机载激光雷达技术的数据处理与4D产品制作     

李淑琴 《全球定位系统》2012,37(2):43-47

主要介绍了机载激光雷达的点云数据的获取、处理流程及其关键技术,并结合自己的工作经验详细阐述了运用点云数据制作4D产品的过程,预测未来遥感与GIS技术在数据获取方面的发展趋势,即借助机载激光雷达,再现真实三维场景。  相似文献   

Delineation of boundary between tropical/subtropical in the middle section for eco-geographic system of South China     

WU Shao-hong  ZHENG Du 《地理学报》2001,11(1):80-86

This paper discusses division on tropical/subtropical boundary of middle section in South China. This discussion results in new understanding on eco-geographic regions and their boundaries, especially on gradual changes of natural conditions between eco-geographic regions. It analyzes results of the same area by other researchers, clarifies differences and causes of the differences for the results. Boundaries of eco-geographic regions cannot be drawn as a line as changes from tropical to subtropical are gradual. Therefore, for an eco-geographic region like tropical zone, definite boundaries must be mapped while gradual changes are considered. Temperature, vegetation and soil are the indexes to divide tropical and subtropical. After indexes of tropical zone are confirmed, data of annual average index reflect general state of the tropical zone. Line from such data is called “tropical boundary”. On the other hand, affected by the monsoon climate, some years are hotter and some are cooler. In hotter years, temperature of north area of tropical boundary reaches tropical state whereas in cooler years, such area moves southward. Boundary of the hottest year is called annual tropical line and that of the coolest year true tropical line. Temperatures in areas south to annual tropical line can probably reach tropical in some years. Temperatures in areas south to real tropical line reach tropical every year. The area from true tropical to annual tropical is called tropical fluctuating zone. Therefore, new concepts of tropical, annual tropical, true tropical and tropical fluctuating zone are formed to understand tropical area from a new point of view in the paper. Based on the indexes of climate, vegetation and soil, boundaries of tropical, annual tropical, true tropical and tropical fluctuating zone of the study area are established. The tropical fluctuating zone explains different locating of different researchers. The paper also puts forward a new method to display boundary for eco-geographic regions.  相似文献   

Significance of the fundamental mantle rotational relaxation mode in polar wander simulations     

L. L. A. Vermeersen  R. Sabadini 《Geophysical Journal International》1996,127(2):F5-F9

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关于清河镇动物群和昌图动物群化石的一些问题──答陈孟莪的质疑   总被引：3，自引：0，他引：3       下载免费PDF全文

刘效良 《地质科学》1994,29(2):186-193

本文根据手标本上、岩石切片上以及岩样上所见的化石与国外发表的已知假化石作了比较研究;从用酸溶样实验提取了化石的论据;对微体化石与其它的微体化石的共生现象进行了研究;还从化石出现与重现的实际资料、化石的生物组织和结构特征与已知生物化石进行了对比,并从生物信息、化石的化学成分、矿物成分的测试等几个主要方面论证了两群化石的真实性质。  相似文献   

岩层真厚度计算的新公式   总被引：3，自引：1，他引：3  

徐少康 《化工矿产地质》2006,28(4):209-217

将数学方法与地质实际相结合,严密推导出一个岩层真厚度计算的新公式。与前人公式相比,新公式涵盖了各种可能的情况,形式简单,概念明确,操作方便,利于编写软件用计算机计算．从而避免了复杂的人工判断,不但可减轻人工负荷、提高计算速度,更重要的是避免了出错的可能性．  相似文献   

在EXCEL上自动计算岩层厚度     

刘祁生姜海华  陈文华 《中国煤田地质》2006,18(3):26-28

岩层厚度的计算是野外地质工作内业整理和地质分析中的一项经常性工作，传统的工作方法往往要花费地质人员大量的时间和精力。利用EXCEL电子表格中的函数关系，通过编辑公式进行岩层厚度的计算，从而能正确、简单、快捷地完成此项工作，大大地提高野外地质人员的内业整理工作效益。  相似文献   

Relative hotspot motions versus True Polar Wander     

T.H TorsvikAuthor Vitae  R Van der VooAuthor VitaeT.F RedfieldAuthor Vitae 《Earth and Planetary Science Letters》2002,202(2):185-200

The fixity of hotspots and mantle plume locations has long been axiomatic. If the assumption of fixed hotspots is granted, ‘absolute’ plate motions and movements of the spin axis with respect to the hotspot framework, defined by some as True Polar Wander (TPW), can be determined. However, this assumption can be tested by paleomagnetic data, and such tests are gradually raising some doubts about the fixity of hotspots. The result is that discrepancies between Cretaceous and Tertiary hotspot and paleomagnetic reference frames are now beginning to be interpreted as the result of plume drift within a convective mantle. In the Indo-Atlantic, hotspots have remained relatively stationary with respect to the spin axis for the last 95 million yr. However, the Pacific hotspots, notably Hawaii, appear to have undergone large-scale southward drift with respect to the spin axis during the Early Tertiary. Global paleomagnetic data do not indicate that any TPW occurred during the Late Cretaceous or Tertiary. Although the Early Cretaceous paleomagnetic and hotspot frames for the Indo-Atlantic realm can be interpreted as slow TPW, direct estimates of paleolatitude and hotspot motion, in particular the Kerguelen hotspot, challenge TPW as a global phenomenon. At present, we consider that the large Early Cretaceous discrepancy between hotspot and paleomagnetic data is best explained by southward drift of the Atlantic hotspots prior to ∼95 Ma.  相似文献   

乡村游客真实性体验模型研究     

陈才  赵志峰 《地理科学》2021,41(7):1237-1245

关于乡村旅游体验的研究,多以“乡村性”为主题,鲜有基于“真实性”视角的深入探讨。文章基于真实性视角,采用混合研究方法,构建乡村游客真实性体验模型,并进行验证。首先,通过质化研究,构建出“真境”“真情”“真智” “真我”4个维度的概念模型;其次,采用量化研究,验证了“真境”“真情”“真智”“真我”4个维度的合理性,4个维度存在中等程度的关联性,进一步验证表明,4个维度可以收敛在二阶变量“真实性体验”上。乡村游客真实性体验模型既拓展了真实性理论的应用范围,又进一步发展了真实性理论的内涵,为指导乡村旅游实践提供了理论基础。同时,真实性也是乡村游客深层动机的核心元素之一,即可作为乡村性的一个维度,也可独立应用于乡村旅游研究之中。  相似文献   

真实自回避行走中晶体生长界面结构的分形行为     

彭年刘永顺  聂保锋刘宁强 《岩石矿物学杂志》2007,26(5):449-452

晶体生长过程实际上就是生长基元从周围环境中不断地通过界面而进入晶格座位的过程。一般认为,研究生长基元以何种方式以及如何通过界面进入晶格座位是晶体生长界面结构研究中的关键。在生长基元以分子或者原子的微粒子形式在生长环境中进行无规游走的前提下,本文运用真实自回避行走(TSAW)模型,通过重整化群思想来研究晶体生长界面结构的分形行为。研究发现:晶体生长界面结构的分形行为与生长基元的游走路径形态密切相关,并且在理想状况下真实自回避行走与标准Koch曲线的分形维极为接近。  相似文献   

Occlusion-Compensated True Orthorectification For High-Resolution Satellite Images     

Liang-Chien  Chen Tee-Ann  Teo Jen-Yu  Wen Jiann-Yeou  Rau 《The Photogrammetric Record》2007,22(117):39-52

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