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Examining the potential of using remotely sensed fire data to predict areas of rapid forest change in South America

机译：研究使用遥感火灾数据预测南美快速森林变化地区的潜力

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Major advances have been made in the last decades estimating deforestation by using satellite data. This has been mostly done by detecting differences in a time series of high resolution data. However, the interpretation of the images and the detection of change is cumbersome and expensive. Furthermore, the area covered by a high resolution image is relatively small and only available on a monthly bases. This work investigates if detected fire of the low resolution (AVHRR) sensor can be used as a quick and inexpensive way of locating areas of rapid forest cover change. It tests the hypothesis that vegetation fires, as detected by earth orbiting satellites, arc a reliable indicator of "hot spots" of deforestation in tropical South America. Fine spatial resolution satellite data were used to measure the deforestation that occurred in the mid 1990s in 41 sites spread across the tropical forests of South America. These data were then compared to the number of fires occurring in these sites, as detected by the NOAA-AVHRR satellite between April 1992 and December 1993. At the individual site level, 25 of the test sites showed a significant statistical relationship between the fires and the deforestation occurring in the following years. A further 6 sites showed neither fire activity nor significant deforestation. When aggregated to the regional level, only the set of sites lying in relatively dry areas with the same land use practices (located in Brazil) showed a significant correlation between fireand deforestation. This correlation enabled us to produce a map of high deforestation risk occurring in 1992 in the Brazilian Amazon, which showed close correspondence to the actual deforestation fronts of the year 1992.
机译：在过去的几十年中，通过使用卫星数据估计森林砍伐已取得了重大进展。这主要是通过检测高分辨率数据的时间序列中的差异来完成的。然而，图像的解释和变化的检测是麻烦且昂贵的。此外，高分辨率图像所覆盖的区域相对较小，并且仅按月提供。这项工作调查了是否可以将低分辨率（AVHRR）传感器的探测到的火灾用作定位森林覆盖快速变化区域的快速而廉价的方法。它检验了这样一种假说，即地球绕行卫星检测到的植被火灾是南美洲热带地区森林砍伐“热点”的可靠指标。精细的空间分辨率卫星数据用于测量1990年代中期发生在南美洲热带森林中41个地点的森林砍伐。然后将这些数据与这些地点发生的火灾次数进行比较，如1992年4月至1993年12月之间由NOAA-AVHRR卫星所检测到的。在单个地点级别，有25个测试地点显示了火灾与火灾之间的显着统计关系。在随后的几年中发生了森林砍伐。另有6个地点既没有发生火灾，也没有发生严重的森林砍伐。当汇总到区域级别时，只有位于相对干燥地区且具有相同土地使用实践的一组地点（位于巴西）显示火灾与森林砍伐之间存在显着相关性。这种相关性使我们能够绘制出一张1992年在巴西亚马逊地区发生的高森林砍伐风险地图，该地图与1992年的实际森林砍伐前沿息息相关。

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