用线特征摄影测量对目标体素进行量测和重建的可行性研究   总被引：1，自引：1，他引：1  

李德仁  周国清 《测绘学报》1994,23(4):267-275

本文利用线特征摄影测量方法对ＣＡＤ实体造型中体素进行自动量测与重建、借此建立ＣＡＤ与数字摄影测量的桥梁，文中提出了一种以描述体素几何元素为未知数，直接在像片线特征与物体表面之间进行匹配的线特征摄影测量模型和方法，并对其可行性进行了实验，实验结果表明：线特征摄影测量能达到立体摄影测量相同的，甚至更高的精度，从而可解决无明显目标点工点物体的自动量测。  相似文献   

基于数码相机立体像对的物体3维信息快速获取方法   总被引：5，自引：0，他引：5  

于君明  黄小波 《测绘学院学报》2002,19(4):276-279

研究了数码相机的内方位元素检测和镜头畸变差校正，应用近景摄影测量的原理与方法，提出了一种基于立体像对无物方控制的物体表面3维模型信息快速获取方法，试验表明，该方法获取3维信息速度快、精度较高。同时文中还比较了可变焦数码相机和固定焦距相机在获取3维信息精度方面的差异。  相似文献   

基于数字摄影的钢结构变形监测系统研究   总被引：3，自引：0，他引：3  

李妍  于承新 《测绘信息与工程》2002,27(2):14-15

讨论了基于数字摄影的钢结构变形监测系统研究所解决的主要问题，提出了相应的解决方法，并论述了整个系统的流程。  相似文献   

Comparison of resection–intersection algorithms and projection geometries in radiostereometry     

Niclas Brlin 《ISPRS Journal of Photogrammetry and Remote Sensing》2002,56(5-6)

Three resection–intersection algorithms were applied to simulated projections and clinical data from radiostereometric patients. On simulated data, the more advanced bundle-adjustment-based algorithms outperformed the classical Selvik algorithm, even if the error reductions were small for some parameters. On clinical data, the results were inconclusive.The two different projection geometries had a much larger influence on the error size and distribution. For the biplanar configuration, the position and motion errors were small and almost isotropic. For the uniplanar configuration, the position errors were comparably high and anisotropic, but still resulted in a high accuracy for some motion parameters at the expense of others.The simplified resection–intersection algorithm by Selvik may still be considered a good and robust algorithm for radiostereometry. More studies will have to be performed to find out how the theoretical advantages of the bundle methods can be utilized in clinical radiostereometry.  相似文献   

航空遥感在佛山城市空间环境质量评价中的应用     

赵滔滔 《四川测绘》1996,19(3):116-119

本文主要介绍利用佛山市航空遥感综合调查资料分析城市环境的空间结构，建立了空间结构分类系统，探讨了城市形态的变化，综合评价城市空间环境质量，并提出一些改善环境质量的建议．  相似文献   

Cartography and the others – aspects of a complicated relationship     

Wolfgang Kainz 《地球空间信息科学学报》2020,23(1):52-60

ABSTRACT

Cartographic visualizations have been known for thousands of years and have brought forth a wealth of different map projections and cartographic products. Yet, cartography as an independent science has been established only about 100 years ago and sometimes its position among the spatial disciplines is challenged by the scientific community. In this respect it is a young science based on a very long tradition of map making, globe production, and the development of map projections. Maps and map related visualizations play an important and indispensable role in many other spatial disciplines such as geography and geodesy. Cartography has many overlaps with these traditional disciplines as well as with the more recent ones of photogrammetry and remote sensing. This paper reviews fundamental aspects of the conception of space and time throughout human history, the historic development of cartography from a technique of map making to a spatial science, highlighting major milestones in the history of the discipline. As a young science and confronted with major technological developments in the late 20^th century cartography underwent several crises as to what exactly is cartography and how it relates to other spatial sciences, in particular to geographic information systems. Major pitfalls and misconceptions are discussed and the three major scientific pillars of cartography are identified. The relationships of cartography with neighboring disciplines are discussed and the position of cartography vis a vis the others is delineated. Finally, desirable future developments of scientific cartography are discussed.  相似文献   

System structure and calibration models of intelligent photogrammetron     

PANHeping ZHANGChunsen 《地球空间信息科学学报》2003,6(2):48-54

This paper describes the structure,geometric model and geo-metric calibration of Photogrammetron I-the first type of photogrammetron which is designed to be a coherent stereo photogrammetric system in which two cameras are mounted on a physical base but driven by an intelligent agent architecture.The system calibration is divided into two parts:the in-lab calibration determines the fixed parameters in advance of system operation,and the insitu calibration keeps tracking the free parameters in real-time during the system operation.In a video surveillance set-up, prepared control points are tracked in stereo image sequences,so that the free parameters of the system can be continuously updated through iterative bundle adjustment and kalman filtering.  相似文献   

卫星摄影三线阵CCD影像的EEP法空中三角测量（三）   总被引：1，自引：1，他引：0  

王任享 《测绘科学》2002,27(1):1-7

4 平差方案及模拟数据平差实验4.1 自由网+控制点空中三角测量由前方交会(2.1)式,后方交会(2.2)式以及外方位元素平滑制约条件(2.3)式,可以构成类似经典的光束法空中三角测量,但由于EFP像点坐标是推算出来的,所以控制点不宜直接参与平差过程.于是平差要分成自由网平差及利用控制点作三维线性变换两个步骤.另一方面,卫星摄影中起始角元素大约在±0.5°左右,对于经典空中三角测量,角元素起始近似值均可按零处理.但在EFP平差中,φ角起始值φ0对空中三角测量,像元素起始近似值均可按零处理.在EFP平差中,φ角起始值φ0对整条航线的几何状态影响很大,必须采用特殊的程序预先加以确定.我们采用不断步进φ角值,比较由前方交会及(1.2)式计算的Y视差的均方根值最小者,即作为φ的最佳起始值.平差框图见图4.  相似文献   

利用高分辨率影像建立三维虚拟校园——以"数字成都理工大学"为例     

曾涛  杨武年  余代俊  简季  刘汉湖  戴晓爱 《物探化探计算技术》2006,28(3):250-254

以数字化校园工程———“数字成都理工大学”为例,探讨利用航空影像和数字摄影测量技术,获取基础空间地理信息的方法及途径。并采用三维建模软件Cyber C ity对建筑物进行三维建模。而对于复杂地物,采用三维地理信息系统IMAGIS软件建立单个模型,从而实现了成都理工大学校区的三维可视化虚拟重建和漫游。实践证明,利用数字摄影测量技术和遥感影像,能够有效地获取大范围区域地表地物的三维信息,并快速地建立地面模型和三维景观。  相似文献   

昆山市政府广场三维可视化解决方案     

王晞  郑斌 《现代测绘》2006,29(3):38-40

基于大比例尺航空立体相对提出昆山市政府及周边建筑群的建模方案,采用VirtuoZo数字摄影测量系统提取地面要素信息,在IMAGIS三维可视化地理信息系统下进行三维模型重建和编辑,在此基础上形成由CAD、GIS、三维影像数据集成的城市三维可视化处理方法,实现对三维场景进行实时漫游,并将漫游过程录制成动画,在Premiere中完成音频视频合成制作,形成最终多媒体产品。  相似文献