共查询到18条相似文献,搜索用时 109 毫秒
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简要论述我国以无地面控制点为条件的卫星摄影测量的研究历程,包括第一代、第二代返回式摄影测量卫星,传输型摄影测量演示验证工程和理论研究,同时介绍了在我国月球探测工程所做的工作,并进行带有月球曲率影像的处理研究。 相似文献
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三维激光点云数据具有精度高、数据获取高效、几何信息丰富的优势,在地形数据获取方面起到了越来越重要的作用。但在实际的外业测量中,由于视场角限制,一般都难以获取待测物体完整的点云数据,发生数据缺失现象。而根据摄影测量技术生成密集的影像点云,能获取复杂区域的测量数据。针对三维激光点云数据外业采集缺失的状况,结合影像密集点云特征,提出了一种加入动态迭代因子和分步最优求解尺度的改进尺度迭代最近点(scaling iterative closest point, SICP)算法,对影像点云与三维激光点云进行配准研究。实验结果表明:基于改进的SICP算法提高了影像点云与三维激光点云的配准精度、减少了迭代次数,能有效解决不同源平台获取的点云数据融合问题。 相似文献
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简要介绍了基于数字摄影测量工作站(DPS)制作山东省1∶10 0000数字正射影像图的过程,并对一些关键问题进行研究讨论,证实了用全数字摄影测量系统制作数字正射影像图能有效地节约成本,提高成图质量. 相似文献
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简要介绍了基于数字摄影测量工作站(DPS)制作山东省1:10000数字正射影像图的过程,并对一些关键问题进行研究讨论,证实了用全数字摄影测量系统制作数字正射影像图能有效地节约成本,提高成图质量。 相似文献
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Shorelines are recognized as unique features on Earth. They have valuable properties for a diverse user community. At present, photogrammetry is the most popular technique used to capture a shoreline. With improved resolution and accuracy, commercial high-resolution satellite imagery is demonstrating a great potential in the photogrammetry application domain. One example is the utilization of IKONOS satellite imagery in shoreline extraction. IKONOS panchromatic imagery has a resolution of approximately one meter as well as the capabilities of stereo imaging. This article presents the results of an experiment in which we attempted to improve IKONOS Rational Functions (RF) for a better ground accuracy and to employ the improved RF for 3-D shoreline extraction using 1-meter panchromatic stereo images in a Lake Erie coastal area. Two approaches were investigated. One was to rectify the ground coordinates derived from vendor-provided RF coefficients using ground control points (GCPs). The other was to refine the RF coefficients using the GCPs. We compare the results from these two approaches. An assessment of the shoreline extracted from IKONOS images compared with the existing shoreline is also conducted to demonstrate the potential of the IKONOS imagery for shoreline mapping. 相似文献
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3-D Shoreline Extraction from IKONOS Satellite Imagery 总被引:1,自引:0,他引:1
Shorelines are recognized as unique features on Earth. They have valuable properties for a diverse user community. At present, photogrammetry is the most popular technique used to capture a shoreline. With improved resolution and accuracy, commercial high-resolution satellite imagery is demonstrating a great potential in the photogrammetry application domain. One example is the utilization of IKONOS satellite imagery in shoreline extraction. IKONOS panchromatic imagery has a resolution of approximately one meter as well as the capabilities of stereo imaging. This article presents the results of an experiment in which we attempted to improve IKONOS Rational Functions (RF) for a better ground accuracy and to employ the improved RF for 3-D shoreline extraction using 1-meter panchromatic stereo images in a Lake Erie coastal area. Two approaches were investigated. One was to rectify the ground coordinates derived from vendor-provided RF coefficients using ground control points (GCPs). The other was to refine the RF coefficients using the GCPs. We compare the results from these two approaches. An assessment of the shoreline extracted from IKONOS images compared with the existing shoreline is also conducted to demonstrate the potential of the IKONOS imagery for shoreline mapping. 相似文献
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随着数字三维城市建设的快速推进,传统的纹理获取方法已不能满足快速建模的要求。提出了一种基于航片纹理源的3D空间纹理映射方法,基于摄影测量学相关理论,通过设计算法,实现了建筑物侧面纹理的自动匹配。实验证明,这种方法简单、高效,适用于大面积建筑物3D建模。 相似文献
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The measurement of water wave characteristics, such as wavelength and wave height, in the surf zone is important for monitoring, prediction of erosion, and numerical model calibration. Traditional methods of measuring wave heights have either been limited to a small number of points or have required contact with the water. An experimental study of the remote sensing of water wave elevations, through the application of stereo photogrammetry, is presented. This method uses two spatially offset cameras, with overlapping fields of view, to determine water surface elevation. This remote sensing approach provides data with excellent spatial coverage and spatial and temporal resolution. Additionally, the hardware needs are minimal and the system is quickly deployed, calibrated, and operational. 相似文献