Production method for 1∶10 000 DLG key element updating based on change detection in provincial basic surveying and mapping
By the end of 2022,full provincial coverage of basic surveying and mappingis achieved in Gansu.Starting in 2023,provincial basic surveying and mapping results commence an update cycle.According to the 14th Five-Year Plan for basic surveying and mapping in Gansu Province,the core elements of 1∶10 000 fundamental geographic information data(digital topographic maps)covering all production and living areas of the province(approximately 220 000 km2)are required to be updated twice.The area is large and the task is arduous.In response to meeting the annual update requirements for 1∶10 000 DLG in provincial basic surveying and mapping,and by leveraging existing multi-year basic surveying and mapping results,a production method for updating key elements in 1∶10 000 DLG based on change detection for provincial basic surveying and mapping is proposed.Building upon a summary of the current construction and application of surveying and mapping geographic information data,this paper analyzes the current status of DLG data in Gansu Province,and in conjunction with the regional characteristics of Gansu,identifies key elements for updating.Update schemes and quality inspection methods are formulated for different elements.Practical production has verified the feasibility of this method,which can reasonably guide the routine updating production of 1∶10 000 basic surveying and mapping.
Change discoveryBasic surveying and mappingKey elementsUpdate production
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