References:
     [1] Ognjanović, Z., Marinković, B., Šegan-Radonjić, M., et al. Cultural heritage digitization in Serbia: Standards, policies, and case studies [J]. Sustainability, 2019, 11(14): 3788.
     [2] Wu, B. H., Wang, M. T. Heritage revitalization, original site value, and presentation methods [J]. Tourism Tribune, 2018, 33(9): 3-5.
     [3] Li, F., Zou, T. Q. National Cultural Park: logic, origins and implications [J]. Tourism Tribune, 2021, 36(1): 14-26.
     [4] Cheng, R. F., Xu, C. C. A study on the spatial structure layout and development strategy of the cultural tourism belt of the Great Wall [J]. Economy and Management, 2022, 36(1): 58-64.
     [5] Li, S., Zhu, C. Research on land space evaluation of engineering universities based on visual perception [J]. Areal Research and Development, 2022, 41(3): 49-54, 74.
     [6] Sun, B. L., Guo, F. H., Li, R. J., et al. Linear cultural heritage landscape visual perception location model and demonstration [J]. Progress in Geography, 2024, 43(1): 80-92.
     [7] Ye, Y. J., Li, R. J., Fu, X. Q., et al. A DEM based semantic perception of culture landscape in the tourist destination of the western Qing tombs [J]. Journal of Geo-information Science, 2012, 14(5): 576-583.
     [8] Li, R. J., Gu, F., Guo, F. H., et al. Cultural landscape perception degree model and perception function division based on DEM of traffic line: A case study of Zijingguan Great Wall [J]. Scientia Geographica Sinica, 2015, 35(9): 1086-1094.
     [9] Guo, F. H., Cheng, L. P., Fu, X. Q., et al. Calculation model of tourist’s landscape perception degree within destination based on grid data structure [J]. Areal Research and Development, 2018, 37(1): 125-130.
     [10] Guo, F. H., Sun, B. L., Li, J. H., et al. The Great Wall visual landscape resources and its perception location calculation method [J]. Geography and Geo-Information Science, 2022, 38(6): 9-16.
     [11] Fei, L. F., He, J., Ma, C. Y., et al. Three dimensional Douglas-Peucker algorithm and the study of its application to automated generalization of DEM [J]. Acta Geodaetica et Cartographica Sinica, 2006, (3): 278-284.