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相关概念视频

Distance Corrections01:15

Distance Corrections

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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...
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Collisions in Multiple Dimensions: Problem Solving01:06

Collisions in Multiple Dimensions: Problem Solving

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In multiple dimensions, the conservation of momentum applies in each direction independently. Hence, to solve collisions in multiple dimensions, we should write down the momentum conservation in each direction separately. To help understand collisions in multiple dimensions, consider an example.
A small car of mass 1,200 kg traveling east at 60 km/h collides at an intersection with a truck of mass 3,000 kg traveling due north at 40 km/h. The two vehicles are locked together. What is the...
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Generalized Hooke's Law01:22

Generalized Hooke's Law

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The generalized Hooke's Law is a broadened version of Hooke's Law, which extends to all types of stress and in every direction. Consider an isotropic material shaped into a cube subjected to multiaxial loading. In this scenario, normal stresses are exerted along the three coordinate axes. As a result of these stresses, the cubic shape deforms into a rectangular parallelepiped. Despite this deformation, the new shape maintains equal sides, and there is a normal strain in the direction of the...
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Elastic Collisions: Case Study

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Elastic collision of a system demands conservation of both momentum and kinetic energy. To solve problems involving one-dimensional elastic collisions between two objects, the equations for conservation of momentum and conservation of internal kinetic energy can be used. For the two objects, the sum of momentum before the collision equals the total momentum after the collision. An elastic collision conserves internal kinetic energy, and so the sum of kinetic energies before the collision equals...
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Coplanar Forces01:25

Coplanar Forces

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Consider an object upon which multiple forces are acting. If the lines of action of each force lie within the same plane, the system can be considered coplanar. The Cartesian vector form can be used to resolve each force into its respective components. For a coplanar system, the system will be in equilibrium if each component of the resultant force equals zero and the resultant force on the system is zero. If the sum of the forces is not equal to zero, then the object will not be in equilibrium...
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Electrostatic Boundary Conditions

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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相关实验视频

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Operation of the Collaborative Composite Manufacturing CCM System
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一个基于物理的对邻近效应的一般化纠正.

Alexandre Castagna, Quinten Vanhellemont

    Applied optics
    |August 12, 2025
    PubMed
    概括

    一个新的基于物理的处理器,TSDSF + RAdCor在ACOLITE中,提高了对卫星图像的表面反射率检索精度,特别是在小内陆水域. 它在可见光线范围内表现优于其他处理器,但在近红外线中显示出混合的结果.

    科学领域:

    • 遥感 遥感 遥感 遥感
    • 大气光学是大气光学.
    • 地理空间分析的研究.

    背景情况:

    • 大气散射 (相邻效应) 模糊了卫星信号,降低了表面反射率检索的准确性.
    • 这种效应对于水域遥感至关重要,因为陆水对比度很高,水体尺寸很小.
    • 现有的处理器在精确的表面反射率检索方面扎,特别是在复杂的幕后组合中.

    研究的目的:

    • 介绍一种基于物理学的新型处理器 (TSDSF + RAdCor),用于在所有表面类型中准确的表面反射率检索.
    • 在ACOLITE软件中实现和评估Landsat 8 (OLI) 和Sentinel-2 (MSI) 传感器的处理器.
    • 评估处理器在内陆和沿海水生生物遥感应用中的性能.

    主要方法:

    • 开发了一种由两个模块组成的处理器:TSDSF用于气溶属性估计,RAdCor用于表面反射率检索.
    • 在开源ACOLITE软件中实现了处理器.
    • 使用OLI和MSI数据对比比利时小内陆水域的验证性能,与现场数据和其他加工商 (C2RCC,POLYMER,Sen2Cor,iCOR,ACOLITE/DSF,LaSRC) 进行比较.

    主要成果:

    • TSDSF + RAdCor处理器在可见波段中显示出更好的准确性 (OLI的偏差为6-18%,MSI的偏差为14-31%).

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  • 在近红外波段 (70-150%偏差) 的性能有所不同,但有显著的例外.
  • 新的处理器在可见光范围内表现优于大多数其他处理器,但在近红外范围内被C2RCC和POLYMER所超越.

    • 结论:

    • TSDSF + RAdCor处理器为表面反射率检索提供了一个强大的解决方案,特别有利于水域遥感.
    • 提供了ACOLITE中处理器最佳使用的建议.
    • 对于所有传感器和条件的近红外波段精度,可能需要进一步的细化.