广西深泥田金矿床地质-地球化学找矿模型     

吴六灵邓杏彬  周建华李继贤 《地质通报》2004,23(7):689-694

广西深泥田金矿床是在桂东北地区新发现的硅化蚀变破碎带微细粒型金矿，产于1：20万化探金地球化学低丰度背景区。本文介绍了深泥田金矿床发现与勘查经过、成矿地质特征、地球化学特征，探讨了矿床不同尺度的找矿标志和找矿模型。  相似文献   

专题知识引导下土地利用遥感变化自动识别方法   总被引：3，自引：0，他引：3  

杨贵军  张继贤 《测绘信息与工程》2005,30(1):35-37

构建了基于GIS专题知识引导的土地利用变化自动检测技术与方法,在配准叠加情况下,以T1完整的土地利用类型图斑为单元构建各类别遥感数据知识库,然后以图斑单元计算遥感影像特征统计量,通过与知识库相关数据的比较与匹配,自动检测变化,识别相应的土地利用类别。  相似文献   

一种利用哨兵1号数据提取南极接地线方法     

陈嘉琪  王志勇  张继贤  徐志达 《测绘科学》2021,46(1):149-155

针对因IW工作模式数据在南极地区覆盖不全面导致对南极接地线的全面提取造成影响的问题,提出利用双差干涉测量提取接地线的基本原理,分别利用工作模式为IW和EW的Sentinel-1雷达卫星数据,对东南极毛德皇后地沿岸冰川接地线进行提取,将提取结果分别与MEa-SUREs接地线产品进行对比,同时再将这两种模式下的提取结果进行对比分析。结果表明,双差干涉测量可以去除冰流相位的影响,使用EW工作模式的Sentinel-1数据进行南极接地线提取可以忽略其地面分辨率较低这一缺陷,同时,这一模式的Sentinel-1数据在幅宽、南极覆盖范围等方面更具优势。因此,综合利用IW和EW工作模式的Sentinel-1数据,对南极接地线的全面、高效、长期动态监测具有重要意义。  相似文献   

Technical progress of China's national remote sensing mapping:from mapping western China to national dynamic mapping     

Jixian Zhang  Haiyan Gu  Wei Hou  Chunquan Cheng 《地球空间信息科学学报》2021,24(1):121-133

Remote sensing mapping is an important research direction in the development of geographic surveying and mapping.In order to successfully implement the project of Mapping Western China(MWC),a technical mapping system has been established.In this project,many problems have been solved through technological innovation,such as block adjustment with scarce control points,large-scale aerial/satellite image mapping,and intelligent interpretation of multi-source images.Several softwares were developed,e.g.PixelGrid for aerial/satellite image mapping in a large area,FeatureStation for the integration of multi-source data in the complex terrain areas,and an airborne multi-band and multi-polarization interferometric data acquisition system for SAR mapping.For the first time,full coverage of 1∶50,000 topographic data of China's land territory has been produced,which means the geospatial framework of digital China is basically completed.With the implementation of other key national plans and projects(i.e.national geographic conditions monitoring and national remote sensing map-ping),the focus has changed from MWC to national dynamic mapping.Accordingly,a dynamic mapping system is established.The data acquisition capability has developed from a single source to multiple sources and multiple modalities.The mapping capability has developed into dynamic mapping,and the capability for database update shows the characteristics of colla-boration.The national geographic condition monitoring creates a multi-scale index system for statistical analysis for various needs.A multi-level and multi-dimensional technical system for statistical computing and decision-making service is developed for the transformation from dynamic monitoring to information service.In this paper,we give a brief introduction about the recent development of remote sensing mapping in China with respect to data acquisition,map production,and information service.The purpose of this paper is to motivate the establishment of theory and method for remote sensing mapping,technical and equipment in the smart mapping era,to improve the capability of perceiving,analyzing,mining,and applying geographic data,and to promote the intelligent development of geographic survey-ing and mapping.  相似文献   

中原经济区城镇化与生态环境耦合发展时空差异研究     

李波  张吉献 《地域研究与开发》2015,(3)

以中原经济区所涉及的五省29个地级市为研究对象,运用主成分分析法对城镇化水平与生态环境质量分别进行综合评价,并将评价结果分别进行归一化处理,计算2003—2011年中原经济区各市的城镇化水平和生态环境质量的耦合度与耦合发展度。再用探索性空间数据分析法,在Arc GIS与Geo Da软件的支持下,对各市城镇化水平与生态环境质量耦合发展度进行时空差异分析。结果表明:各市城镇化水平与生态环境质量的耦合发展度在空间上表现出明显的局部空间自相关集聚格局,总体趋势为西北高东南低。据此,各市应采取不同的城镇化发展对策。  相似文献   

考虑定向参数精度信息的TerraSAR-X和SPOT-5HRS影像RFM联合定位     

程春泉  张继贤  黄国满  张力  杨景辉 《测绘学报》2017,46(2):179-187

卫星影像的RFM模型具有传感器无关的优点,适用于多源影像的几何定位处理,但在无地面控制点条件下联合定位时存在自主定位优势影像难以发挥主导作用且求解易发散的不足。本文通过将影像的先验自主定位精度和成像线性漂移转化为像方定向参数的精度和权信息,建立考虑影像定向参数精度信息的RFM模型。以12景TerraSAR-X和6对12景覆盖面积约为18万km2的SPOT-5HRS立体长条带影像为数据源,对两类影像定向参数先验精度配置偏差、SAR影像升降轨道方向、SAR影像数目、SAR影像分布等因素对定位精度的影响进行了系列定位试验,少量SAR与大范围HRS联合的影像自主定位平面/高程精度可达6.0m/4.2m。本文RFM平差模型无地面控制点定位精度和定向参数求解稳健性相对于传统模型有显著提升,是卫星影像无控制点1∶10万/1∶5万全球测图的一种潜在方法。  相似文献   

EPSG软件在大比例尺地形图缩编中的应用   总被引：1，自引：0，他引：1  

张理  赵吉先  杨铁柱 《测绘信息与工程》2008,33(3):33-35

介绍了EPSG的功能以及缩编规则与流程的介绍,阐述了EPSG软件在地图缩编中的具体应用,实现了大比例尺地图缩编.  相似文献   

基于经验模态分解的高分辨率影像融合(英文)   总被引：3，自引：0，他引：3  

王坚  张继贤  刘正军 《地球空间信息科学学报》2008,11(1):31-37

High resolution image fusion is a significant focus in the field of image processing. A new image fusion model is presented based on the characteristic level of empirical mode decomposition （EMD）. The intensity hue saturation （IHS） transform of the multi-spectral image first gives the intensity image. Thereafter, the 2D EMD in terms of row-column extension of the 1D EMD model is used to decompose the detailed scale image and coarse scale image from the high-resolution band image and the intensity image. Finally, a fused intensity image is obtained by reconstruction with high frequency of the high-resolution image and low frequency of the intensity image and IHS inverse transform result in the fused image. After presenting the EMD principle, a multi-scale decomposition and reconstruction algorithm of 2D EMD is defined and a fusion technique scheme is advanced based on EMD. Panchromatic band and multi-spectral band 3,2,1 of Quickbird are used to assess the quality of the fusion algorithm. After selecting the appropriate intrinsic mode function （IMF） for the merger on the basis of EMD analysis on specific row （column） pixel gray value series, the fusion scheme gives a fused image, which is compared with generally used fusion algorithms （wavelet, IHS, Brovey）. The objectives of image fusion include enhancing the visibility of the image and improving the spatial resolution and the spectral information of the original images. To assess quality of an image after fusion, information entropy and standard deviation are applied to assess spatial details of the fused images and correlation coefficient, bias index and warping degree for measuring distortion between the original image and fused image in terms of spectral information. For the proposed fusion algorithm, better results are obtained when EMD algorithm is used to perform the fusion experience.  相似文献   

架空输电线路机载激光雷达点云电力线三维重建   总被引：4，自引：1，他引：3  

林祥国  张继贤 《测绘学报》2016,45(3):347-353

电力线三维重建是机载激光雷达(LiDAR)电力巡线的一项重要任务之一。本文提出了一种基于架空输电线走廊机载LiDAR点云的电力线三维重建方法。首先,基于电塔LiDAR点和初始线路轨迹数据提取精确的电塔位置、电塔数量、线路轨迹、总档数等信息;然后,将线路分档,并确定每一档的二维空间范围和相应的电力线LiDAR点云;接着,分别对每一档的电力线LiDAR点云进行中心化投影,并利用k-means聚类将每一个电力线LiDAR点划分到相应的根;最后,利用直线和抛物线相结合的模型进行单档单根电力导线三维重建。两景试验表明,本文方法可以实现自动、高精度、正确的重建长距离架空输电线走廊电力线三维模型,重建过程中具有对电力线数目、空间配置结构、类型、粗差点、档距长度、点云不规则断裂等因素不敏感的优势。  相似文献   

我国亚热带湿润地区风沙化土地的水分状况及化学性质——以江西省新建县厚田地区为例     

张继贤 《中国沙漠》1989,9(1):75-84

厚田拙区的风沙化土地以风成沙丘、沙质风蚀坑、波状片状沙地、蔓荆子沙堆及河流沙质沉积阶地交错分布。河流沙质沉积阶地含量大于76.40%, 表层高达87.78%, 为该区土地风沙化提供了丰富的沙物质来源, 属潜在的风沙化土地。在河流沙质沉积阶地上形成的风成沙丘、波状片状沙地为严重的风沙化土地。文中以河流沙质沉积阶地及风成沙丘进行了水分状况及化学性质的对比分析, 以示由潜在的类型发展为严重风沙化的风成沙丘时, 水分条件, 养分、微量元素及矿物全量的分异情况。  相似文献