Abstract: Presently, new fundamental surveying and mapping are carrying out around the country. Among them, one of the most significant process is producing geo-entities from existing topographic map. This paper introduces the principle and process of transforming topographic maps into geo-entities, and proposes a method to automatically produce geo-entities from existing DWG data and topographic map database. We are carrying out data production experiments on iData software to verify the feasibility of this process. This paper summarizes the requirements of processing methods and statistics the automation efficiency of the whole process. Futhermore, we analyze the factors which may affect the efficiency of automation and operating few methods to improve the efficiency of automation. This paper has certain reference significance for producing geo-entities from the existing topographic maps.

Key words: new fundamental surveying and mapping, geo-entity, topographic map, data conversion, iData