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首页> 外文期刊>IEEE Transactions on Geoscience and Remote Sensing >Validation of active fire detection from moderate-resolution satellite sensors: the MODIS example in northern eurasia
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Validation of active fire detection from moderate-resolution satellite sensors: the MODIS example in northern eurasia

机译：验证中分辨率卫星传感器进行的主动火情探测：以欧亚大陆北部的MODIS为例

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This paper discusses the process of validating active fire "yeso" binary fire detection products from moderate-resolution satellite sensors. General concepts and practical issues are illustrated by the validation of the Moderate Resolution Imaging Spectroradiometer (MODIS) active fire product in Siberia. Coincident Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) imagery is used to characterize spatial patterns of flaming at sub-MODIS pixel scale. It is shown that for proper evaluation reference fire observations are needed at the scale of the satellite pixel, as only 60% of the MODIS footprints contain single contiguous clusters of ASTER fire pixels. In Siberia the size of a single ASTER fire cluster within the MODIS footprint that has a 50% probability of being flagged as "fire" is /spl sim/60, compared to /spl sim/45 in the Brazilian Amazon, whereas previous radiative transfer simulations suggested similar detection probabilities. The lower-than-expected detection rates in Siberia are largely attributable to flaming underneath heavy smoke, which is not detected by the current MODIS algorithm. Pixel-based and cluster-based omission error rates are derived, and it is shown that the probability of flagging as "fire" a MODIS pixel which contains a given number of 30-m ASTER fire pixels is typically 3-5 times lower than detecting a contiguous cluster with the same number of ASTER fire pixels. The procedures described are recommended for a consensus active fire validation protocol, but with the inclusion of multiplatform sensor configurations to complement the near-nadir angular sampling from single-platform observations such as MODIS and ASTER on Terra.
机译：本文讨论了从中等分辨率卫星传感器验证主动火灾“是/否”二进制火灾探测产品的过程。通过对西伯利亚中分辨率成像分光辐射计（MODIS）有源火产品的验证，可以说明一般概念和实际问题。巧合先进的星载热发射和反射辐射计（ASTER）图像用于表征亚MODIS像素尺度下的火焰的空间模式。结果表明，为了进行适当的评估，需要在卫星像素范围内观察参考火灾，因为只有60％的MODIS覆盖区包含ASTER火像素的单个连续簇。在西伯利亚，MODIS足迹内单个ASTER火群的大小为/ spl sim / 60，而被标记为“火”的可能性为50％，而巴西亚马逊的是/ spl sim / 45，而先前的辐射转移是模拟表明相似的检测概率。西伯利亚的检出率低于预期主要是由于浓烟下的火焰燃烧所致，当前的MODIS算法无法检测到这种情况。推导了基于像素和基于群集的遗漏错误率，结果表明，将包含给定数量的30 m ASTER点火像素的MODIS像素标记为“点火”的概率通常比检测低3-5倍具有相同数量ASTER火像素的连续群集。建议将这些程序用于共识性主动火力验证协议，但要包括多平台传感器配置，以补充单平台观测数据（例如Terra上的MODIS和ASTER）的近天底角采样。

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