基于Lansat7 ETM+影像的城市道路信息提取研究  

A Research for City Road Extraction from Satellite Image ETM+

作　　者：贾玲[1] 赵云升[1] 张建辉[2] 董贵华[2] 

机构地区：[1]东北师范大学城市与环境科学学院,吉林长春130024 [2]中国环境监测总站,北京100029

出　　处：《遥感技术与应用》2005年第5期478-482,共5页Remote Sensing Technology and Application

基　　金：国家科技部科技攻关项目(基于遥感的宏观生态监控技术研究)(2003BA614A-06-04)

摘　　要：道路信息是遥感卫星影像中一种重要的地理专题信息,道路信息的提取在卫星数字图像自动解译方面具有理论与方法意义,如果能自动地从遥感卫星影像中提取出道路网,将会简化城市地物目标的分类和测量过程。研究结合了计算机和人在自动检测和识别上的优势,以ETM+为数据源,提出了遥感卫星影像中道路特征半自动提取的一种方法。研究首先对ETM+的多光谱影像和15 m分辨率的全色影像进行融合,然后通过设计一个高通滤波器和统计滤波器,完成道路信息的检测与识别(其中高通滤波突出地物的线性特征、统计滤波则是消除高通滤波后的一些噪音),最后进行矢量化跟踪完成道路信息的提取。实践结果表明,该方法能够从中等分辨率遥感卫星影像中提取道路信息,取得了较好的精度效果。As a kind of base geographical information, road extraction from satellite images is important in practice a theory of automatic satellite images recognition. The classification and measuring for geometrical objects of a city will be simplified if its main road network could be automatically extracted from satellite images. This paper is based on combine the superiority of computer and man on detect and identify, present a semiautomatic extraction method of road on satellite image. In this approach, we discussed a method based on image texture characters through designing filter cluster for detection and recognition. The filter cluster includes two filters, one is the high pass filter through which the borderline characteristics of the object in imagery can be detected, another is the statistical filter through which some noise made by high pass filter can be abated. In process of high pass filtering, how to select the size of filtering Window is very important to precision. We had designed a proportion factor to depict processing result. The test result indicated that the 7 ＊ 7 filter window was the most appropriate in this research. A comparison of differences was finished between the result by traditional method and by multi-filter. The vector layer gained though multi-filtering has fewer noises than those only through single filtering. The result of test indicated that multi-filter method could improve the precision of analysis, Experimental results on ETM＋, and the result of the text indicatec that this method could possibility of extracting semiautomatic the road information layers from middle satellite imagery, and provided technology basis for application of middle-resolution satellite imagery.

关 键 词：ETM+影像 融合 滤波 道路提取 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]