Fig. 1. The DEM of Liangshan plateau mountain in Sichuan province, China

Fig. 2. The process of systematic mountain structure extraction based on DEM

Fig. 3. The coding principle of ridge line

Fig. 4. The peaks distribution of Liangshan plateau mountain and detailed local peaks

Fig. 5. The distribution of ridge lines of Liangshan plateau mountain

Fig. 6. Mountain peaks distribution in Liangshan plateau mountain

Fig. 7. Mountain ridges distribution in Liangshan plateau mountain

Fig. 8. the relationship between fuzzy membership and number of peaks in Liangshan

Fig. 9. The comparison between the main peaks extracted by fuzzy membership and algorithm in Liangshan

Fig. 10. The main ridge lines extracted by fuzzy membership in Liangshan