 被引量:3
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作者 ZENG ZHI-YUANInstitute of Soil Science, A cademia Sinica, P. O. Box 821, Nanjing 210008 ( China) 《Pedosphere》 SCIE CAS CSCD 1991年第4期301-313,共13页
Based on the L,B and V statistics of the 106 ground feature groups or the 769 ground feature class units in the world presented in the part I of the paper,the distribution of the world ground features on the axes of L... Based on the L,B and V statistics of the 106 ground feature groups or the 769 ground feature class units in the world presented in the part I of the paper,the distribution of the world ground features on the axes of L,B and V,in the planes of L-B,L-V and B-V and in the space of L-B-V was discussed.And the typical numerical characteristics of the various ground features were also summarized. 展开更多
关键词 global analysis ground features radiance variation radiation curve radiative property
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Primary safe criterion of earth-brushing flight for flying vehicle over digital surface model
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作者 赵敏 林行刚 赵乃国 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2004年第3期309-314,共6页
In modern terrain-following guidance it is an important index for flight vehicle to cruise about safely and normally. On the basis of a constructing method of digital surface model (DSM), the definition, classificatio... In modern terrain-following guidance it is an important index for flight vehicle to cruise about safely and normally. On the basis of a constructing method of digital surface model (DSM), the definition, classification and scale analysis of an isolated obstacle threatening flight safety of terrain-following guidance are made. When the interval of vertical-and cross-sections on DSM is 12. 5 m, the proportion of isolated obstacles to the data amount of DSM model to be loaded is optimal. The main factors influencing the lowest flying height in terrain-following guidance are analyzed, and a primary safe criterion of the lowest flying height over DSM model is proposed. According to their test errors, the lowest flying height over 1:10 000 DSM model can reach 40. 5 m^45. 0 m in terrain-following guidance. It is shown from the simulation results of a typical urban district that the proposed models and methods are reasonable and feasible. 展开更多
关键词 digital surface model terrain-following guidance flight obstacle ground feature flight vehicle.
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