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    基于双注意力网络的火迹地制图方法

    A burned area mapping method based on an improved dual attention network

    • 摘要: 火灾对全球生态环境和气候变化具有深远影响,准确获取火迹地信息对于火灾管理、碳排放评估及生态恢复至关重要。传统火迹地提取方法(如MCD64产品)在精度和时空分辨率方面仍存在局限性。该研究提出了一种基于深度学习的改进双注意力网络(modified dual attention network, mDANet),并利用MODIS影像进行火迹地分割。模型在燃烧严重程度趋势监测(monitoring trends in burn severity, MTBS)数据集上进行训练和验证,并采用基于短波红外2和3波段的植被指数、归一化燃烧率和燃烧指数为双时相差分特征作为输入,以提升火迹地边界的检测精度。实验结果表明,相较于MCD64产品,mDANet在精确度、召回率和交并比指标上均取得显著提升。其中,召回率从0.75提高至0.89,平均交并比从0.50提高至0.72,证明了该方法在火迹地提取任务中的有效性。通过可视化分析进一步验证,mDANet生成的火迹地边界更加连续,避免了MCD64由于漏检导致的不完整问题。然而,研究也发现,小尺度火迹地的检测仍然面临一定挑战,较高的下采样倍数可能导致部分高频信息丢失。所提方法为高精度火迹地遥感监测提供一种可行的解决方案。

       

      Abstract: Wildfires have profound impacts on global ecosystems and climate change. Accurately acquiring the information on burned areas is crucial for fire management, carbon emission assessment, and ecological restoration. Traditional burned area extraction methods, such as the MCD64 product, still face limitations in accuracy and spatiotemporal resolution and thus struggle to meet the requirements for high-accuracy monitoring. Hence, this study proposed an improved dual attention network (mDANet) model based on deep learning for burned area segmentation from MODIS images. The mDANet model was trained and validated on the MTBS dataset. Three bi-temporal difference indices (i.e., VI57, NBR2, and MIRBI) were used as input features to enhance the accuracy in detecting burned area boundaries. The experimental results demonstrate that compared to the MCD64 product, the mDANet model exhibited significant improvements in multiple evaluation metrics, including accuracy, recall, and intersection over union (IoU). Specifically, the mDANet model improved the recall value from 0.75 to 0.89 and the mean IoU from 0.50 to 0.72, verifying its effectiveness in burned area extraction. Further visual analysis confirms that the mDANet model produced more continuous burned area boundaries, eliminating the omission errors observed in the MCD64 approach. However, challenges remain in detecting small-scale burned areas, as higher downsampling rates may lead to the loss of some high-frequency spatial information. Overall, the proposed method provides a viable solution for high-accuracy remote sensing monitoring of burned areas.

       

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