The commercial high-resolution imaging satellite with 1 m spatial resolution IKONOS is an important data source of information for urban planning and geographical information system (GIS) applications. In this paper, ...The commercial high-resolution imaging satellite with 1 m spatial resolution IKONOS is an important data source of information for urban planning and geographical information system (GIS) applications. In this paper, a morphological method is proposed. The proposed method combines the automatic thresholding and morphological operation techniques to extract the road centerline of the urban environment. This method intends to solve urban road centerline problems, vehicle, vegetation, building etc. Based on this morphological method, an object extractor is designed to extract road networks from highly remote sensing images. Some filters are applied in this experiment such as line reconstruction and region filling techniques to connect the disconnected road segments and remove the small redundant. Finally, the thinning algorithm is used to extract the road centerline. Experiments have been conducted on a high-resolution IKONOS and QuickBird images showing the efficiency of the proposed method.展开更多
In Garze Tibeta n Aut ono mous Prefecture, China's Sichuan Province, there is a snowcovered postal route which is about 1,208 kilometers in length and around 3,500 meters above sea level. Along this route, envelop...In Garze Tibeta n Aut ono mous Prefecture, China's Sichuan Province, there is a snowcovered postal route which is about 1,208 kilometers in length and around 3,500 meters above sea level. Along this route, envelopes and parcels from all around the world make their way to every nook and cranny of each household it serves. One Khampa man, Chimed Dorjee, has done the job day in and day out for 30 years, his accrued mileage equivalent to having made 35 laps around the earth's equator.展开更多
文摘The commercial high-resolution imaging satellite with 1 m spatial resolution IKONOS is an important data source of information for urban planning and geographical information system (GIS) applications. In this paper, a morphological method is proposed. The proposed method combines the automatic thresholding and morphological operation techniques to extract the road centerline of the urban environment. This method intends to solve urban road centerline problems, vehicle, vegetation, building etc. Based on this morphological method, an object extractor is designed to extract road networks from highly remote sensing images. Some filters are applied in this experiment such as line reconstruction and region filling techniques to connect the disconnected road segments and remove the small redundant. Finally, the thinning algorithm is used to extract the road centerline. Experiments have been conducted on a high-resolution IKONOS and QuickBird images showing the efficiency of the proposed method.
文摘In Garze Tibeta n Aut ono mous Prefecture, China's Sichuan Province, there is a snowcovered postal route which is about 1,208 kilometers in length and around 3,500 meters above sea level. Along this route, envelopes and parcels from all around the world make their way to every nook and cranny of each household it serves. One Khampa man, Chimed Dorjee, has done the job day in and day out for 30 years, his accrued mileage equivalent to having made 35 laps around the earth's equator.
