Abstract: The establishment of a natural resource survey and monitoring system requires a unified 3D spatial positioning framework and data analysis foundation. This paper takes into account the topographic features, regional economic pattern, and high-quality land and space system goals of Inner Mongolia Autonomous Region, and studies the overall layout and construction method of building a high-precision 3D real scene natural resource survey and monitoring data base by layering, grading, and different precisions, focusing on the technical route, technical indicators and practical results of the 3D real scene construction of the terrain level and city level. The accuracy of the relevant practical results is better than the designed technical indicators. The results have effectively served Inner Mongolia's natural resource management, urban land space monitoring, 3D spatio-temporal database construction and other purposes, and promoted the construction process of 3D real scene Inner Mongolia.

Key words: natural resource survey and monitoring, 3D real scene, grading, precision, construction method