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LI Jian CHEN Shengbo QIN Wenhan Mike MUREFU WANG Yufei YU Yan ZHEN Zhijun 《中国地理科学(英文版)》2019,(4):679-688
The Multi-angle imaging spectroradiometer(MISR) land-surface(LS) bidirectional reflectance factor(BRF) product(MILS_BRF) has unique semi-simultaneous multi-angle sampling and global coverage. However, unlike on-satellite observations, the spatio-temporal characteristics of MILS_BRF data have rarely been explicitly and comprehensively analysed. Results from 5-yr(2011–2015) of MILS_BRF dataset from a typical region in central Northeast Asia as the study area showed that the monthly area coverage as well as MILS_BRF data quantity varies significantly, from the highest in October(99.05%) through median in June/July(78.09%/75.21%) to lowest in January(18.97%), and a large data-vacant area exists in the study area during four consecutive winter months(December through March). The data-vacant area is mainly composed of crop lands and cropland/natural vegetation mosaic. The amount of data within the principal plane(PP)±30°(nPP) or cross PP ±30°(nCP), varies intra-annually with significant differences from different view zeniths or forward/backward scattering directions. For example, multiple off-nadir cameras have nPP but no nCP data for up to six months(September through February), with the opposite occurring in June and July. This study provides explicit and comprehensive information about the spatio-temporal characteristics of product coverage and observation geometry of MILS_BRF in the study area. Results provide required user reference information for MILS_BRF to evaluate performance of BRDF models or to compare with other satellite-derived BRF or albedo products. Comparing this final product to on-satellite observations, what was found here reveals a new perspective on product spatial coverage and observation geometry for multi-angle remote sensing. 相似文献
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无人机倾斜摄影技术研究与应用 总被引：1，自引：0，他引：1
针对无人机倾斜摄影系统选型设计、传感器配置和系统集成问题,该文按照倾斜摄影技术要求,通过分析各种类型无人机飞行平台的技术特点和性能指标,提出了不同场景下无人机系统设备的选型设计方法、多种倾斜摄影相机的合理配置方案、系统优化集成方法和数据处理技术流程,指出了无人机倾斜摄影技术目前存在的问题。该文研究成果为无人机倾斜摄影系统开发、设备研制及生产作业提供了重要参考,已研发出固定翼无人机、多旋翼无人机为飞行平台的多种规格型号的无人机倾斜摄影设备,提高了作业效率。 相似文献
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数字武汉地理空间信息共享平台的研究 总被引：2，自引：1，他引：1
介绍了数字武汉地理空间信息共享平台的构建,它集成了武汉市多源、多尺度、多时态的空间数据,实现了跨部门、跨平台的空间信息的共享共用,分析了共享平台建设的社会效益和经济效益。 相似文献
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吉林省地矿局通过抓好探矿装备的配套,加强生产与技术的管理和坚定不移地依靠技术进步,钻探生产水平大幅度地提高,取得了明显的技术经济效益。 相似文献
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本文首先分析了传统的垂直测量方法在定量遥感中的局限性及多角度倾斜光谱在估算地物三维空间结构等方面的优越性。通过总结近年来国际上在植被双向反射领域所取得的主要成果,对计算植被双向反射系数的四类物理模型进行了简要评述。然后,从模式的选取、地物方向谱的结构及最佳的多角度资料的获取、观测波段的选择和模式的数学反演等方面出发,详细地讨论了利用上述理论模型实现植被结构参数的定量估算、再生资源的定量遥感的主要过程,以及使多角度遥感的潜在优势得以真正实现的可能途径。 相似文献
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新疆天山地区的铀矿化往往集中分布于某一区段,而该区段的矿化类型基本相同,显然,这是受同一地质成矿作用控制的结果。通过卫星遥感图象的地质解译和野外调研,并对某些铀矿化较为集中的子区进行计算机数字图象处理,发现了一些以往一般地质方法不易得到的控矿规律方面的信息。通过对4个铀矿化区的分析认为,在地台、地槽过渡区的区域构造线方向变异部位,并有老地层(An(?))构成的环形构造出现的地段,是寻找沉积-改造型铀矿化的有利地区。而寻找后生作用为主的铀矿化,则需着重研究盆地边缘地质构造及地貌的特点。在处理图象时,以多功能联合处理的效果为优。 相似文献
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Relocation of the Yellow River estuary in 1855 AD recorded in the sediment core from the northern Yellow Sea 总被引：1，自引：1，他引：0
Relocation of the Yellow River estuary has significant impacts on not only terrestrial environment and human activities, but also sedimentary and ecological environments in coastal seas. The responses of regional geochemical characteristics to the relocation event, however, have not been well studied. In the present study, we performed detailed geochemical elemental analyses of a sediment core from the northern Yellow Sea and studied their geochemical responses to the 1855 AD relocation of the Yellow River estuary. The results show that TOC/TN, Co/Al2O3, Cr/Al2O3, Ni/Al2O3 and Se/Al2O3 ratios all decreased abruptly after 1855 AD, and similar decreases are observed in the sediments of the mud area southwest off the Cheju Island. These abrupt changes are very likely caused by the changes in source materials due to the relocation of the Yellow River estuary from the southern Yellow Sea to the Bohai Sea, which the corresponding decreasing trends caused by the changes in main source materials from those transported by the Liaohe River, the Haihe River and the Luanhe River to those by the Yellow River. Because the events have precise ages recorded in historical archives, these obvious changes in elemental geochemistry of sediments can be used to calibrate age models of related coastal sea sediments. 相似文献
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高新技术在高速公路工程可行性研究中的应用 总被引：1，自引：0，他引：1
本文重点论述了运用3S等高新技术对高速公路工程可行性的分析和应用实例,研究表明这是一经济有效的技术途径。 相似文献
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