【摘要】 北京1号小卫星在轨运行一年多成功接收了覆盖中国各个行政区域的多光谱影像数据,为全国数字镶嵌图的研究提供了丰富的数据资料。针对北京1号小卫星特点进行关键技术和方法研究,形成了北京1号小卫星多光谱影像全国范围数据获取任务测控优化模式,解决了北京1号小卫星多光谱数据预处理中去条带、波段自动配准、MTF复原处理等关键技术,系统地、全面地阐述了全国镶嵌图制作的技术流程和方法。更多还原

【Abstract】 Beijing-1 small satellite was launched in October 2005.It includes two sensors,32m three bands multispectral(green,red and near-infrared)and 4m panchromatic.Its revisiting period is very short,which was planned about 3—5 days depending on latitude at 32m resolution.Another important advantage of this satellite is the large area collection capability of 32m multispectral image,600km width imaging swath and more than 4000km stripe.These allow us to efficiently collect a large amount of imagery data,covering every region of the world.Due to the advantages of 32m multispectral image,it is obviously suitable for mapping,especially for large area,such as the whole country of China.So Beijing-1 small satellite will challenge the predominant role of satellite image data,such as TM and SPOT in Chinese large-area mapping work.Beijing-1 small satellite ground station is the first one in China that integrates satellite supervising and controlling,task planning,data acquisition,data preprocessing and mosaic,etc.Because of the incorporate working mode,the image data of Beijing-1 small satellite was obtained and processed.By the date of Nov.20th 2006,the obtained image data has more than 1000 orbits,which covers the whole country of China,and about 20 times for some area.Based on the abundant image data,the study of China’s digital mosaic map of Beijing-1 small satellite was promoted.This paper introduces the methods of image enhancement,geometric correction,image mosaic,and color adjustment,which led to a successful China’s digital mosaic map based on multispectral images of Beijing-1 small satellite.As to image preprocessing,destriping,band registration and MTF restoration was applied.Moreover,in order to improve the quality and efficiency,data preprocessing and geometric correction was done on every orbit.During the color adjustment,the image data was divided into many rectangle cells with the same area,with overlapping area between any joined cells.In practice,the data cell was 17125 pixel 17700 pixel,about 870MB,with 1000 pixel overlapping between any joined cells.There are 53 cells covering the land of China.Due to same small cells,it was obviously to decrease the cost of hardware for data processing,to improve the effect of color adjustment.According to the above mentioned approach,it will take less than half a year to obtain the Beijing-1 small satellite image data covering the whole country of China,and then only two months are needed to finish the whole mosaic work.As the result of study,by Dec.2006,two pieces of digital mosaic image of China has been achieved.The digital mosaic map is being and will be used in many fields,such as forest monitoring,land use and land cover change study,resource research,digital mapping and so on.Moreover,the experience to achieve the 32m mosaic image map is useful for other similar projects.更多还原