Abstract: Ecological protection red line calibration is an important measure to ensure the accurate implementation of ecological protection red lines, and an important means to practice the important concept of "lucid waters and lush mountains are invaluable assets". This paper proposes a multi-factor ecological protection red line demarcation standard. The automatic pre-labeling method, by establishing the minimum computing unit at the boundary of the ecological protection red line and defining its area attributes, then evaluates and calculates its topographical features, road accessibility, and the frequency of human activities, and finally obtains a large-scale scene and a large-scale ecological protection red line pre-marked areas for boundary stakes and signage points. Taking Chongqing's ecological protection red line as the test area, it is verified that this method can achieve good results, improve the scientificity and rationality of boundary piles, signage points and layout density, reduce production costs, and have the characteristics of high efficiency and high degree of automation.

Key words: multi-factor, survey and demarcation, topography and landform, road accessibility, man-made activities