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Use of Satellite Remote Sensing in Monitoring Saltcedar Control along the Lower Pecos River, USA

机译:利用卫星遥感监测美国下佩科斯河沿岸的Saltcedar控制

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摘要

Vegetation along the riparian corridor of the lower Pecos River in the United States hasbeen dominated by saltcedar for the past century. In 1999 through 2004, herbicides weresprayed from helicopters along some sections of the river to reduce saltcedar infestation. Herewe describe a simple methodology based on satellite remote sensing for monitoring the impact ofthe saltcedar control measures. Data from the Landsat 7 Enhanced Thematic Mapper Plus(ETM+) and the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)obtained in 1999 through 2004 over a section of the Pecos near Mentone, Texas were used forthe present study. Herbicides were applied in September of each year. A normalized differencevegetation index (NDVI) image was derived from the satellite data for one growing season, andthen it was compared to an NDVI image from the previous year. Using the write memoryinsertion change detection technique, we superimposed the NDVI image pair. Thesuperimposed image highlighted areas where vegetation was lost during the interval between thetimes when the two satellite data sets were acquired. The areas of vegetation loss indicated bythe change detection image coincided well with the areas where herbicides were applied in thesame time interval. Since the riparian vegetation previously was dominated by saltcedar,identifying the areas of vegetation loss in this case is useful in assessing the long-term impact ofthe herbicide treatments. The same type of change detection technique was also used to locateareas of native vegetation recovery after the herbicide application.
机译:在过去的一个世纪中,美国佩科斯河下游河岸走廊的植被一直被硝化雪松所控制。从1999年到2004年,沿河的某些地区从直升机上喷洒了除草剂,以减少盐杉的出没。在此,我们描述了一种基于卫星遥感的简单方法,用于监视盐杉控制措施的影响。本研究使用了1999年至2004年在得克萨斯州Mentone附近的Pecos上获得的Landsat 7增强型专题制图仪Plus(ETM +)和先进的星载热发射与反射辐射计(ASTER)的数据。除草剂在每年的9月使用。从一个生长季节的卫星数据得出归一化差异植被指数(NDVI)图像,然后将其与上一年的NDVI图像进行比较。使用写存储器插入变化检测技术,我们叠加了NDVI图像对。叠加的图像突出显示了在获取两个卫星数据集之间的时间间隔内植被消失的区域。变化检测图像指示的植被损失面积与在相同时间间隔内施用除草剂的面积非常吻合。由于以前河岸植被主要由盐杉控制,因此在这种情况下确定植被损失的区域有助于评估除草剂处理的长期影响。在使用除草剂后,还使用了相同类型的变化检测技术来定位自然植被恢复的区域。

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