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分别从海雾、海上强对流、海洋环境监测角度,介绍了卫星遥感监测能力、方法和相关产品的最新进展。卫星监测能力上,发展方向主要为高低轨、主被动协同观测;数据提取和产品反演方面,遥感反演算法趋于多样化且逐渐稳定成熟。基于卫星遥感对高层大气(以强对流为代表)、边界层大气(以海雾为代表)以及海洋环境(以海洋藻类、水体组分参数为代表)的评估,已经从科学研究过渡到业务监测,进一步提升了对海洋大气和生态环境的监测能力。 相似文献
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高分系列卫星的成功研发、发射和应用标志着我国遥感技术与卫星工程发展的再次飞跃,标志着我国卫星遥感能力的国际影响力进一步得到提升。高分系列卫星极大丰富了我国自主对地观测的数据源,为国产高分遥感数据的应用提供了有力保障。鉴于此,本文依据近年来大量相关文献对已发射的高分系列卫星,从卫星概况、卫星特征与应用等方面进行总结概述与分析。最后对高分系列卫星的发展与应用作出了展望。 相似文献
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根据对卫星遥感领域中雷达成像类型传感器进行专利检索与分析,旨在对我国卫星遥感领域的发展,提供参考价值。文中着重从卫星遥感领域世界机构排名情况、中国机构排名情况、主要技术热点、专利全球分布情况四方面对雷达成像传感器进行专利分析。又将中国专利权人按照地域进行划分,通过对比各省份专利拥有量,找出优势省份与专利空缺省份,利于明确今后发展方向。 相似文献
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针对目前从遥感影像中提取的河流, 尤其是细小河流容易出现中断的情况, 将深度学习与多次棋盘分割法相结合, 应用于高分辨率遥感影像的河流提取。基于对山区、平原和城市3景高分二号卫星遥感影像的实验表明, 与现有的方法相比, 该方法提取的河流更加连续, 并且能够提取高分二号卫星遥感影像中两个像元的细小河流。 相似文献
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"航天员从地球低轨道上裸眼能否看到长城",这个问题引起广泛关注和争论。争论焦点涉及如何正确认识人眼视觉原理等问题。应用国内外出版物中公开介绍的目视方面的军事科技理论和计算公式,从人眼视觉阈、视角阈等基本概念入手,通过理论分析、计算与实验,最终验证了"航天员从地球低轨道上裸眼看到过长城"的事实。 相似文献
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从兵学的角度看,齐长城是齐国兵家防御至上军事理论指导下兴建的军事防御工程,它的兴建有一个由局部性的战术工程到全局性的战略工程的转变的过程。齐长城的防御战略有两大特点,即:山地防御、济水防御、黄海防御三位一体的防御战略;积极的长城防御战略。齐长城在保障齐国国防安全方面发挥过应有的作用。 相似文献
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长城是著名的世界文化遗产。近年来北京市文物局提出了长城文化带保护建设工作,且因水作为多孔材料青砖耐久性能的主要影响因素,其携带的侵蚀性介质会对青砖造成严重破坏,故需对长城主要承重材料-青砖的毛细吸水性进行研究。通过单面吸水法和卡斯特瓶法分别检测青砖的毛细吸水系数,发现卡斯特瓶法误差主要来源于水压影响和读数延迟;研究并建立了两种检测方法测试结果的关系方程或比例系数,可应用于不可取样长城青砖现场测试的毛细吸水系数转换为实际的毛细吸水系数的推算工作。此外,分析评估了环境温度、初始含水率、孔隙率和孔径4个主要因素对青砖毛细吸水性的影响,发现温度、孔隙率及孔径对毛细吸水性影响较大;且呈正相关关系,初始含水率则影响不大。 相似文献
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针对灰度图像提出了一种有效的人脸检测算法。首先对原始灰度图像利用Sobel边缘检测算子得到水平方向的梯度信息;在此基础上,结合人的眼睛灰度信息得到眼睛的初步候选区域,并根据眼睛的几何特征删除非眼睛区域;然后利用眼睛的几何特征以及人脸的“三停五眼”特性确定真正的眼睛和嘴的区域,在精确定位眼睛和嘴的几何位置后确定人脸区域;最后利用人脸的左右对称性来验证人脸。实验表明,该算法对于灰度图像的正面人脸定位以及人脸检测具有良好的效果。 相似文献
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宁夏素有“长城博物馆”、“长城之乡”之称,三关口明长城作为宁夏特色旅游资源,一直处于养在深闺无人知的状态,尚未发挥“无烟工业”的积极作用。文章应用层次分析法,评价宁夏三关口明长城旅游资源质量,分析其开发条件,并提出其旅游开发和保护对策。 相似文献
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河北是一个名副其实的长城大省,境内长城在全国占有极其重要的地位,当今世界文化旅游蓬勃兴起,为河北省长城文化旅游提供了巨大的机遇,正视河北长城资源特色,合理开发长城文化资源,打响河北牌长城是河北省旅游发展的一个重要方面。 相似文献
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Jun Chen ShuPing Jin AnPing Liao YouSong Zhao HongWei Zhang DaWei Rong ZhaoJun Yang 《科学通报(英文版)》2010,55(21):2290-2294
Listed by UNESCO in 1987 as a World Heritage site, the world-famous Ming Great Wall stretches several thousands of kilometers across northern China, and served as a massive military defensive system which in recent times has a unique historical, artistic and scientific value. Due to historical reasons and lack of advanced technologies, construction resources and conservation status of Ming Great Wall have not been investigated in any systematic manner; indeed, the extent of the Great Wall has not even been measured. This has resulted in a shortage of reliable first-hand scientific information on actual size, spatially resource distribution and preservation status of this World Heritage site. Driven by the urgent need to establish protection, research, renovation and management of Ming Great Wall, a comprehensive investigation and spatial mapping was jointly organized and completed by the State Bureau of Survey and Mapping and State Administration of Culture Heritage. High resolution digital stereo models at 1:10000 map scale covering the whole length of the Ming Great Wall have been created by photogrammetric reconstruction using nearly ten thousand aerial images. Spatial distribution and attributes of the wall sections, trenches and various subsidiary facilities in the surroundings of the Great Wall were measured with the help of digital photogrammetry workstations and results from field studies. Reliable and precise information about the Ming Great Wall has now been obtained and documented, including surface lengths, resource distribution, and preservation status. For example, the total length of Ming Great Wall is 8851.8 km, of which 6259.6 km is of actual wall, 2232.5 km of natural terrain, and 359.7 km of trenches. In category lengths, 1828.8 km is constructed of stone, 3411.3 km of earth, 249.6 km in brick, 197.5 km of cliff wall and the rest 572.4 km of other means. Such information provides the scientific basis and strong platform in helping to delineate areas needing protection, in planning conservation and renovation programs, as well as digital archiving for posterity and web-based applications for modern promotions of one of the world’s great attractions, the Ming Great Wall. 相似文献
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据考古荻见齐境兵器出土区域与铭刻所涉地名,宏观勾划出齐国武库防御格局;再藉长城与武库之相应关系,显现齐之长城在其军事防御格局中处于极重要地位。 相似文献
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齐长城是齐文化的重要栽体和外在表现形式,齐长城研究是对齐文化研究的丰富和发展。以古老齐长城为栽体研究齐文化,有着深远的现实意义。特别是对现代政治军事文化等方面的发展,尤具有启迪作用。 相似文献
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YingMing Li DaWei Geng YongBiao Hu Pu Wang QingHua Zhang GuiBin Jiang 《科学通报(英文版)》2012,57(13):1499-1503
Antarctica is an important research region for assessing persistence and long-range atmospheric transport (LRAT) of persistent organic pollutants (POPs). In this study, XAD-resin passive air sampling was conducted near the Chinese Great Wall Station, Antarctica, during a one-year sampling period in 2009-2010. The air concentrations of polychlorinated biphenyls (PCBs) were at a very low level, with total PCBs in the range of 26.74-45.08 pg m 3. PCB profiles were dominated by tetra-PCBs, tri-PCBs and di-PCBs, indicating LRAT was responsible for the pollutants in the Antarctic atmosphere. The sampling site near the Chinese Great Wall Station did not show higher PCB levels than the other sites, suggesting that PCB sources associated with the Great Wall Station were negligible. PCB-11 is a non-Aroclor congener, which has specific sources compared to other Aroclor PCB congeners. PCB-11 was observed in all air samples, with an average concentration of 1.22 pg m 3. To our knowledge, this study is the first investigation of PCB levels and distribution in the atmosphere around the Chinese Great Wall Station, Antarctica. 相似文献