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首页> 外文期刊>Estuarine Coastal and Shelf Science >A simple waterline approach for tidelands using multi-temporal satellite images: A case study in the Yangtze Delta
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A simple waterline approach for tidelands using multi-temporal satellite images: A case study in the Yangtze Delta

机译：一种使用多时相卫星图像的潮汐水线简单方法：以长江三角洲为例

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Waterline technique based on satellite remote sensing is potentially one of the most effective tools for studying changes in tidal flat environment and coastlines. However, multi-temporal waterlines obtained from satellite images are often difficult to compare directly because fluctuant tidal conditions may produce different elevation of waterlines. To overcome the difficulty, this study developed a comparable waterline solution to estimate active lateral evolutions using TM satellite images at different tide conditions. Owing to the dynamic properties, the Yangtze River mouth was selected as the case example to test the suitability of the approach, and totally four time slices were partitioned during 1987-2004 for investigating coastline changes. The first step of this technique is to digitize waterlines with various elevations labeling in a time slice. In the second step, the waterlines were merged to generate DEMs and contour maps using the linear gridding interpolation method. In the last step, any interested contour line may be extracted from DEMs and used for comparison of tideland changes. To evaluate the errors in digitizing and interpolation process, quantitative checks were examined after the DEMs were constructed. In order to monitoring the rate of coastline spread, a proposed approach for estimating mean coastline spread distance between two time spans is developed in this paper. To conclude, this work demonstrates the importance of TM/ETM images to provide high-frequency historical topography and morphodynamics information for coastal monitoring and evaluation.
机译：基于卫星遥感的水线技术可能是研究潮滩环境和海岸线变化的最有效工具之一。但是，由于潮汐条件的波动可能会产生不同高度的水线，因此通常很难直接比较从卫星图像获得的多时间水线。为了克服这一困难，本研究开发了一种可比较的水线解决方案，可以使用TM卫星图像在不同的潮汐条件下估算活跃的横向演化。由于其动态特性，以长江口为例来测试该方法的适用性，并在1987-2004年间共划分了四个时间段来研究海岸线变化。该技术的第一步是数字化在时间片中标注有不同海拔高度的水线。第二步，使用线性网格插值方法合并水线，以生成DEM和轮廓图。在最后一步中，可以从DEM中提取任何感兴趣的轮廓线，并将其用于比较潮地变化。为了评估数字化和内插过程中的错误，在构建DEM之后检查了定量检查。为了监测海岸线的扩散速度，本文提出了一种估计两个时间跨度之间的平均海岸线扩散距离的方法。总而言之，这项工作证明了TM / ETM图像对于为沿海监测和评估提供高频历史地形和形态动力学信息的重要性。

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