基于高分三号卫星影像的水体信息提取技术研究

Research on Water Area Information Extraction TechnologyBased on Gaofen-3 Satellite Images

随着各类卫星遥感和航天航空技术的不断进步,采用卫星遥感图像来提取水域的信息成为了新的选择和研究的热点。同时SAR(合成孔径雷达)技术以其不受各类气候、气象的干扰,高分辨率、穿透力强的优点,成为水域信息提取的重要手段。高分三号卫星是近年来我国发射的SAR卫星,为此本文研究所采用的数据源为高分三号HH、VV、HV、VH四种极化方式的SAR图像,研究区域为长春市农安县太平池水库及共青团水库,采用经验阈值分割法分别提取其水域信息,进而分析评价水域提取的正确性和精度。总结发现:1)使用经验阈值分割法可以从SAR图像上提取水体;2)提取的水体经过和天地图和谷歌地图的比对,验证了正确性;3)不同极化方式所提取出来的水体的效果是不同的。

With the development of all kinds of satellite remote sensing and aerospace technology,it has become a new choice and research hotspot to extract water area information from satellite remote sensing images.At the same time,SAR(synthetic aperture radar)technology has become an important means of water area information extraction due to its advantages of high resolution and strong penetration,which is not interfered by all kinds of climate and weather.Gaofen-3 satellite is a SAR satellite launched by China in recent years.Therefore,the data sources used in this study are HH,VV,HV and VH polarimetric SAR images of gaofen-3.The study area is Taipingchi reservoir and Gongqingtuan reservoir in Nong’an county of Changchun.The empirical threshold segmentation method is used to extract the water area information,and then the correctness and accuracy of water area extraction are analyzed and evaluated.The conclusions are as follows:1.The empirical threshold segmentation method can extract water from SAR images;2.The extracted water body is verified by comparing with Tianditu map and Google map.3.The effect of water extracted by different polarization methods is different.