雷达遥感图像的处理，由于受单机内存空间的限制，一般采用I／O函数随机访问磁盘图像文件的方式，因此完成整幅图像的处理需要耗费大量的时间，很难达到实际应用的需要。基于分布式共享内存网络系统JIAJIA软件将多台微机的物理内存连接...雷达遥感图像的处理，由于受单机内存空间的限制，一般采用I／O函数随机访问磁盘图像文件的方式，因此完成整幅图像的处理需要耗费大量的时间，很难达到实际应用的需要。基于分布式共享内存网络系统JIAJIA软件将多台微机的物理内存连接构成一个较大的共享内存空间，实现了多台微机对遥感图像同步、方便、快捷的处理。通过对SAR图像几何纠正、图像滤波、监督分类串行算法的分析，发展了相应的并行处理算法，并在8台运行Linux操作系统，主频400MHz，内存256兆的Pentium II PC机上进行了实验，都获得了超线性加速比的实验结果。展开更多
The Arun and Tista Rivers,which flow across the Himalayas,are commonly known as antecedent valleys that overcame the rapid uplift of the Higher Himalayan ranges.To clarify whether the idea of antecedent rivers is acce...The Arun and Tista Rivers,which flow across the Himalayas,are commonly known as antecedent valleys that overcame the rapid uplift of the Higher Himalayan ranges.To clarify whether the idea of antecedent rivers is acceptable,we investigated the geomorphology of the Himalayas between eastern Nepal and Bhutan Himalayas.The southern part of Tibetan Plateau,extending across the Himalayas as tectonically un-deformed glaciated terrain named as'Tibetan Corridor,'does not suggest the regional uplift of the Higher Himalayas.The 8,000-m class mountains of Everest,Makalu,and Kanchenjunga are isolated residual peaks on the glaciated terrain composed of mountain peaks of 4,000–6,000 m high.The Tibetan glaciers commonly beheaded by Himalayan glaciers along the great watershed of the Himalayas suggest the expansion of Himalayan river drainage by glaciation.For the narrow upstream regions of the Arun and Tista Rivers with less precipitation behind the range,it is hard to collect enough water for the power of down-cutting their channels against the uplifting Himalayas.The fission track ages of the Higher Himalayan Crystalline Nappe suggest that the Himalayas attained their present altitude by 11–10 Ma,and the Arun and Tista Rivers formed deep gorges across the Himalayas by headward erosion.展开更多
文摘雷达遥感图像的处理，由于受单机内存空间的限制，一般采用I／O函数随机访问磁盘图像文件的方式，因此完成整幅图像的处理需要耗费大量的时间，很难达到实际应用的需要。基于分布式共享内存网络系统JIAJIA软件将多台微机的物理内存连接构成一个较大的共享内存空间，实现了多台微机对遥感图像同步、方便、快捷的处理。通过对SAR图像几何纠正、图像滤波、监督分类串行算法的分析，发展了相应的并行处理算法，并在8台运行Linux操作系统，主频400MHz，内存256兆的Pentium II PC机上进行了实验，都获得了超线性加速比的实验结果。
基金This work was supported by Grants-in-Aid for Scientific Research of the Japanese Society for the Promotion of Science(JSPS KAKENHI)Grant Number 18H00766(principal investigator:Takashi Nakata)Grant Number 18KK0027(principal investigator:Yasuhiro Kumahara).
文摘The Arun and Tista Rivers,which flow across the Himalayas,are commonly known as antecedent valleys that overcame the rapid uplift of the Higher Himalayan ranges.To clarify whether the idea of antecedent rivers is acceptable,we investigated the geomorphology of the Himalayas between eastern Nepal and Bhutan Himalayas.The southern part of Tibetan Plateau,extending across the Himalayas as tectonically un-deformed glaciated terrain named as'Tibetan Corridor,'does not suggest the regional uplift of the Higher Himalayas.The 8,000-m class mountains of Everest,Makalu,and Kanchenjunga are isolated residual peaks on the glaciated terrain composed of mountain peaks of 4,000–6,000 m high.The Tibetan glaciers commonly beheaded by Himalayan glaciers along the great watershed of the Himalayas suggest the expansion of Himalayan river drainage by glaciation.For the narrow upstream regions of the Arun and Tista Rivers with less precipitation behind the range,it is hard to collect enough water for the power of down-cutting their channels against the uplifting Himalayas.The fission track ages of the Higher Himalayan Crystalline Nappe suggest that the Himalayas attained their present altitude by 11–10 Ma,and the Arun and Tista Rivers formed deep gorges across the Himalayas by headward erosion.
