Ophiolites, which have been tectonically emplaced along continental margins and island arcs, are significant to the understanding of mountain belt evolution. In the Himalayas, the ophiolitic suite of rocks occur along...Ophiolites, which have been tectonically emplaced along continental margins and island arcs, are significant to the understanding of mountain belt evolution. In the Himalayas, the ophiolitic suite of rocks occur along the Indussuture zone from Hanle in the southeast to Dras\|Kargil sector in the northwest and it represents the remnant of the compressed uplifted wedge of the oceanic crust between the two colliding continental masses, the Indian and the Asian plates.. These ophiolites are temporally and spatially correlated with the culminating phase of the Himalayan orogeny. The Indus River flows to its north separating the ophiolite from the Trans Himalayan litho\|units. Geological mapping in the hostile and inaccessible mountainous terrains of the Himalaya has always posed a great challenge to geologists. Nevertheless, a number of geologists have undertaken such arduous mapping expeditions in the past and prepared fairly good geological maps of these terrains .However there always existed disputes on the accuracy of lithological boundaries and structural details in these maps because many of these boundaries and structural features were completed through extrapolations and/or interpolations as the ruggedness and inaccessibility of a large part of the terrain forbid physical examination of every outcrop. It is in this context the potential of remote sensing, especially of satellite images, is to be appreciated.展开更多
基于2002-2020年的Jason系列卫星数据,利用一种高风速计算方法得到431次飓风的风速信息。在此基础上,利用基于再分析的美国飓风中心(The National Hurricane Center, NHC)大西洋和东北太平洋飓风最佳路径数据集进行比对分析,对高风速计...基于2002-2020年的Jason系列卫星数据,利用一种高风速计算方法得到431次飓风的风速信息。在此基础上,利用基于再分析的美国飓风中心(The National Hurricane Center, NHC)大西洋和东北太平洋飓风最佳路径数据集进行比对分析,对高风速计算方法进行了综合评估。文中计算和评估结果显示,8.03~66.93 m/s飓风风速RMSE优于4 m/s;卫星观测风速和NHC飓风最佳路径数据相关系数在0.9以上。这表明文中方法是可靠的,具备热带气旋高风速观测能力。同时,文中结果显示,飓风观测期间几乎都伴随着不同程度的降雨,当风速大于50 m/s时,卫星观测点均处于中到暴雨的环境下。文中研究证明了利用卫星雷达高度计和校正辐射计这对主被动微波遥感器联合获取极端海洋环境下风速信息的可行性,这为提升台风或飓风风速观测能力提供了一种有潜力的技术手段。另外,统计结果显示飓风期间风速和气压也具备很好的线性相关性,利用这种关系可以基于卫星获取的高风速信息来快速计算得到热带气旋中心气压,这将形成卫星对热带气旋风速和中心气压的同步获取能力。展开更多
针对地震后利用遥感图像检测受损建筑物,本研究提出了一种基于改进YOLOv3模型的受损建筑物识别方法。首先,通过深入分析尺度特征,对主干网络进行了针对性优化,增强了模型对微小目标特征的捕获能力。其次,引入感受野模块(Receptive Field...针对地震后利用遥感图像检测受损建筑物,本研究提出了一种基于改进YOLOv3模型的受损建筑物识别方法。首先,通过深入分析尺度特征,对主干网络进行了针对性优化,增强了模型对微小目标特征的捕获能力。其次,引入感受野模块(Receptive Field Block,RFB),拓宽了特征图的感知域,提高了对小尺寸目标的检测灵敏度。最后,对锚框及其分配策略进行了精细调整。实验结果表明,相较于原始YOLOv3模型,所提方法检测精度和检测速度均大幅提升,并且在抗噪能力上展现出显著优势;与已有识别方法相比,平均检测精度分别提升了4.8%和5.4%;在处理复杂的目标检测任务时展现出更优的性能和更强的鲁棒性,有效实现了高分辨率遥感图像中受损建筑物的准确识别。展开更多
文摘Ophiolites, which have been tectonically emplaced along continental margins and island arcs, are significant to the understanding of mountain belt evolution. In the Himalayas, the ophiolitic suite of rocks occur along the Indussuture zone from Hanle in the southeast to Dras\|Kargil sector in the northwest and it represents the remnant of the compressed uplifted wedge of the oceanic crust between the two colliding continental masses, the Indian and the Asian plates.. These ophiolites are temporally and spatially correlated with the culminating phase of the Himalayan orogeny. The Indus River flows to its north separating the ophiolite from the Trans Himalayan litho\|units. Geological mapping in the hostile and inaccessible mountainous terrains of the Himalaya has always posed a great challenge to geologists. Nevertheless, a number of geologists have undertaken such arduous mapping expeditions in the past and prepared fairly good geological maps of these terrains .However there always existed disputes on the accuracy of lithological boundaries and structural details in these maps because many of these boundaries and structural features were completed through extrapolations and/or interpolations as the ruggedness and inaccessibility of a large part of the terrain forbid physical examination of every outcrop. It is in this context the potential of remote sensing, especially of satellite images, is to be appreciated.
文摘基于2002-2020年的Jason系列卫星数据,利用一种高风速计算方法得到431次飓风的风速信息。在此基础上,利用基于再分析的美国飓风中心(The National Hurricane Center, NHC)大西洋和东北太平洋飓风最佳路径数据集进行比对分析,对高风速计算方法进行了综合评估。文中计算和评估结果显示,8.03~66.93 m/s飓风风速RMSE优于4 m/s;卫星观测风速和NHC飓风最佳路径数据相关系数在0.9以上。这表明文中方法是可靠的,具备热带气旋高风速观测能力。同时,文中结果显示,飓风观测期间几乎都伴随着不同程度的降雨,当风速大于50 m/s时,卫星观测点均处于中到暴雨的环境下。文中研究证明了利用卫星雷达高度计和校正辐射计这对主被动微波遥感器联合获取极端海洋环境下风速信息的可行性,这为提升台风或飓风风速观测能力提供了一种有潜力的技术手段。另外,统计结果显示飓风期间风速和气压也具备很好的线性相关性,利用这种关系可以基于卫星获取的高风速信息来快速计算得到热带气旋中心气压,这将形成卫星对热带气旋风速和中心气压的同步获取能力。
文摘针对地震后利用遥感图像检测受损建筑物,本研究提出了一种基于改进YOLOv3模型的受损建筑物识别方法。首先,通过深入分析尺度特征,对主干网络进行了针对性优化,增强了模型对微小目标特征的捕获能力。其次,引入感受野模块(Receptive Field Block,RFB),拓宽了特征图的感知域,提高了对小尺寸目标的检测灵敏度。最后,对锚框及其分配策略进行了精细调整。实验结果表明,相较于原始YOLOv3模型,所提方法检测精度和检测速度均大幅提升,并且在抗噪能力上展现出显著优势;与已有识别方法相比,平均检测精度分别提升了4.8%和5.4%;在处理复杂的目标检测任务时展现出更优的性能和更强的鲁棒性,有效实现了高分辨率遥感图像中受损建筑物的准确识别。
