Abstract: The demarcation and calibration of ecological protection red line is faced with problems such as irregular boundary, fragmentation and long extension. With the real, three-dimensional and sequential characteristics of 3D real scene, it will be effective to assist the boundary verification and pre-labeling key points. This paper takes the scale characteristics of 3D real scene as the research perspective, analyzing data acquisition accuracy, content and coverage. Considering the scale of base map that required by ecological protection red line demarcation and calibration, we analyzed its relationship to the scale characteristics of 3D real scene, and puts forward the application idea of integrated multi-scale 3D real scene model. Finally, taking the demarcation and calibration of the ecological protection red line of Zhaomushan Forest Park in Chongqing as an example, the application of multi-source and multi-scale 3D real scene data in different links is analyzed. We find it effectively improves the scientific and efficiency of our work and will be the foundation for ecological protection red line monitoring and supervision.

Key words: 3D real scene, ecological protection red line, demarcation and calibration, scale