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首页> 外文期刊>Journal of the American Water Resources Association >MULTI-DECADAL REMOTE-SENSING ANALYSIS OF IRRIGATED AREAS IN THE LOWER RIO GRANDE VALLEY, NEW MEXICO
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MULTI-DECADAL REMOTE-SENSING ANALYSIS OF IRRIGATED AREAS IN THE LOWER RIO GRANDE VALLEY, NEW MEXICO

机译：新墨西哥州下里奥格兰德河谷灌溉地区的多年代遥感分析

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Abstract: A time series of estimates of irrigated area was developed for the Lower Rio Grande valley (LRG) in New Mexico from the 1970s to present day. The objective of the project was to develop an independent, accurate, and scientifically justifiable evaluation of irrigated area in the region for the period spanning from the mid-1970s to the present. These area estimates were used in support of groundwater modeling of the LRG region, as well as for other analyses. This study used a remote-sensing-based methodology to evaluate overall irrigated area within the LRG. We applied a methodology that involved the normalization of vegetation indices derived from satellite imagery to get a more accurate estimation of irrigated area across multiple time periods and multiple Landsat platforms. The normalization allows more accurate evaluation of vegetation index data that span several decades. An accuracy assessment of the methodology and results from this study was performed using field-collected crop data from the 2008 growing season. The comparisons with field data indicate that the accuracy of the remote-sensing-based estimates of historical irrigated area is very good, with rates of false positives (areas identified as irrigated that are not truly irrigated) of only about 4%, and rates of false negatives (areas identified as not irrigated that are truly irrigated) in the range of 0.6-2.0%.
机译：摘要：从1970年代到现在，为新墨西哥州的下里奥格兰德河谷（LRG）建立了灌溉面积的时间序列估计。该项目的目的是针对该地区从1970年代中期到现在的灌溉面积进行独立，准确和科学合理的评估。这些面积估算值用于支持LRG地区的地下水建模以及其他分析。这项研究使用了基于遥感的方法来评估LRG内的整体灌溉面积。我们应用了一种方法，该方法涉及对源自卫星图像的植被指数进行归一化，以更准确地估算多个时间段和多个Landsat平台上的灌溉面积。归一化可以更准确地评估跨越数十年的植被指数数据。使用2008年生长季节田间收集的农作物数据对方法和本研究结果进行准确性评估。与实地数据的比较表明，基于遥感的历史灌溉面积估计值的准确性非常好，误报率（确定为非真正灌溉的面积）仅为4％，假阴性（确定为未灌溉的区域，是真正被灌溉的区域）的范围为0.6-2.0％。

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