卫星遥感影像中耕地信息的自动提取方法研究   总被引：14，自引：9，他引：14  

赵庚星  窦益湘  田文新  张银辉 《地理科学》2001,21(3):224-229

以县（市区）为基本单位，采用遥感图像处理ENVI3.2软件和TM资料，进行了7个县（市区）10个时相的耕地信息自动提取技术研究，结果证明，选择春季时相，TM432波段合成，经几何校正和增强处理，通过交互的非监督分类提取耕地信息，可以获得满意的结果，平均分类精度达到98.22%。  相似文献   

地震安全性评价和高层建筑的地震动输入   总被引：4，自引：1，他引：3  

杨柏坡  窦立军 《地震工程与工程振动》2000,20(1):35-41

本文根据现行的中国地震烈度区划图中烈度的含义,指出在使用现行“建筑抗震设计规范”时存在的一些问题和与《中华人民共和国防震减灾法》的不协调之处。根据多年参加工程场地地震安全性评价的经验,总结了目前进行地震安全性评价过程中存在的一些问题。文中建议：针对高层建筑进行新的场地分类方法的研究;对高层建筑工程场地作地震安全性评价时,可根据高度的不同,适当简化安全性评价过程。  相似文献   

基于分布式计算模式的GIS的设计与实现     

刘达  谭继强  窦春和 《测绘与空间地理信息》2007,30(3):150-153

介绍了分布式GIS和分布式计算模式的概念,探讨了基于分布式计算模式的地理信息系统的体系结构、运作机制、关键技术和实现方法,最后对未来的分布式地理信息系统发展进行了展望。  相似文献   

遥感影像反立体纠正方法研究     

周爱霞  高连峰 《国土资源遥感》2007,18(2):20-22

以四川省广元市某区遥感影像为例，尝试了一种基于DEM和IHS变换的遥感影像反立体纠正方法。该方法首先对IHS变换得到的亮度分量I进行滤波处理，将反映地物反射率差异的亮度信息与地形因子信息分离，然后用DEM制作的地形阴影图替换原图像中的地形因子信息，最后进行IHS反变换。试验结果表明，该方法能有效纠正遥感图像上的反立体现象，并基本保持与原图像色彩一致。  相似文献   

日较差分级的新疆逐时气温预报     

陈春艳  李如琦  唐冶  窦新英 《沙漠与绿洲气象(新疆气象)》2007,1(2):10-12

利用1994-2005年新疆12个基准站逐时气温资料,统计了不同日较差等级内的逐时气温和逐时气温变量的气候平均值,并在此基础上自动地输出新疆逐站逐时气温预报值,由此得到与气温变化有关的专业气象预报产品,应用于专业气象业务。  相似文献   

Genesis of the Changba–Lijiagou Giant Pb-Zn Deposit, West Qinling, Central China: Constraints from S-Pb-C-O isotopes     

WEI Ran  WANG Yitian  MAO Jingwen  HU Qiaoqing  QIN Siting  LIU Shengyou  YE Dejin  YUAN Qunhu  DOU Ping 《《地质学报》英文版》2020,94(4):884-900

The extensive Changba-Lijiagou Pb-Zn deposit is located in the north of the Xihe–Chengxian ore cluster in West Qinling. The ore bodies are mainly hosted in the marble, dolomitic marble and biotite-calcite-quartz schist of the Middle Devonian Anjiacha Formation, and are structurally controlled by the fault and anticline. The ore-forming process can be divided into three main stages, based on field geological features and mineral assemblages. The mineral assemblages of hydrothermal stage I are pale-yellow coarse grain, low Fe sphalerite, pyrite with pits, barite and biotite. The mineral assemblages of hydrothermal stage II are black-brown cryptocrystalline, high Fe shalerite, pyrite without pits, marcasite or arsenopyrite replace the pyrite with pits, K-feldspar. The features of hydrothermal stage III are calcite-quartz-sulfide vein cutting the laminated, banded ore body. Forty-two sulfur isotope analyses, twenty-five lead isotope analyses and nineteen carbon and oxygen isotope analyses were determined on sphalerite, pyrite, galena and calcite. The δ34 S values of stage I(20.3 to 29.0‰) are consistent with the δ34 S of sulfate(barite) in the stratum. Combined with geological feature, inclusion characteristics and EPMA data, we propose that TSR has played a key role in the formation of the sulfides in stage I. The δ34 S values of stage II sphalerite and pyrite(15.1 to 23.0‰) are between sulfides in the host rock, magmatic sulfur and the sulfate(barite) in the stratum. This result suggests that multiple S reservoirs were the sources for S2-in stage II. The δ34 S values of stage III(13.1 to 22‰) combined with the structure of the geological and mineral features suggest a magmatic hydrothermal origin of the mineralization. The lead isotope compositions of the sulfides have 206 Pb/204 Pb ranging from 17.9480 to 17.9782, 207 Pb/204 Pb ranging from 15.611 to 15.622, and 208 Pb/204 Pb ranging from 38.1368 to 38.1691 in the three ore-forming stages. The narrow and symmetric distributions of the lead isotope values reflect homogenization of granite and mantle sources before the Pb-Zn mineralization. The δ13 CPDB and δ18 OSMOW values of stage I range from-0.1 to 2.4‰ and from 18.8 to 21.7‰. The values and inclusion data indicate that the source of fluids in stage I was the dissolution of marine carbonate. The δ13 CPDB and δ18 OSMOW values of stage II range from-4 to 1‰ and from 12.3 to 20.3‰, suggesting multiple C-O reservoirs in the Changba deposit and the addition of mantle-source fluid to the system. The values in stage III are-3.1‰ and 19.7‰, respectively. We infer that the process of mineralization involved evaporitic salt and sedimentary organic-bearing units interacting through thermochemical sulfate reduction through the isotopic, mineralogy and inclusion evidences. Subsequently, the geology feature, mineral assemblages, EPMA data and isotopic values support the conclusion that the ore-forming hydrothermal fluids were mixed with magmatic hydrothermal fluids and forming the massive dark sphalerite, then yielding the calcite-quartz-sulfide vein ore type at the last stage. The genesis of this ore deposit was epigenetic rather than the previously-proposed sedimentary-exhalative(SEDEX) type.  相似文献   

块系岩体非协调动力响应特征试验研究     

王凯兴  窦林名  潘一山  OPARIN V N 《岩土力学》2020,41(4):1227-1234

岩体在块系构造状态下的动力传播存在块体和块体间软弱介质的非协调变形现象，对岩体结构的动力稳定产生重要影响。目前块系岩体的非协调动力传播响应研究尚不充分，导致不能进行有效的动力响应特征识别。通过试验对块系岩体非协调动力传播过程岩块动力响应特征进行研究，分别从动力传播速度、岩块加速度振幅衰减、岩块振动位移响应、岩块振动持续时间、块体动能显现、块体振动频域响应特性等方面对比纵波传播，给出块系岩体非协调动力传播的特征分析。通过分析可知，块系介质非协调变形运动产生的动力传播现象相比于纵波传播是一种低频低速波，并伴随着岩块的大位移运动，同时岩块振动持续时间较长，蕴含着动能与势能的相互转换过程，这些现象构成了块系岩体非协调动力传播的重要特征。该研究将为识别岩体非协调动力传播特征及块系岩体的冲击预警波动特征识别提供参考。  相似文献   

点蚀损伤下桩基式平台腿柱轴压极限承载力研究   总被引：2，自引：0，他引：2  

王仁华  方媛媛  窦培林  林振东 《海洋工程》2015,33(3):29-35

采用圆柱体点蚀损伤模型,建立含细观尺度点蚀损伤的桩基式平台腿柱多尺度精细化数值模型,研究壁厚损伤度、点蚀损伤强度以及点蚀体积损伤强度影响平台腿柱轴压极限承载力的规律。研究结果表明,壁厚损伤度及点蚀损伤强度明显削弱平台腿柱的极限强度,且随点蚀损伤强度增大壁厚损伤度的影响加剧;点蚀体积损伤强度由于综合考虑了壁厚损伤度和点蚀损伤强度的耦合因素,相比于独立考虑后两者,其更能合理地描述点蚀损伤对平台腿柱极限强度的影响,故点蚀体积损伤强度体现了点蚀损伤的关键特征。本方法不仅适用于研究点蚀损伤构件的极限承载力,其所提出的点蚀损伤模型的构建方法,可拓展于研究受点蚀损伤的整体平台结构的极限承载力,且确定点蚀体积损伤强度为描述点蚀损伤特征的关键参数后,有望将其用于修正点蚀损伤平台腿柱的承载力设计公式。  相似文献   

Research of Marine Sensor Web Based on SOA and EDA     

JIANG Yongguo  DOU Jinfeng  GUO Zhongwen  HU Keyong 《中国海洋大学学报(英文版)》2015,(2):261-268

A great deal of ocean sensor observation data exists, for a wide range of marine disciplines, derived from in situ and remote observing platforms, in real-time, near-real-time and delayed mode. Ocean monitoring is routinely completed using sensors and instruments. Standardization is the key requirement for exchanging information about ocean sensors and sensor data and for comparing and combining information from different sensor networks. One or more sensors are often physically integrated into a single ocean ‘instrument' device, which often brings in many challenges related to diverse sensor data formats, parameters units, different spatiotemporal resolution, application domains, data quality and sensors protocols. To face these challenges requires the standardization efforts aiming at facilitating the so-called Sensor Web, which making it easy to provide public access to sensor data and metadata information. In this paper, a Marine Sensor Web, based on SOA and EDA and integrating the MBARI's PUCK protocol, IEEE 1451 and OGC SWE 2.0, is illustrated with a five-layer architecture. The Web Service layer and Event Process layer are illustrated in detail with an actual example. The demo study has demonstrated that a standard-based system can be built to access sensors and marine instruments distributed globally using common Web browsers for monitoring the environment and oceanic conditions besides marine sensor data on the Web, this framework of Marine Sensor Web can also play an important role in many other domains' information integration.  相似文献   

众源矢量数据分块纠正研究     

邵鑫  王艳东  豆明宣 《测绘与空间地理信息》2021,44(12):11-14,18

众源矢量数据能够提供丰富的地理信息,但存在几何误差分布不均匀问题.针对众源矢量数据几何误差问题,本文提出一种众源矢量数据分块纠正方法.以遥感影像作为标准数据,通过模板匹配得到遥感影像与众源矢量数据的同名点,根据同名点的几何误差分布对众源矢量数据切分及分块纠正,最后拼接纠正结果实现众源矢量数据的纠正.本文以上海市OpenStreetMap矢量道路网作为实验数据进行分块纠正实验,实验结果表明分块纠正后众源矢量数据几何误差显著降低.  相似文献