对哨兵-2 和 Planet Super Dove 图像中可勉强探测到的漂浮塑料目标进行实验观测

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引用次数: 0

摘要

遥感应用作为探测、跟踪和监测海洋漂浮垃圾(FML)的一种有前途的解决方案,正在引起广泛关注。随着越来越多的研究表明 FML 检测在技术上是可行的,我们在此尝试在哨兵-2 和 PlanetScope SuperDove 像素中观测漂浮塑料(白色高密度聚乙烯板)的最小可检测丰度分数。这样的阈值可以为基于像素的光谱分类方法设定可探测性基线,尤其适用于地中海东北部等浮游塑料低浓度地区。我们建造并部署了由 1、2 和 3 平方米的白色高密度聚乙烯浮板组成的人工目标。我们获取了目标部署区域的哨兵-2 和超级鸽数据,以及有助于图像解读的辅助数据。数据经过大气校正(ACOLITE v.20221114),并使用光谱角距离度量进行了光谱可分性分析,以评估从光谱上区分 FML 目标和场景中水像素的可能性。结果表明,哨兵-2 卫星的检测阈值在 3 平方米以上,而 SuperDove 卫星的空间分辨率较高,因此 FML 目标与场景中水像素之间的光谱角对 2 平方米和 3 平方米的高密度聚乙烯目标显示出边缘可分性。当使用先前获取的特征码应用部分非混合检测算法时,我们可以在哨兵-2 和 SuperDove 图像中检测到 3 平方米的目标,但会产生佣金误差,使这种低 FML 浓度检测的实际应用可行性受到质疑。
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Experimental observations of marginally detectable floating plastic targets in Sentinel-2 and Planet Super Dove imagery
Remote sensing applications are garnering much attention as a promising solution for detection, tracking and monitoring of floating marine litter (FML). With an increasing number of studies portraying the technical feasibility of FML detection, we attempt here to experimentally observe a minimum detectable abundance fraction of floating plastic (white HDPE sheets), in a Sentinel-2 and PlanetScope SuperDove pixel. Such a threshold can set a baseline for detectability in terms of pixel-based spectral classification methodologies, and can be especially relevant for low-FML-concentration areas such as the Northeastern Mediterranean. We constructed and deployed artificial targets comprising of 1, 2 and 3 m2 of floating white HDPE sheets. We acquired Sentinel-2 and SuperDove data of the target deployment area, along with ancillary data which assists with imagery interpretation. The data is atmospherically corrected (ACOLITE v.20221114) and a spectral separability analysis is performed using the spectral angle distance metric, to assess the possibility of spectrally discriminating the FML targets from water pixels in the scene. Results show that the detection threshold is above 3 m2 for the Sentinel-2 satellite, while the SuperDove’s higher spatial resolution results in spectral angles between the FML targets and water pixels in the scene which show marginal separability for the 2 and 3 m2 HDPE targets. When applying a partial unmixing detection algorithm using a previously acquired signature, we could detect the 3 m2 target in both the Sentinel-2 and SuperDove images, but with commission errors that render the feasibility of practical application of such low FML concentrations detection questionable.
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来源期刊
International journal of applied earth observation and geoinformation : ITC journal
International journal of applied earth observation and geoinformation : ITC journal Global and Planetary Change, Management, Monitoring, Policy and Law, Earth-Surface Processes, Computers in Earth Sciences
CiteScore
12.00
自引率
0.00%
发文量
0
审稿时长
77 days
期刊介绍: The International Journal of Applied Earth Observation and Geoinformation publishes original papers that utilize earth observation data for natural resource and environmental inventory and management. These data primarily originate from remote sensing platforms, including satellites and aircraft, supplemented by surface and subsurface measurements. Addressing natural resources such as forests, agricultural land, soils, and water, as well as environmental concerns like biodiversity, land degradation, and hazards, the journal explores conceptual and data-driven approaches. It covers geoinformation themes like capturing, databasing, visualization, interpretation, data quality, and spatial uncertainty.
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