1. Chinese Academy of Culture Heritage, Beijing 100029, China 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China 3. Ministry of Education Key Laboratory on 3D Information Acquisition & Application; Capital Normal University，Beijing 100048, China
Abstract：Yungang Grottoes were built in the mid-5th century A.D., and named as a UNESCO World Heritage site in 2001. Most of the grottoes were built on the feldspathic quartz sandstones. They were seriously damaged due to the environmental impact. The main form of the weathering is the powdered weathering. The weathering conditions are generally characterized by electrical sounding, penetration resistance, molecular spectroscopy, etc. However, although these methods can give good results about the weathering conditions for a specified sample or site, they are not suitable for providing a global profile of the weathering conditions. The present paper provides a method for effectively and roundly assessing the overall powdered weathering conditions of the Yungang Grottoes based on hyperspectral imaging. Powdered weathering could change the structure and granularity of the sandstone, and thus change the spectral reflectance of the sandstone surface. Based on the hyperspectral data collected from 400 nm to 1 000 nm and normalized by log residuals method, the powdered weathering conditions of the sandstones were classified into strong weathering and weak weathering. The weathering profile was also mapped in the Envi platform. The mapping images were verified using the measured hyperspectal data of the columns in front of the 9th and 10th grottoes as the examples. The mapping images were substantially fitted to the real observations, showing that hyperspectral imaging can be used to estimate the overall powdered weathering of the sandstones.
周 霄1，高 峰1, 2，张爱武3，周科朝2 . VIS/NIR高光谱成像在中国云冈石窟砂岩风化状况分布研究中的进展[J]. 光谱学与光谱分析, 2012, 32(03): 790-794.
ZHOU Xiao1, GAO Feng1, 2, ZHANG Ai-wu3, ZHOU Ke-chao2 . Advance in the Study of the Powdered Weathering Profile of Sandstone on China Yungang Grottoes Based on VIS/NIR Hyperspectral Imaging . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2012, 32(03): 790-794.
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