共查询到19条相似文献，搜索用时 93 毫秒
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声速误差是多波束水深地形测量主要误差源之一,通常采用现场声速剖面测量的方式加以改正,但在深远海多波束水深地形测量时,现场获取全深度的声速剖面并非易事。针对这一问题,利用东南印度洋海洋调查工作中采集到的17个站位的CTD数据,将所有站位声速剖面拓展到全深度,采用经验正交函数分析法(Empirical Orthogonal Functions,EOF)构建调查区声速剖面场,可获得声速剖面场内任意一点的声速值。然后通过EOF重构声速剖面场获得的声速值对测区内多波束水深地形数据进行改正,并与实测声速剖面对多波束水深地形数据的改正结果进行对比,结果表明,5000 m水深范围内2种声速改正结果相差很小,EOF重构法对深水多波束的声速改正满足水深测量的要求。 相似文献
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多波束勘测的特殊地形处理 总被引：1，自引：2，他引：1
海底特殊地形在多波束勘测后处理时经常遇到但又极易被忽视，导致具有重要地学和工程意义的特殊地形未能被反映在成果图上。通过分析后处理中的常见问题，提出了利用水深残差法搜索定位多波束海量数据中存在的局部特殊地形，进而提取特殊地形的水深浅点和深点的处理方法。该方法在国家海洋勘测专项中取得了很好的应用效果。 相似文献
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CUBE算法及其在多波束数据处理中的应用 总被引：5，自引：0，他引：5
阐述了一种基于表面生成的多波束数据处理方法——CUBE(Combined Uncertainty and Bathymetry Estimator)算法,用该方法可以对观测区域网格节点"真实"水深及相关误差进行估计。与从测量水深中选择出"最佳"数据的手工交互方式的多波束数据编辑手段不同,CUBE算法具有很强的抗差性和较高的效率,适合于实时多波束数据处理。对南海某测区多波束数据处理结果表明,在没有人工干预的情况下,利用CUBE算法去噪生成的海底DTM图与手工编辑生成的相当吻合。CUBE算法和手工编辑方法综合对比得出,CUBE算法能够很好地保留水深地形细节,在计算效率、误差评估、实时处理等方面比手工编辑方法具有较大的优势。 相似文献
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深水多波束声呐测深数据精度评估 总被引：1，自引：0，他引：1
多波束测深精度评估是水深测量质量控制的重要方面，静态精度评估与交叉测线动态精度评估能够从不同角度表征测深精度，估计测量样本的综合误差。在实际调查作业过程中，由于缺少水深真值，在进行精度估计时缺少可操作性。本文利用Kongsberg EM120型深水多波束系统的测深数据，基于某一区域的重复测量数据，应用中央波束的水深数据进行静态精度分析；通过引入网格化方法，进行动态水深精度评估分析，并通过偏差分析揭示测量样本的误差分布特征。结果表明，中央波束水深数据静态精度评估与基于网格化方法的动态精度评估具有实际可操作性，其结果能够有效估计测深的综合误差；重复测量数据的偏差分析能够有效展示误差的分布特征。 相似文献
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针对重点的特殊深海研究区（如热液冷泉、洋中脊区域），在船载多波束数据获得研究区大面积地形资料的基础上，有必要选取典型深海小靶区进行高分辨率地形测量为进一步深入研究提供保障。根据船载多波束实测数据选取PACMANUS热液区作为靶区，基于长基线定位，利用“发现”ROV搭载多波束系统进行近海底全覆盖地形测量。结果表明，依托于船动力定位系统及差分GPS，长基线为ROV提供了可靠的高精度定位，使得近海底测量的地形数据分辨率数倍优于船载多波束测得的地形数据的分辨率。高分辨率地形清晰的显示了PACMANUS热液区锥形丘体等特殊微地形，与已发现的热液点和火山区有很好的对应。进一步分析发现，该区域活动的热液区主要发育于坡度大于30°斜坡上的地形突变区，其成因仍需深入研究。利用ROV搭载多波束近底测量是获取深海小靶区高分辨率地形的可靠途径和方法，有利于提高深海海底研究的针对性，将促进我国深海科学研究的发展。 相似文献
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针对大型多波束地形调查中存在的多波束测量重叠区和接边区水深的不一致,研究了多波束测量重叠区和接边区的多波束数据的融合方法,分别采用反距离加权法、移动平均法和最小曲率法进行数据融合,比较3种方法的融合精度,认为最小曲率法是这3种方法中最适合用来进行重叠区多波束数据融合的方法. 相似文献
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Remote sensing bathymetry inversion can quickly obtain water depth data of large areas, but this process relies on a large number of in-situ depth data points. USV-based (Unmanned Surface Vehicle) technique can obtain the bathymetry data of shallow water where ordinary ships are inaccessible, but this technique is inefficient and generally only data along survey line can be collected. The combination of USV and high-resolution remote sensing provides a new solution for water depth surveying and mapping around an island. This paper focuses on the key techniques, using USV sounding data and GeoEye-1 multispectral remote sensing images covering the region of Wuzhizhou island in the experiment. The results show that the MAE (Mean Absolute Error) of USV sounding is 0.25 m, while the MRE (Mean Relative Error) is 1.41%, and the MRE of remote sensing bathymetry aided by USV sounding can be controlled within 20%. Errors are mainly from areas shallower than 5 m, and are also affected by the USV sounding position accuracy. It shows that it is feasible to combine the USV sounding and high-resolution remote sensing bathymetry, and this technique has broad application prospects in the field of bathymetry in large shallow areas. 相似文献
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针对浅海测深的数据特点和应用需求,以我国南海甘泉岛为例,研究了利用ICESat-2(Ice,Cloud,and Land Elevation Satellite-2)激光卫星数据和光学遥感影像开展主被动融合水深测量的方法。首先通过信号点提取、水面/水底识别、水下点折射改正等步骤处理ICESat-2数据,获得水深值,随后以激光点作为控制,计算光学水深反演模型参数,最后由点及面地获取大范围高精度水深。实验表明,甘泉岛区域主被动融合测深中误差优于1.30m,基于激光卫星数据的主被动融合测深方法能够为浅水水深测量提供新手段。 相似文献
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Michelle L. McIntyre David F. Naar Kendall L. Carder Brian T. Donahue David J. Mallinson 《Marine Geophysical Researches》2006,27(2):129-136
We present a large-scale quantitative test of a hyperspectral remote-sensing reflectance algorithm. We show that coastal bathymetry
can be adequately derived through model inversions using data from the Airborne Visible-Infrared Imaging Spectrometer instrument.
Data are analyzed from a shore-perpendicular transect 5 km offshore Sarasota, Florida at water depths ranging from 10 m to
15.5 m. Derived bottom depths are compared to a high-resolution multibeam bathymetry survey. Model-derived depths are biased
4.9% shallower than the mean of the multibeam depths with an RMS error of 7.83%. These results suggest that the model performs
well for retrieving bottom depths from hyperspectral data in subtropical coastal areas in water depths ranging from 10 m to
15.5 m. 相似文献
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Seafloor massive sulphides are deep sea mineral deposits currently being examined as a potential mining resource. Conventional sonar bathymetry products gathered by sea surface platforms do not achieve adequate spatial resolution to detect these resources. High-resolution beamforming methods (such as multiple signal classification and estimation of signal parameters via rotational invariance techniques) improve the resolution of sonar bathymetry. We perform a quantitative review of these high-resolution methods using a novel simulator, showing results in the absence of platform motion for a single ping cycle. It was found that high-resolution methods achieved greater bathymetric accuracy and higher resolution than conventional beamforming and that these methods may be adequate for this style of marine exploration. These methods were also robust in the presence of unwanted persistent signals and low signal to noise ratios. 相似文献
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本文基于海浪波折射现象和浅水波理论,提出了一种基于单景高分辨率光学遥感影像的浅海地形提取方法。首先,基于浅水波理论推导出适用于浅海区域的水深与海浪波长、频率的定量关系,针对近岸光学遥感图像复杂的海浪特征,讨论了两种海浪波长提取方法,即FFT方法和剖面线法。然后提出了基于长距离波长波动分析的海浪频率计算方法,解决了单景遥感影像的波浪频率计算难题。最后,利用单景QuickBird高分辨率光学遥感影像,以海南岛三亚湾为研究区域进行了应用实验,结果表明,对12m以浅的浅海区域,在不需要任何辅助参数的情况下,反演获得了浅海地形(DEM),经与1:25000比例尺海图的水深对比验证,地形趋势吻合良好,反演水深的均方根误差为1.07m,相对水深误差为16.2%,表明该方法适合于浅海水下地形的提取,且具有无需实测水深数据和环境参数的支持的优点。 相似文献
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Seafloor acoustic remote sensing with multibeam echo-sounders and bathymetric sidescan sonar systems 总被引：5，自引：0，他引：5
This paper examines the potential for remote classification of seafloor terrains using a combination of quantitative acoustic backscatter measurements and high resolution bathymetry derived from two classes of sonar systems currently used by the marine research community: multibeam echo-sounders and bathymetric sidescans sonar systems. The high-resolution bathymetry is important, not only to determine the topography of the area surveyed, but to provide accurate bottom slope corrections needed to convert the arrival angles of the seafloor echoes received by the sonars into true angles of incidence. An angular dependence of seafloor acoustic backscatter can then be derived for each region surveyed, making it possible to construct maps of acoustic backscattering strength in geographic coordinates over the areas of interest. Such maps, when combined with the high-resolution bathymetric maps normally compiled from the data output by the above sonar systems, could be very effective tools to quantify bottom types on a regional basis, and to develop automatic seafloor classification routines. 相似文献