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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Burned-Area Mapping of the Serengeti–Mara Region Using MODIS Reflectance Data
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Burned-Area Mapping of the Serengeti–Mara Region Using MODIS Reflectance Data

机译:使用MODIS反射率数据对塞伦盖蒂-马拉地区进行烧毁面积测绘

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Fire is a key factor for vegetation structure and ecosystem functioning in the Serengeti–Mara region in East Africa. However, there is a lack of accurate and consistent information on fires. We developed an algorithm for mapping burned areas in the wider Serengeti–Mara region from remote-sensing data. The algorithm is automated and, once trained for one year, runs independently for all years. It uses daily measurements of red and near-infrared (NIR) reflectance acquired by the Moderate Resolution Imaging Spectroradiometer (MODIS) sensor at a spatial resolution of 250 m. The MODIS time series was first converted to ten-day minimum NIR composites. Each composite was then classified into new and old burned areas, by thresholding burned-area index and temporal difference of NIR reflectances. The algorithm adjusts detection thresholds dynamically using measures related to atmospheric and vegetation conditions. Having trained the algorithm once on 2003 data, it was applied to MODIS data from April 21, 2000 to November 10, 2005. Accuracy was improved by size- and location-sensitive filters. Overall accuracy was 90.3% as determined from Advanced Spaceborne Thermal Emission and Reflection Radiometer satellite imagery from 2005 and 87.1% as determined using field data from 2005. The algorithm holds the potential to be applied to other savanna areas. This letter provides a reliable product useful for future investigations of fire ecology and fire management.
机译:火灾是东非塞伦盖蒂-马拉地区植被结构和生态系统功能的关键因素。但是,缺少有关火灾的准确和一致的信息。我们开发了一种算法,可根据遥感数据绘制更广泛的塞伦盖蒂-马拉地区的燃烧区域。该算法是自动的,并且经过一年的培训,可以独立运行整年。它使用中分辨率成像光谱仪(MODIS)传感器以250 m的空间分辨率对红色和近红外(NIR)反射率进行每日测量。 MODIS时间序列首先转换为10天的最小NIR复合。然后,通过对燃烧面积指数和近红外反射率的时间差进行阈值化,将每种复合材料分为新的和旧的燃烧区域。该算法使用与大气和植被状况有关的措施动态调整检测阈值。在2003年的数据上对算法进行了一次训练之后,从2000年4月21日到2005年11月10日,该算法已应用于MODIS数据。尺寸和位置敏感的过滤器提高了准确性。根据2005年的先进星载热发射和反射辐射计卫星图像确定的整体准确度为90.3%,使用2005年的实地数据确定的整体准确度为87.1%。该算法具有将其应用于其他热带稀树草原的潜力。这封信提供了一种可靠的产品,可用于将来对火灾生态和火灾管理的研究。

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