青海省斑岩铜矿地质特征及找矿方向探讨     

张梅芬  刘建华  肖文进  杨自安 《矿产与地质》2007,21(4):440-444

以纳日贡玛斑岩型钼铜矿床为例,对青海省斑岩铜矿产出的地质构造环境、地质特征、成矿地质条件、含矿建造等条件进行了综合分析。在此基础上,对本省斑岩铜矿的找矿方向进行了初步探讨,提出了斑岩型铜矿床的区域构造-岩浆岩带、区域地球物理、地球化学、围岩蚀变等找矿标志,划分出有远景的五大斑岩型铜矿成矿带。  相似文献   

地面起伏对成像及雷达景象匹配的影响   总被引：5，自引：0，他引：5  

叶勤  李启炎 《测绘学报》2002,31(Z1):50-55

景象匹配是飞行器导航与定位的一种重要手段,其中的雷达图像匹配由于具有全天候的特征而受到人们的重视.在分析了实时雷达图像成像方式的基础上,具体分析了地面高程起伏对雷达图像构像的影响,并进一步推导出在实时雷达图像上,图像像点位移与地面高程起伏的具体关系;以及为了保证一定的匹配定位精度,对于实飞地区地面起伏的定量要求.同时还对导航定位匹配所用的参考基准图受地面高程起伏的影响情况进行了定量的分析,并对理论情况和实际图像进行了计算分析与比较,最后得出在给定匹配精度的情况下,生成参考图时对成像区域内点之间的高差限制要求.  相似文献   

浅析解析测图仪相对定向的不定性     

施健 《测绘与空间地理信息》2002,25(1):23-24

通过长期的生产实践提出了相对定向不定性的问题,从相对定向的数学关系着手,列出解求相对定向元素的方程组,分析了产生相对定向不定性的原因,提出了相对定向的结果必须是模拟显示结果与数字显示结果的统一.  相似文献   

利用GCM模式对全球雷电活动的模拟分析   总被引：4，自引：0，他引：4  

张敏锋  刘欣生  张义军 《大气科学》2001,25(5):689-696

将修正的参数化方案嵌套入美国马里兰大学海-陆-气研究中心的全球大气环流谱模式(COLAGCM),建立了可用于全球雷电活动模拟与估测的模式系统.通过对模式输出与实况资料的对比,检验其气候模拟性能.虽然模式的分辨率较低但经过较长时间积分,仍可再现实况资料的主要特征.性能良好,计算稳定,且因时间步长较大可大大节省机时.耦合模式系统经长时间的积分后,模拟的多年平均的全球雷电频次时空分布及变化与观测分析较一致.全球范围内每秒钟平均有79次的雷电发生,陆海比为12.2.多发生在北半球夏季且具明显的季节变化特征.  相似文献   

Fourcade: the Centenary of a Stereoscopic Method of Photographic Surveying     

Laurence P. Adams 《The Photogrammetric Record》2001,17(98):225-242

In the Preface to his book, The Four Faces of Fourcade, Clare Storrar (1990) wrote: "It is di.cult to appreciate the breadth and depth of Henry Georges Fourcade's intelligence and creative power. He was an intellectual giant, a phenomenon, whose theoretical and practical achievements have never received proper recognition. These were all the more remarkable because he began his original work on photogrammetry when science in South Africa was in its infancy, and he laboured alone far from libraries and other research facilities. His only higher academic training was in land surveying. He was adept in each of four sciences at various stages in his life, but, mainly because of his natural reserve, his reputation was highly compartmentalised. To foresters he was 'the most brilliant forestry officer of his time' to surveyors, he was exceptionally learned in theory and skilled in practice. Photogrammetry was a new subject, unheard of, except by a handful of scientists. In botany, which he took up seriously at the age of fifty-five, his work was highly regarded by leading botanists in South Africa and in Europe. All stood in awe of his extraordinary talent and ability. Some were frightened of him. But few were able—in fact, not even the best brains were wholly qualified—to grasp fully the tremendous intellectual stature and potential of this protean man."
This paper briefly describes the historic achievements of Henry Georges Fourcade, with the emphasis on his land surveying and, in particular, his photogrammetric contributions to science. The centenary of one of these, his proposal of a stereoscopic method of photographic surveying, occurs in October 2001.  相似文献   

Book Reviews     

《The Photogrammetric Record》2001,17(98):365-387

Books reviewed;
D. Fritsch and R. Spiller, Photogrammetric Week '99.
D. R. Wilson, Air Photo Interpretation For Archaeologists
D. R. Green, Gis: A Sourcebook For Schools
R. Gower, Workshop On National Mapping Agencies And The Internet
A. Flotron and O. Koelbl, Precision Terrain Models For Civil Engineering
P. Atkinson and D. Martin, Gis And Geocomputation. Innovations In Gis 7
R. P. Kirby, Revision Measurement Of Large Scale Topographic Data
J. Höhle, Automatic Orientation Of Aerial Images On Database Information
S. Dequal, L. A. Koen and F. Renaudo, Comparison Of National Guidelines For Technical And Cadastral Mapping In Europe ("Ferrara Test")
P. J. Gibson, Introductory Remote Sensing: Principles and Concepts
T. Luhmann, Nahbereichsphotogrammetrie: Grundlagen, Methoden Und Anwendungen  相似文献   

地形图数字化中图纸定向问题研究     

申立群 《测绘与空间地理信息》2001,24(3):13-15

从实践经验出发,结合相关技术基础,介绍在AutoCAD下进行地形图数字化时,原图定向的几种方法,并从精度、效率等方面进行了比较,最后给出软件实现的数字模型.  相似文献   

Seismotectonic deformation during the filling of Toktogul Reservoir,Kirghizia     

S. Yunga  D. Simpson  A. Kondratenko 《Pure and Applied Geophysics》1996,147(2):419-431

Natural seismicity and induced seismic events are discussed in the context of the seismotectonic deformation method through the example of earthquakes in the Toktogul Reservoir region in the Central Tien Shan, Kirghizia. The parameters of seismotectonic deformation of various sites in the Toktogul Reservoir region are described, based on a statistical study of focal mechanisms. The relationship of induced seismicity to changes of water level in the reservoir is reviewed. The temporal stress-strain characteristics are investigated. Average focal mechanisms for the entire region, as well as areas in the immediate vicinity of Toktogul Dam are analyzed. The vertical component of seismotectonic deformation varies in time from compression to extension-opposite to what is expected from the influence of the reservoir load; strike-slip motions become oblique thrusts. Changes in the orientation of focal mechanisms coincide with the time of maximum rate of the filling of the reservoir.  相似文献   

Particle motion and the modelling of strain response in magnetic fabrics   总被引：1，自引：0，他引：1  

Carl Richter 《Geophysical Journal International》1992,110(3):451-464

  相似文献   

Study on terrestiral noise in data of geomagnetic total field in North China     

Xi-Xian Ren  Yu-Min Zhang  Zhi-Jia Zhan  Jin-Tian Gao 《地震学报(英文版)》1993,6(4):939-947

The terrestrial noise in the differencial data of geomagnetic total field recorded at 21h in North China was fitted by using the geomagnetic vector data from Beijing Observatory. The terrestrial noise level and its spatial feature in this region was discussed. A method, which may be useful for justifying the quality of fitting, was provided in this paper. The analysis indicates that the terrestrial noise is one of the important noise in tectonomagnetic study. It is shown that the susceptibility effect is quite small and the orientation effect is the main component in the terrestrial noise in North China. The rough spatial feature of the magnetic anomaly in crustal substance was infered from the spatial feature of terrestrial noise. The measurement precision and the source noise level of data at 21h in this region were obtained in the analysis of residual noise. The Chinese version of this paper appeared in the Chinese edition ofActa Seismologica Sinica,15, 441–447, 1993.  相似文献