Clay capped waste sites are a common method to dispose of the more than 40 million tons of hazardous waste produced in the United States every year (EPA, 2003). Due to the potential threat that hazardous waste poses, it is essential to monitor closely the performance of these facilities. Development of a monitoring system that exploits spectral and topographic changes over hazardous waste sites is presented. Spectral anomaly detection is based upon the observed changes in absolute reflectance and spectral derivatives in centipede grass (Eremochloa ophiuroides) under different irrigation levels. The spectral features that provide the best separability among irrigation levels were identified using Stepwise Discriminant Analyses. The Red Edge Position was selected as a suitable discriminant variable to compare the performance of a global and a local anomaly detection algorithm using a DAIS 3715 hyperspectral image. Topographical anomaly detection is assessed by evaluating the vertical accuracy of two LIDAR datasets acquired from two different altitudes (700 m and 1,200 m AGL) over a clay-capped hazardous site at the Savannah River National Laboratory, SC using the same Optech ALTM 2050 and Cessna 337 platform. Additionally, a quantitative comparison is performed to determine the effect that decreasing platform altitude and increasing posting density have on the vertical accuracy of the LIDAR data collected.
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机译:粘土覆盖的废物场是处理美国每年产生的4000万吨以上危险废物的常用方法(EPA,2003年)。由于危险废物构成的潜在威胁,因此必须密切监视这些设施的性能。提出了开发利用危险废物现场的光谱和地形变化的监测系统的方法。光谱异常检测是基于观察到的在不同灌溉水平下cent草(Eremochloa ophiuroides)中绝对反射率和光谱导数的变化。使用逐步判别分析确定了在灌溉水平之间可提供最佳分离性的光谱特征。选择“红色边缘位置”作为合适的判别变量,以比较使用DAIS 3715高光谱图像的全局和局部异常检测算法的性能。通过使用相同的Optech ALTM 2050和塞斯纳评估在萨凡纳河国家实验室的粘土覆盖的危险场所从两个不同高度(700 m和1,200 m AGL)的两个不同高度获得的LIDAR数据集的垂直精度,评估了地形异常检测337平台。此外,执行定量比较以确定降低平台高度和增加发布密度对收集的LIDAR数据的垂直精度的影响。
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