基于正射影像匹配的地形变化检测与更新算法   总被引：3，自引：0，他引：3  

李德仁  夏松  江万寿 《地理与地理信息科学》2006,22(6):9-11

利用新时期的航空影像和旧时期的DEM,基于正射影像匹配的相关理论,提出了地形变化检测和数据更新的自动化算法,该算法能够利用两个时期的未变化信息进行控制,避免了传统的定向过程,极大减少了人工编辑,能够同时得到变化检测的结果、更新后的DEM和DOM。实验结果证明了该算法的实用性和高效性。  相似文献   

层析成像技术在核反应堆地基勘察中的应用   总被引：3，自引：0，他引：3  

刘昌铨  孙振国  李长法 《物探与化探》2000,24(1):69-75

利用电磁波井间层析成像(CT)技术,查明核反应堆基岩裂隙、裂隙密集带和强-中等风化带的分布。研究同一钻孔不同特定方向剖面某些裂隙或裂隙密集带对电磁波吸收系数的变化特征,可以推测基岩裂隙带分布的优势方向。  相似文献   

GIS数据库几何精度评价及验证方法初探   总被引：6，自引：0，他引：6  

朱光良 《测绘工程》2000,9(2):45-50

通过用误差传播理论及 GIS数据库与遥感资料的叠合两种方法 ,对海宁市土地详查 GIS数据库进行几何精度分析 ,结果说明这两种方法是可行的。其中第二种方法会随着甚高分辨率遥感资料的普及而发挥越来越重要的作用。  相似文献   

基于典型相关分析的多元变化检测   总被引：11，自引：2，他引：9  

廖明生  朱攀  龚健雅 《遥感学报》2000,4(3):197-201246

通过对传统变化检测方法在不足的分析,引进典型相关分析的基础理论,将不同时相的多通道遥感数据视为分组的多元随机变量,利用典型我进行遥感数据的多变换进行遥感数据的多元化检测。实验结果表明,所提出的Ｍ变换方法用于多时相、多通道遥感影像的变化检测具有明显的优势和应用前景。  相似文献   

遥感图像自动解译面临的问题与解决的途径   总被引：20，自引：2，他引：18  

秦其明 《测绘科学》2000,25(2):21-24

遥感图像自动解译的目的是为了满足人们从海量遥感数据中快速识别与获取不同专题信息的需要。目前图像自动解译主要依赖地物光谱特征 ,其解译精度不高。解决这一问题的主要途径包括 :抽取遥感图像多种特征并综合利用这些特征 ,利用遥感图像解译背景数据库 ,在地理信息系统支持下实现背景数据与遥感信息覆合 ,采用专家系统完成遥感图像自动解译。  相似文献   

线阵列卫星传感器定向方法的研究     

邵巨良  王树根  李德仁 《武汉大学学报(信息科学版)》2000,25(4):329-333

介绍了确定线阵列卫星影像外方位元素的几种常用方法 ,通过试验对各种定向方法所能达到的地面点测定精度作了比较  相似文献   

Wavelet Compression and the Automatic Classification of Landsat Imagery     

J. B. K. Kiema 《The Photogrammetric Record》2000,16(96):997-1006

Investigation of the influence of data compression techniques on the quality and further processing of satellite sensor imagery is a research and development topic which remains both current and important. In principle, this extends the scope of data compression in remote sensing beyond the classical applications of data transmission and storage. Against this background, the main objective of this study is to examine the effect of data compression on the automatic classification of Landsat imagery. The main focus of this is on the built environment. In order to obtain better segmentation results, the feature base is expanded to include both spectral features, such as spectral signature and texture, and non-spectral features such as shape, structure and topology. This expansion enables the integration of context information into the feature extraction process. The image is systematically compressed (channel by channel) at compression rates ranging from 5 to 100 using wavelet-based software. An integrated, pixel-based classification approach is then used to segment the compressed imagery. The analysis of the results obtained indicates that a compression rate of up to 20 can conveniently be used without adversely affecting the segmentation results. The suitability of wavelet compression schemes for the compression of heterogeneous data is also underlined.  相似文献   

The Z/I Imaging Digital Camera System   总被引：1，自引：0，他引：1  

A. Hinz  & H. Heier 《The Photogrammetric Record》2000,16(96):929-936

Market needs for airborne and spaceborne imagery used in photogrammetry and GIS applications are changing. Fundamental changes in sensors, platforms and applications are currently taking place. Most recently, new high resolution spaceborne sensors have become available. Besides classical photogrammetry, new thematic applications will drive the future image market. Savings in cost and time, together with the need for higher and reproducible radiometric resolution or spectral information will push forward the change from analogue to digital imagery. High resolution satellites will compete with airborne film-based photography and digital camera systems.
With the availability of a digital airborne camera, it is possible to completely close the digital chain from image acquisition to exploitation and data distribution. The key decision regarding the camera design in this case is whether a linear or area array sensor should be used. In view of the high geometric accuracy requirements in photogrammetry, Z/I Imaging has focused development on a digital camera based on an area sensor. An essential aspect of this decision was not only the aerial camera system, but also the entire photogrammetric process to the finished photographic or mapping product. If this point of view is adopted, it becomes clear that the development of a digital camera involves more than simply exchanging film for silicon. Aspects such as data transfer rates, in-flight data processing and storage, image archiving, georeferencing, colour fusion, calibration and preprocessing have the same influence on the economic assessment of a digital camera system. This paper describes current development activities and application aspects of a digital modular airborne camera system.  相似文献   

Synoptic weather conditions during the pilot study of Bay of Bengal and Monsoon Experiment (BOBMEX)     

S. R. Kalsi 《Journal of Earth System Science》2000,109(2):211-220

BOBMEX-Pilot was organised from 23rd October–11th November, 1998 when the seasonal trough had already shifted to south Bay of Bengal. The activity during this period was marked by the development of a monsoon depression from 26th–29th October that weakened over the sea; onset of northeast monsoon along the east coast of India on 29th October; a low pressure area that formed on 2nd November over southwest Bay off Sri Lanka — southTamilnadu coast; and another cyclonic circulation that formed towards the end of the BOBMEX-Pilot period. This paper describes the development of these synoptic systems through synoptic charts and satellite data.  相似文献   

交叉点结构特征约束的机载LiDAR点云与多视角航空影像配准     

王广帅  万一  张永军 《地球信息科学学报》2020,22(9):1868-1877

针对机载点云与航空影像配准精度受点云密度影响较大的问题,本文提出一种交叉点结构特征约束下的机载点云影像配准方法。该方法充分利用激光测距精度较高这一优势,采用点云中的平面结构对影像区域网进行绝对定向约束。首先,利用POS辅助平差后的影像内外方位元素和影像交叉点结构匹配结果,以反投影距离为测度,按照最小二乘准则交会得到交叉点物方结构;然后,在LiDAR点云中自动探测交叉点结构的同名LiDAR平面点;最后,进行交叉点结构特征约束下的航空影像联合区域网平差,得到精确的相机内参数和影像外方位元素。实验结果表明,本文方法在平面和高程方向上均可达到1~2个像素的配准精度。与基于建筑物角特征的配准方法相比,有效克服了点云密度对配准精度的影响,当点云密度较低时,本文方法依然可以取得较高的配准精度。  相似文献