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相关概念视频

Areas Within Irregular Boundaries01:26

Areas Within Irregular Boundaries

47
Calculating areas within irregular boundaries, such as along rivers or curved roads, is crucial in various fields, including surveying, engineering, and environmental management. Surveyors often begin by creating a traverse, a connected series of straight lines approximating the area's boundary. The coordinates of each traverse point are essential for calculating the enclosed area. The double meridian distance formula is a widely used technique for this purpose. This method utilizes the...
47
Design Example: Maintaining Level of an Embankment01:19

Design Example: Maintaining Level of an Embankment

34
Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
34
Distance Corrections01:15

Distance Corrections

18
To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
18
Common Leveling Mistakes and Errors01:17

Common Leveling Mistakes and Errors

40
A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
40
Design Example: Measuring Distance Between Two Points with Obstructions01:10

Design Example: Measuring Distance Between Two Points with Obstructions

17
When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
17
Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

26
Flood risk assessment involves careful planning and analysis to ensure the safety of communities near water retention structures. Capacity contours are a vital tool in this process, as they illustrate the potential spread of water at specific levels in a given area. In the context of building a bund across a small valley, these contours play a critical role in evaluating the safety of nearby residential areas.In this example, the bund is intended to store stormwater in the valley. The engineers...
26

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Laboratory and Field Protocol for Estimating Sheet Erosion Rates from Dendrogeomorphology
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滑坡厚度估计的规范化方法

Lisa Borgatti1, Davide Donati1, Liwei Hu2

  • 1Department of Civil, Chemical, Environmental, and Materials Engineering, University of Bologna, 40136 Bologna, Italy.

Journal of imaging
|December 27, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新方法,利用卫星海拔数据和质量保护原则来估计山体滑坡深度. 该方法准确地重建了山体滑坡厚度,有助于危险评估和降低风险.

关键词:
平衡原则 (BP) 适用于规范化关于大质量保存法的 дискретизации.反向问题正规化问题土地滑坡深度估计估计合成数据集的准备过程

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科学领域:

  • 地质科学 地质科学
  • 遥感 遥感 遥感 遥感
  • 地质物理危险评估

背景情况:

  • 准确的山体滑坡深度估计对于有效的危险评估和风险减轻至关重要.
  • 来自卫星的海拔数据为地质分析提供了有价值的,非侵入性的来源.
  • 传统的山体滑坡深度测定方法可能具有挑战性和资源密集性.

研究的目的:

  • 开发和验证一种新的方法,通过卫星获得的海拔数据来确定山体滑坡深度.
  • 用规范化技术解决的线性反向问题来制定山体滑坡深度问题.
  • 通过合成和现实世界的数据来评估拟议方法的稳定性和实际适用性.

主要方法:

  • 土地滑坡深度估计的表述作为基于质量保存原理的线性反向问题.
  • 应用正规化方法,利用平衡原理,计算近似解决方案和正规化参数.
  • 合成山体滑坡数据的生成和利用,在受控噪声条件下严格评估方法性能.
  • 使用来自阿拉斯加费尔斯山滑坡的真实世界滑坡数据验证该方法.

主要成果:

  • 拟议的规范化方法成功计算了滑坡深度的近似解决方案.
  • 该方法在与合成数据进行测试时,在各种噪声水平上显示出稳定性.
  • 对费尔斯山滑坡的滑坡厚度模式的重建显示与现有的地质解释有很好的一致性.
  • 均衡原则有效地确定了准确的反向问题解决方案的规范化参数.

结论:

  • 开发的方法提供了一种实用和有效的方法,用于从卫星海拔数据中估计山体滑坡深度.
  • 这种方法为加强滑坡危险评估和风险减轻策略提供了有价值的工具.
  • 对现实数据的成功应用证实了该方法在地质环境中的实用性.