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首页> 外文期刊>Journal of great lakes research >Determining remote sensing spatial resolution requirements for the monitoring of harmful algal blooms in the Great Lakes
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Determining remote sensing spatial resolution requirements for the monitoring of harmful algal blooms in the Great Lakes

机译：确定监测大湖中有害藻华的遥感空间分辨率要求

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Harmful algal blooms (HABs) have become a major health and environmental concern in the Great Lakes. In 2014, severe HABs prompted the State of Ohio to request NASA Glenn Research Center (GRC) to assist with monitoring algal blooms in Lake Erie. The most notable species of HAB is Microcystis aeruginosa, a hepatotoxin producing cyanobacteria that is responsible for liver complications for humans and other fauna that come in contact with these blooms. NASA GRC conducts semiweekly flights in order to gather up-to-date imagery regarding the blooms' spatial extents and concentrations. Airborne hyperspectral imagery is collected using two hyperspectral imagers, HSI-2 and HSI-3. Hyperspectral imagery is necessary in order to conduct experiments on differentiation of algal bloom types based on their spectral reflectance. In this analysis, imagery from September 19, 2016 was utilized to study the subpixel variability within the footprint of arbitrary sized pixels using several analysis techniques. This particular data set is utilized because it represents a worst case scenario where there is significant potential for public health concern due to high concentrations of microcystin toxin found in the water on this day and the concurrent observational challenges to accurately measure the algal bloom concentration variability with a remote sensing system due to the blooms high spatial variability. It has been determined that the optimal spatial resolution to monitor algal blooms in the Great lakes is at most 50 m, and for much lower error 25 m, thus allowing for greater ease in identifying high concentration blooms near the surface. This resolution provides the best sensitivity to high concentration areas that are of significant importance in regard to human health and ecological damage. Published by Elsevier B.V. on behalf of International Association for Great Lakes Research.
机译：有害藻华（HABs）已成为大湖区主要的健康与环境问题。 2014年，严重的HAB促使俄亥俄州政府要求NASA格伦研究中心（GRC）协助监测伊利湖的藻华。 HAB最著名的物种是铜绿微囊藻，一种产生肝毒素的蓝细菌，负责与这些花接触的人类和其他动物的肝脏并发症。 NASA GRC每半周飞行一次，以收集有关大花的空间范围和集中度的最新图像。使用两个高光谱成像仪HSI-2和HSI-3收集机载高光谱成像。为了对基于藻类水华的光谱反射率进行区分进行实验，需要高光谱成像。在此分析中，利用几种分析技术，利用2016年9月19日以来的图像研究了任意大小像素占位面积内的亚像素变化。使用此特定数据集是因为它代表了最坏的情况，由于这一天在水中发现了高浓度的微囊藻毒素，因此存在严重的公共卫生隐患，并且同时存在观察上的挑战，难以准确测量藻华浓度的变化。盛开的遥感系统具有很高的空间变异性。已经确定，在大湖中监测藻华的最佳空间分辨率最大为50 m，而对于更低的误差为25 m，因此可以更轻松地识别地表附近的高浓度华藻。该决议对对人类健康和生态破坏至关重要的高浓度地区提供了最佳灵敏度。由Elsevier B.V.代表国际大湖研究协会出版。

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