Validation of active fire detection from moderate-resolution satellite sensors: The MODIS example in northern Eurasia
Validation of active fire detection from moderate-resolution satellite sensors: The MODIS example in northern Eurasia
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DOI：
10.1109/tgrs.2006.875941
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发表时间：
2006-07-01
影响因子：
8.2
通讯作者：
Giglio, Louis
中科院分区：
文献类型：
--
作者：
Csiszar, Ivan A.;Morisette, Jeffrey T.;Giglio, Louis
本文讨论了中分辨率卫星传感器对有源火灾“是/否”二元火灾探测产品的验证过程。通过对西伯利亚中分辨率成像光谱仪（MODIS）活火产品的验证，说明了一般概念和实际问题。采用先进星载热发射和反射辐射计（ASTER）同步图像，在亚modis像素尺度上对燃烧的空间模式进行表征。研究表明，只有60%的MODIS足迹包含单个连续的ASTER火灾像元簇，因此需要在卫星像元尺度上进行参考火灾观测。在西伯利亚，MODIS足迹内单个ASTER火团的大小（有50%的概率被标记为“火灾”）类似于60，而在巴西亚马逊地区类似于45，而之前的辐射传输模拟显示了类似的探测概率。西伯利亚的探测率低于预期，主要是由于浓烟下的燃烧，而目前的MODIS算法无法探测到这一点。基于像素和基于聚类的遗漏错误率分别进行了推导，结果表明，与检测具有相同数量的ASTER火灾像素的连续簇相比，含有给定数量的30 m ASTER火灾像素的MODIS像素标记为“火灾”的概率通常低3-5倍。所描述的程序被推荐用于达成共识的主动火灾验证协议，但包含多平台传感器配置，以补充来自单一平台观测（如Terra上的MODIS和ASTER）的近最低点角度采样。
This paper discusses the process of validating active fire "yes/no" 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 similar to 60, compared to similar to 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.