Abstract: The addition,loss,and other changes of physical graphic elements in terrain level basic geographic data make it difficult to associate them with graphic elements when updating in the database,which can not guarantee the dynamic updating of geographic information,and the spatial location accuracy of complex scenes is insufficient.To this end,a collaborative dynamic update method for terrain level basic geographic entities and elements is proposed.Connect the basic geographic information feature data and terrain level basic geographic entity data through the correspondence between features and graphic elements.Build a collaborative update library,design hanging fields for basic geographic information feature data,conduct entity entity association modeling,and adopt a collaborative dynamic update method for entity entities based on DOM orthophoto comparison analysis.Using collaborative database generation for updating operations,exporting basic geographic features and entities.Through steps such as spatial benchmark conversion,resolution unification,and entity change detection,achieve collaborative dynamic updates for the creation,expansion,and loss of entity entities.The experimental results show that the collaborative update library constructed by this method has detailed classification,efficient collaborative updates,can effectively maintain the relationship between entities and graphic elements,accurately capture changes in geographical features,and the spatial position deviation of the same named land features is within 0.3 m.Therefore,this method can effectively ensure the accuracy and consistency of updates.

Key words: terrain level, basic geographic entity, collaborative dynamic updates, collaborative update library, DOM orthophoto, spatial consistency