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针对海岸带和海岛(礁)稀少地面控制区域控制条件不足和定位精度较低等情况,将水边线等高条件与有理函数模型(RFM)相结合,充分利用海岸带卫星影像的特点,将水边线等高点引入平差,提出了一种基于水边线等高的海岸带稀少地面控制卫星影像定位方法。实验结果表明,在同样稀少地面控制情况下,该方法与未加入等高控制条件的海岸带卫星影像定位方法相比,高程定位精度有了明显的提高;在离海岛较近的大陆岸边布设控制点,利用本文方法同样可以在海岛获取较高的定位精度。这对于稀少地面控制条件下海岸带、海岛(礁)地理信息的精确获取,具有重要意义。 相似文献
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基于海岸带高分辨率信息需求理论支持下的信息挖掘技术,面对我国海岸带可持续发展的需求,以中高分辨率遥感影像为数据源,以滩涂、水边线、海堤、养殖场等海岸带地物为专题信息挖掘提取实例,建立了"像元→基元→目标"的识别方法体系,针对面向对象的信息提取分析方法进行研究。即首先通过采用光谱和形状相结合的分割算法来获取内部特征相对均一的一系列基元对象,再通过对基元对象的典型特征进行分析和判别来实现目标提取。结果表明,该方法是可行的,它提高了遥感影像信息的识别精度,为动态性很强的海岸带地物信息挖掘提取提供了研究思路,在海岸带监测、管理、开发和利用,编制现实性很强的海岸带专题图等应用领域展现了该研究示例的科学性和实际意义。 相似文献
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基于Sentinel-2A卫星数据面向对象的水边线提取——以如东县为例 总被引：1，自引：0，他引：1
使用基于面向对象的方法提取水边线, B分量作为阈值分割条件, Sentinel-2A数据作为提取水边线的影像,通过多尺度分割与光谱差异分割组合的方式。对如东沿海的淤泥质海岸、交通围堤海岸和养殖围堤海岸3种不同类型的海岸水边线进行提取。通过提取的水边线与影像叠加,并对受潮汐影响较小的水边线做精度验证。总体来说,提取的水边线较为准确。水边线的快速准确提取,对监测海岸带动态变化具有重要意义。 相似文献
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海面影像的纹理信息少、匹配精度低致使现有的相对定向方法误差大,稳定性差;通过对其进行改进,有效地提高了相对定向参数标定的精度和稳定性。文中建议了几何模型,并以共面方程为控制方程,采用附有参数的条件平差法计算相对定向参数,同时发展了初始值计算方法,保证了迭代的收敛性。从两个方面入手提高相对定向参数标定的精度和稳定性,并给出了详细的计算流程:1)在摄影区域内近似均匀的选取特征点,并采用高精度的匹配方法进行影像匹配;2)在大量的共轭点对(不低于1 000个)中选取最优匹配点(不低于300个)进行相对定向参数计算。海面实测数据分析时通过迭代的方式在1 200个共轭点中逐渐剔除了粗差点和误差较大点,最终得到了由321个最优匹配共轭点计算出的精确相对定向参数,检验了所述方法的可行性。该研究解决了相对定向标定精度低、稳定性差的问题,提高了立体摄影海浪测量技术的可靠性,有利于其推广和应用。 相似文献
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遥感水边线技术在潮间带冲淤分析研究中的应用 总被引：4，自引：0，他引：4
以辽东湾盘锦滩为试验区,利用遥感水边线方法研究了潮间带的冲淤演变,结合遥感水边线和海图0m线边界建立了3个时段的潮滩数字高程模型,获得了辽东湾盘锦滩不同时段近20a来的冲淤空间变化,并用2008年实测地形资料对遥感水边线和反演地形进行了评价。研究结果表明,从Landsat5,4,2合成彩色影像上目视解译的水边线与实测地形走向相近;实测地形与反演地形之间的误差集中在-0.9m～0.8m之间,平均误差为-0.16m,标准偏差为0.40,误差在±0.6m之间的区域占总面积的81.1%。遥感技术作为一种补充手段,可用于潮间带岸滩演变空间分析,其精度有待于进一步提高。 相似文献
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阐述了GPS/IMU系统进行位置与姿态测量的基本原理,推导了利用GPS/IMU的导航解计算遥感器瞬时外方位元素的数学模型,并利用机载三线阵影像验证了GPS/IMU辅助直接对地定位的精度潜力。三组ADS40数据直接定位的试验结果表明,GPS/IMU提供的外方位元素具有较高的定位精度,平面精度优于2.5个像元,高程优于5.1个像元,但存在系统性的测量误差,在大比例尺遥感测绘作业中引入少量控制点参与平差仍是必须的。 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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A novel automated trinocular stereo imaging system (ATSIS) is developed for non-intrusively measuring the temporal evolution of three-dimensional wave characteristics. The system consists of three progressive digital cameras to provide three independent stereo-pairs, i.e. left–right, left–center, and center–right, for accurately estimating depth of a scene. A third camera assists to resolve correspondence problems due to specular reflection on the water surface and provides additional constraints on image matching, dramatically reducing the chance of a mismatch. An oblique configuration for the trinocular system effectively increases spatial coverage, allowing observations of wave phenomena over a broad range of spatial scales. The height resolution is increased with the optical axes of the cameras pointed at an oblique angle with respect to vertical surface wave displacements. A new exterior calibration procedure is developed in this paper to determine the orientation of cameras in the field. Field experiments demonstrate that ATSIS can robustly measure hundreds of matched image points in seconds, allowing fast extraction of the temporal evolution of a three-dimensional surface wave field. 相似文献
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近年来，随着我国海洋开发利用规模的持续增长，不同项目重叠用海的问题开始凸显，海域立体分层使用模式得到广泛关注。海域立体分层使用以海域的立体性、多宜性等自然属性为基础，以协调竖向空间的用海活动为目的，是未来海洋空间管理制度体系变革的方向之一。现行的海域空间“平面化”管理思路，使海域立体分层使用面临竖向空间边界不清、二维海籍管理模式不适用、缺少立体空间规划及利益相关者协调难度大等问题。通过借鉴土地立体分层使用的经验，结合海域空间自然特征与开发利用特点，分别从海域分层方法、三维海籍信息表达方式、海域立体空间规划、设立海域役权等方面提出对策建议，以期为海域空间立体分层使用提供借鉴。 相似文献
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Rongxing Li Sagar Deshpande Xutong Niu Feng Zhou Kaichang Di Bo Wu 《Marine Geodesy》2013,36(3):143-159
This paper investigates the geopositioning accuracy achievable from integrating IKONOS and QuickBird satellite stereo image pairs with aerial images acquired over a region at Tampa Bay, Florida. The results showed that the accuracy is related to a few factors of imaging geometry. For example, the geopositioning accuracy of a stereo pair of IKONOS or QuickBird images can be improved by integrating a set of aerial images, even just a single aerial image or a stereo pair of aerial images. Shorelines derived from the IKONOS and QuickBird stereo images, particularly the vertical positions, are compared with the corresponding observations of water-penetrating LiDAR and water gauge stations and proved that differences are within the limit of the geopositioning uncertainty of the satellite images. 相似文献
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Image analysis techniques are used for retrieving water surface elevation fields spatially and temporally from CCD-images and CCD-image-sequences. The technique proposed herein utilizes binocular stereogrammetry to recover topographic information from a sequence of synchronous, overlapping video images. The method used differs from the traditional stereo-photogrammetric analysis of a single stereo-pair because the use of video allows for a continuous sequence of stereo-images to be digitally sampled and analyzed. For data acquisition two synchronized progressive-scan cameras were used.A partially supervised 3-D stereo system (called WASS, Wave Acquisition Stereo System) is shown here. It is used to reconstruct the 3-D shape of water surface waves, acquired at frame rate, with small computational time needed. The stereo method is presented, including the derivation of a relationship relating the geometry of the stereo rig and the expected errors. Finally, the 3-D calculated scattered points give the complete spatio-temporal distribution of the water surface elevations. The measurable length-scales depend on the pixel resolution, the triangulation accuracy, and the acquisition frame rate. Limitations in the stereo measurements are also discussed.Two experiments to test and to demonstrate the system took place: one on the Venice lagoon, north of the city of Venice in September 2004 and the second on the coast of California at San Diego in December 2005. For the second experiment, qualitative and quantitative intercomparisons of the stereo-matching and in-situ sensor measurements are presented. All the measurements of water surface waves indicate that the proposed approach is both accurate and applicable for measuring water surface waves. Moreover, shape estimates are accurately and extremely dense both in space and time, and the remote location of the instruments alleviates some difficulties associated with in situ instrumentation. 相似文献