The updating of small and medium scale vector terrain database in china has been carried out regularly for many years. But in difficult areas such as depopulated zone, the surveying and mapping work is limited to the impact of many objective factors such as traffic, climate and environment. In particular, the research on the production technology of geomorphic data relying on photogrammetric technology is of great significance. In order to improve the efficiency and applicability of basic surveying and mapping, the technology of geomorphic elements production based on existing geographic information data was discussed and studied, and the manufacturing flow was designed. For different data source conditions, several test areas were selected for production, accuracy verification and results analysis. Forming a complete production solution which can provide implementation suggestions for geomorphic data production under similar conditions.
Realistic 3D China construction represents the transformation and upgrading of traditional basic surveying and mapping services. Its city and topography-level 3D models require two basic digital products, namely digital elevation model and digital orthophoto map, to be expressed as the digital base. The quality of digital products directly determines the reliability and exquisite expression of 3D models. Currently, no complete quality inspection software for the basic digital products of the Realistic 3D China Construction Project is available. Many key technologies of its quality inspection were studied in this paper and a quality inspection system was developed. In the system research and development, some original implementation methods for the inspection of some important quality sub-elements were created. And it has been proved that the quality inspection efficiency was improved and the false positive probability was reduced compared with the traditional inspection methods. The full practice and application of the system in several production organizations prove that it can better satisfy the requirements for the high quality of this project.
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