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首页> 外文期刊>IEEE Geoscience and Remote Sensing Letters >Backscatter change on fire scars in Siberian boreal forests in ENVISAT ASAR wide-swath images
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Backscatter change on fire scars in Siberian boreal forests in ENVISAT ASAR wide-swath images

机译：ENVISAT ASAR宽幅影像中西伯利亚北方森林火灾疤痕的反向散射变化

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摘要

The objective of this letter was to investigate the performance of the C-band Advanced Synthetic Aperture Radar (ASAR) instrument onboard the European ENVISAT satellite for mapping fire scars in boreal forest ecosystems. The Wide Swath Mode (WSM) of the cloud and haze-penetrating ASAR instrument with a spatial resolution of 150 m would be ideal to support nearly real-time fire monitoring and impact assessment over the vast and sparsely populated circumpolar forest belt. We found that: (1) the ASAR WSM backscatter signal was sensitive to fire disturbance; (2) the backscatter change correlated mainly with snow-melt and rainfall; and (3) the backscatter varied as a function of the incidence angle with a higher backscatter occurring at shallower incidence angles. The results suggest ASAR WSM data could be used to support operational fire impact monitoring in boreal forests of Siberia. Multitemporal datasets are required because environmental conditions strongly influence the backscatter signal.
机译：这封信的目的是研究欧洲ENVISAT卫星上的C波段高级合成孔径雷达（ASAR）仪器的性能，该仪器用于绘制北方森林生态系统中的火疤。云和穿透雾霾的ASAR仪器的宽幅模式（WSM）具有150 m的空间分辨率，非常适合在广阔且人烟稀少的圆极林带上支持近乎实时的火灾监测和影响评估。我们发现：（1）ASAR WSM后向散射信号对火场干扰敏感； （2）后向散射变化主要与融雪和降雨有关； （3）反向散射随入射角而变化，较高的反向散射在较浅的入射角处发生。结果表明，ASAR WSM数据可用于支持西伯利亚北方森林的业务火灾影响监测。需要多时态数据集，因为环境条件会严重影响反向散射信号。

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