基于ADS80数码影像进行DEM数据更新的研究与应用

摘要

以武汉市江夏区DEM数据更新为例，探讨利用ADS80三线阵数码航空影像进行DEM更新的优势。结合MapMatrix系统强大的综合数据生产能力，引入外部特征点线数据，设计了一套切实可行的DEM数据更新具体生产流程，DEM生产效率得到大幅提升。利用航摄像控点库和外业RTK采集高程检核点进行验证，成果精度优于5m格网城市基础地理信息系统规范要求。%Taking the DEM Updating project in Jiangxia district of Wuhan as an example, the advantages of DEM Updating with ADS80 three - line digital aerial image have been discussed. With the application and development of MapMatrix, especially its powerful function in data production, and the introduction of external point - line feature data, a set of practical DEM updating procedure has been designed. DEM productivity has been risen greatly. Making use of aerial photo control points and the height checkpoints acquired by field RTK survey, the precision of results is superior to urban geographical information system specifications based on 5m- grid DEM.