基于三线阵CCD影像的DEM自动生成技术     

王建荣 李晶王新义  杨俊峰 《测绘科学与工程》2007,27(2):14-16,29

三线阵CCD相机是目前传输型航天摄影测量中的主要传感器之一。本文首先从影像匹配入手，提出了基于准正射影像、结合“断面引导逼近”原理进行三线阵CCD影像DEM（数字高程模型）自动生成的新思路，并通过实验验证了该思路的正确性和可行性。  相似文献   

宝鸡市金渭两区土地利用信息遥感提取研究   总被引：1，自引：1，他引：1  

徐春迪  屈康庆  郭俊理 《地理空间信息》2007,5(6):39-41

通过宝鸡市金渭两区利用TM遥感图像,采用最大似然分类法,进行土地利用分类的实践,对图像类型与时相的选择、图像处理、监督分类和分类体系进行了研究,并对分类精度进行了评价。  相似文献   

晋中近49年气候变化特征及对水资源的影响   总被引：7，自引：0，他引：7  

马荣田  周雅清  朱俊峰  郭彩萍  陈红萍 《气象》2007,33(1):107-111

利用晋中市近49年的气候和水资源等资料，对气温、降水的变化特征以及由此引起的水资源量的变化进行了统计分析。结果表明：年平均气温整体呈上升趋势，平均以0．3℃／10年速率上升，气温偏高主要是冬季，夏季变化幅度不大。降水量的变化呈减少趋势，以35．9mm／10年的速度在递减，1990年代是降水量减少幅度最大的时期；水资源总量、地下水、河川径流量呈减少趋势，与降水的变化具有明显的一致性。  相似文献   

《宁夏回族自治区资源环境地图集》的设计与编辑     

屈彦 《测绘与空间地理信息》2007,30(3):182-184

重点探讨《宁夏回族自治区资源环境地图集》编制设计的必要性、原则、特点及方法。  相似文献   

伪随机脉冲估计及其在简化动力学定轨中的应用     

韩保民  朱秀英  柳林涛  曲国庆 《武汉大学学报(信息科学版)》2007,32(5):466-469

研究了简化动力学定轨方法中伪随机脉冲的定义、特征及估计的数学模型。结合CHAMP星栽GPS实测数据，讨论了不同力学模型及观测值情况下的随机脉冲的估计，并分析了随机脉冲在不同情形下的大小变化及其对定轨精度的调节作用。结果表明，随机脉冲的大小和使用的力学模型、是否估计经验参数及使用的观测值精度有关系。在力学模型误差较大的情况下，随机脉冲的设置能有效地补偿和吸收模型误差，从而提高定轨精度。  相似文献   

河西走廊一次突发性暴雨天气的诊断分析   总被引：2，自引：0，他引：2  

滕水昌  渠永兴  王坚  李伯文  张弿  王荣哲 《干旱气象》2007,23(3):66-71

对2006年7月14日发生在甘肃省永昌县南部山区的局地强暴雨从天气学、物理量场、水汽条件、降水强度、卫星和雷达特征等方面进行了综合分析,发现500 hPa气旋式风切变是局地强降水形成的主要形势诱发因子,风的垂直切变为上升运动的维持提供了有利条件,有利于对流的产生和发展;由涡旋云系外部气流引发的对流单体,造成了这次局地强对流降水。同时发现高能区和S i场的分析对强对流天气的预测有良好的指示作用。  相似文献   

The Sequence Architecture of Volcanic Basin Fillings- An Example From Xujiaweizi Faulted Depression In Songliao Basin     

Cheng Rihui  LIU Wanzhu  SHAN Xuanlong  WANG Pujun  CHEN Shumin  QU Yongbao 《世界地质(英文版)》2001,4(2)

The basin filling geometric pattern of volcanic eruptive rocks depends on both of the eruptive locations in a basin and structural styles of fault terraces. It is divided into three types by eruptive locations and occurrences of eruptive rocks, including the pattern of eruption along fault and occurrence (PEAFO), the pattern of eruption on footwall of a fault and occurrence (PEOFO) and the pattern of eruption on hangingwall of fault and occurrence (PEOHO) in Xujiaweizi fault depression of Songliao basin, Northeast of China. Those basin filling patterns of volcanic eruptive rocks are of specific geometric characteristics controlling or affecting sedimentation, geometry of sedimentary body and sequence architecture during a sequence evolution. The study shows that the volcanic rocks developed at different stages of lowstand, transgressive and highstand can give different controls or affects on the sequence architecture.  相似文献   

Simulating the impacts of climate variation and land-cover changes on basin hydrology: A case study of the Suomo basin   总被引：3，自引：0，他引：3  

CHEN Junfeng    LI Xiubin & ZHANG Ming . Institute of Remote Sensing & GIS  Peking University  Beijing  China  . Institute of Geographical Sciences  Natural Resources Research  Chinese Academy of Sciences  Beijing  China 《中国科学D辑(英文版)》2005,48(9):1501-1509

1 Motivation In the summer of 1998, areas along the middle and lower reaches of the Yangtze River suffered a damag- ing flood. Causes of the flooding became a hot topic on mass media after the disaster. Deforestation on the upstream areas was widely blamed as the major reason for the flooding. Some scientists, however, disproved the point of view. They believed that the impact of land use and land cover changes (LUCC) was over- stated[1]. Actually, the controversy over forest hydrol- ogy h…  相似文献   

Zr/Rb ratio in the Chinese loess sequences and its implication for changes in the East Asian winter monsoon strength   总被引：2，自引：0，他引：2  

Jun Chen  Yang Chen  Junfeng Ji  Youbin Sun 《Geochimica et cosmochimica acta》2006,70(6):1471-1482

The long-term dust accumulation sequences on the Chinese Loess Plateau (CLP) provide a valuable opportunity to study the evolution of East Asian winter monsoon strength. Grain size of bulk samples of loess deposits, though widely used, is a modified measure of the strength of winter monsoon wind due to modification by post-depositional weathering and pedogenesis. This study proposes a new and reliable geochemical climate proxy that records the variability of the East Asian winter monsoon on the CLP. Six loess-paleosol sections on the Plateau were selected for measuring concentrations of the trace elements Zr and Rb as well as grain size. Variations of the Zr/Rb ratio in all the sections encompassing the last 130 ka display a generally similar pattern to that of mean grain size of bulk samples (MGSB). Though a positive correlation exists between the Zr/Rb ratio and MGSB, the correlation coefficient decreases in southern and eastern sections where intense pedogenesis occurred in the relatively warm and humid climates. Long-term Zr/Rb variation in the Lingtai section exhibits amplitudes and frequencies similar to those in MGSB and the mean grain size of quartz particles (MGSQ, accepted as a more reliable proxy than MGSB) in the upper loess-paleosol sequence over the past 2.6 Ma. However, for the underlying Red Clay formation, in the interval from about 7-2.6 Ma B.P., the MGSB record is relatively stable, whereas both the Zr/Rb ratio and MGSQ show distinct variability and display amplitudes similar to those observed in the overlying loess-paleosol sequence. These results demonstrate that the Zr/Rb ratio reflects original eolian grain size and may serve as a reliable index of the strength of East Asian winter monsoon winds.  相似文献   

Regional fractures and denudation of gold ore deposits in Gangdise block,Tibet: Evidence of Ag/Au values     

Li  Shengrong  Deng  Jun  Hou  Zengqian  Xiao  Run  Yuan  Wanming  Feng  Xiaoliang  Zhao  Zhidan  Shen  Junfeng  Zhou  Su 《中国科学:地球科学(英文版)》2001,44(1):121-127

Mapping with Ag/Au ratios of mineralized rocks and ores as a parameter reveals that the deep fractures in the Gangdise block control the distribution of the high value regions which may represent the shallow zones of strongly mineralized areas. The variance gradient regions with large Ag/Au ratio may represent the boundaries between strongly mineralized areas and weakly mineralized areas. In the middle part of the Gangdise block, gold and silver mineralization centers mainly distribute along the NW extending Coqen-Xigaze region, NE extending Yangbajain region and E-W extending Lhasa-Gongbogyamda region. The gold and silver mineralized rocks and ores may have been slightly denuded in the west of the middle Gangdise block, and the denudation in the east, however, may be stronger. The primary gold and silver prospect in the west may be better than in the east.

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