Abstract:

Four towns in Dongguan city in the Pearl River Delta were chosen as a typical urbanization region and as pilot sites for the third national land survey. The overall planning and design involved pilot contents, typical choice, pilot approaches, study route, quality control, etc. Data source category selection was proposed according to the quality of referable base maps for land surveys, and three data combination models were used for comparative experiments. From the perspective of investigative technology, the implementation approach consisted of three key stages: indoor operation for map interpretation or data analysis; field operation for investigation and verification; and final indoor operation for database construction. In this study, pilot exploration and practice utilized special reports, statistical tables, maps, and databases, yielding rich research findings. Taking the land use survey as an example, the differences and spatial pattern characteristics of each pilot area that has experienced rapid urbanization were analyzed. Meanwhile, seven key technical issues were discovered: the use of confidential basic data, proof of inconsistent map spots, processing of tiny map spot, identification standard of land class, spatial mismatch of multi-source data, database structure, and core association of identification code. The advanced and highly efficient implementation measures were studied to provide a series of pilot experiences. The pilot results provide an important basis for meticulous land management during a new period for the four pilot areas. Additionally, prior knowledge and reference samples were provided for the third national land survey in Dongguan or for other highly urbanized areas.

Key words: third national land survey, highly urbanized area, land use, Dongguan