共查询到18条相似文献,搜索用时 93 毫秒
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为探究不同测量方法获取浅沟数据的精度,本文以元谋干热河谷区浅沟为例,采用RTK、三维激光扫描、近景摄影测量等多种测量方法获取浅沟数据,建立DEM并提取浅沟形态参数,对比近景摄影测量以不同方式获取标记坐标后建立DEM的差异,同时以测针板实测浅沟横剖面为参照,对比分析不同测量方法获取浅沟横剖面的精度。结果表明:RTK获取密度较低的点数据,建立的DEM较粗糙,仅体现沟缘大致走向;近景摄影测量+RTK方法测得的DEM高程整体低于近景摄影测量+全站仪所得DEM高程;利用三维激光扫描仪和近景摄影测量+全站仪两种方法获取数据所提取的浅沟形态参数精度较高;对比浅沟横剖面,横剖面近景摄影测量+全站仪测量所得与实测横剖面重合度较高。因此,利用近景摄影测量+全站仪进行浅沟测量,在精度、效率等方面优势较大。 相似文献
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本文研究的无控制数字近景摄影测量系统是集GPS、电子经纬仪、数码相机和个人数字助理(PDA)等硬件设备于一身,辅以数据处理中心,形成的一种快速的目标三维、纹理和属性信息获取的新型测量系统。该系统是对传统地面摄影测量作业方式的一次提升,是对国内地面(近景)摄影测量领域一体化仪器的补充。 相似文献
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旋转多基线数字近景摄影测量 总被引:5,自引:0,他引:5
提出了一种全新的数字近景摄影测量方法——旋转多基线数字近景摄影测量。该方法通过应用旋转摄影增大了摄影视场角,应用"多基线"的摄影方式增大了摄影交会角,提高了交会精度,并且解决了近景摄影测量中大交会角影像难以实现自动匹配的困难。同时,该方法将传统的区域网空中三角测量应用于近景摄影测量,用于影像外方位元素的解算,在提高精度的同时减少了外业工作量,提高了生产效率。 相似文献
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近景摄影测量在文物修复保护研究中的应用 总被引:2,自引:0,他引:2
随着计算机技术的不断发展,近景摄影测量作为地面立体摄影测量的一个分支正被广泛地应用于各个领域,将其应用于测绘生产必将为特殊行业提供一个适时获取准确的信息资料的发展空间。着重介绍近景摄影测量在文物修复保护研究中的应用。 相似文献
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近景摄影测量可以快速、自动地获取监测对象的点云数据,具有自动化程度高、劳动强度小等特点。本文在阐述Lensphoto多基线数字近景摄影测量系统的原理和监测流程基础上,采用该系统对矿区开采沉陷区进行变形监测,获取了沉陷区不同阶段的地表移动变形值。监测结果表明:近景摄影测量方法应用在矿区开采沉陷监测中是可行的,相对于全站仪测量,具有获取沉降数据丰富、生产效率高等特点。 相似文献
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阐述了利用全数字摄影测量工作站在近景摄影测量中的应用,以“西夏王陵”数字成果的如何获取介绍经验。 相似文献
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In close-range photogrammetry, 3D information acquisition is based on image matching. The application of code marker helps to improve the level of automatic matching and the matching accuracy. This paper investigates the application of inertia ellipse algorithm to code marker matching. We can calculate the inertia ellipse of a target with a certain boundary. First, the method is applied to a single code marker; the angle and scaling are valid. Then, the paper introduces the multi code markers matching method by the inertia ellipse. Rotation and scaling changes of homonymy images can be calculated by inertia ellipse algorithm. These parameters can be used for code marker matching in arbitrary attitude close-range photogrammetry. 相似文献
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In close-range photogrammetry, 3D information acquisition is based on image matching. The application of code marker helps
to improve the level of automatic matching and the matching accuracy. This paper investigates the application of inertia ellipse
algorithm to code marker matching. We can calculate the inertia ellipse of a target with a certain boundary. First, the method
is applied to a single code marker; the angle and scaling are valid. Then, the paper introduces the multi code markers matching
method by the inertia ellipse. Rotation and scaling changes of homonymy images can be calculated by inertia ellipse algorithm.
These parameters can be used for code marker matching in arbitrary attitude close-range photogrammetry. 相似文献
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Feng Wenhao 《地球空间信息科学学报》2013,16(3):50-56
Close-range photogrammetry is to determine the shape and size of the object, instead of it's absolute position. Therefore, at first, any translation and rotation of the photogrammetric model of the object caused by whole geodesic, photographic and photogrammetric procedures in close-range photogrammetry could not be considered. However, it is necessary to analyze all the reasons which cause the deformations of the shape and size and to present their corresponding theories and equations. This situation, of course, is very different from the conventional topophotogrammetry. In this paper some specific characters of limit errors in close-range photogrammetry are presented in detail, including limit errors for calibration of interior elements for close-range cameras, the limit errors of relative and absolute orientations in close-range cameras, the limit errors of relative and absolute orientations in close-range photogrammetric procedures, and the limit errors of control works in close-range photogrammetry. A theoretical equation of calibration accuracy for close-range camerais given. Relating to the three examples in this paper, their theoretical accuracy requirement of interior elements of camera change in the scope of ±(0.005–0.350) mm. This discussion permits us to reduce accuracy requirement in calibration for an object with small relief, but the camera platform is located in violent vibration environment. Another theoretical equation of relative RMS of base lines (mS/S) and the equation RMS of start direction are also presented. It is proved that themS/S could be equal to the relative RMS ofmΔX/ΔX. It is also proved that the permitting RMS of start direction is much bigger than the traditionally used one. Some useful equations of limit errors in close-range photogrammetry are presented as well. Suggestions mentioned above are perhaps beneficial for increasing efficiency, for reducing production cost. 相似文献
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FENG Wenhao 《地球空间信息科学学报》2001,4(3):50-56
1 IntroductionTheapplicationofclose_rangephotogrammetryistodeterminetheformandsize ,ratherthantheab soluteposition ,ofanobjectinthefieldofarchitec ture ,industryandbiomedicine .Anyintegraltrans lationandrotationcausedbydifferentoperationprocessinclose_rang… 相似文献