Fig. 1. Map showing the topography of the Qinghai-Tibet Plateau with ASTER GDEM

Fig. 2. Spatial patterns of the relief degree of land surface (RDLS) with different window areas in the Qinghai-Tibet Plateau, China

Fig. 3. Scatter diagram of the mean elevation range and S-S_k with different window areas

Fig. 4. The proportion curves of corresponding land area of different-level relief degree of land surface (RDLS) in the Qinghai-Tibet Plateau, China

Fig. 5. Spatial distribution of the relief degree of land surface (RDLS) derived from the optimal analysis window method in the Qinghai-Tibet Plateau, China

Fig. 6. The latitudinal and longitudinal distribution features of the relief degree of land surface (RDLS) in the Qinghai-Tibet Plateau, China

Fig. 7. Correlation analysis between relief degree of land surface (RDLS) and average elevation as well as relative elevation difference in the Qinghai-Tibet Plateau

Fig. 8. The relationship between terrain section and relief degree of land surface (RDLS) in the Qinghai-Tibet Plateau