Using Alternatives to Determine the Shallowest Depth for Bathymetric Charting: Case Study

IF 1.8 3区 工程技术 Q3 ENGINEERING, CIVIL
T. H. Mohammadloo, M. Snellen, D. Simons, B. Dierikx, S. Bicknese
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引用次数: 4

Abstract

Methods for gridding multibeam echo sounder (MBES) measurements to equidistant grids are proposed as alternatives to the shallowest measured depth, which is affected by outliers. The approaches considered use a combination of mean and standard deviation of soundings and the regression coefficient from the best fitted plane. These methods along with mean and shallowest depths were applied to two surveyed areas. Two issues were found to be of importance, that is, a proper distribution of soundings and low uncertainties in the depth measurements. Improper sampling excludes using the method employing regression coefficients. For flat areas, the shallowest measured depth was found to be highly influenced by measurement uncertainties, counteracted when using the mean depth. However, the mean depth underestimates the shallowest depth for areas with slopes. When correcting the mean depth for standard deviation, the effect of slopes is accounted for while the influence of measurement uncertainties is decreased compared to shallowest measured depth. Since the uncertainties are dependent on beam angle, depth, and measurement equipment, these issues need to be accounted for in survey planning.
使用备选方案确定水深图的最浅深度:案例研究
提出了将多波束测深(MBES)测量数据网格化到等距网格的方法,以替代受离群值影响的最浅测量深度。所考虑的方法使用探测的平均值和标准差以及最佳拟合平面的回归系数的组合。这些方法与平均深度和最浅深度一起应用于两个调查区域。发现两个重要的问题,即合理的测深分布和深度测量的低不确定性。不适当的抽样排除使用回归系数的方法。对于平坦区域,发现最浅的测量深度受到测量不确定度的高度影响,在使用平均深度时被抵消。然而,对于有坡度的地区,平均深度低估了最浅深度。在对平均深度进行标准差校正时,考虑了坡度的影响,而与最浅测量深度相比,测量不确定性的影响减小了。由于不确定性取决于波束角度、深度和测量设备,因此需要在调查计划中考虑这些问题。
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来源期刊
Journal of Surveying Engineering
Journal of Surveying Engineering 工程技术-工程:土木
CiteScore
3.40
自引率
10.50%
发文量
29
审稿时长
>12 weeks
期刊介绍: The Journal of Surveying Engineering covers the broad spectrum of surveying and mapping activities encountered in modern practice. It includes traditional areas such as construction surveys, control surveys, photogrammetric mapping, engineering layout, deformation measurements, precise alignment, and boundary surveying. It also includes newer development such as satellite positioning; spatial database design, quality assurance, and information management of geographic information systems; computer applications involving modeling, data structures, algorithms, and information processing; digital mapping, coordinate systems, cartographic representations, and the role of surveying engineering professionals in an information society.
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