A Study on the Effects of Roughness on Thermal Infrared Spectral Unmixing of Rock
LI Tian-zi2, 3，LIU Shan-jun1, 2*
1. Key Laboratory of Safe Mining of Deep Metal Mines of Ministry of Education, Northeastern University, Shenyang 110819, China
2. School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
3. School of Surveying and Mapping Land Information Engineering, Henan Polytechnic University, Jiaozuo 454000, China
Abstract The current unmixing of rock thermal infrared spectrum mostly focuses on granule forms, which can’t meet the requirements of high accuracy when applied to natural massive rocks. This paper aims to study the influence of rock surface roughness on spectral unmixing, which will influence the spectral emissivity and unmixing accuracy. Three grades of roughness were defined according to the natural rock surface morphology, and according to their structural forms, three kinds of samples were simulated by the method of mineral block mosaicking. The effects of roughness level on rock spectrum and unmixing were investigated by unmixing experiments using the same and different roughness grades. The results showed that good unmixing could be achieved when the mineral endmember and rock shared the same roughness, while in terms of different roughness grades, 48.3% of the 60 unmixing results presented errors over 5%, and the maximum was 25.3%. Therefore, we suggest that the effects of roughness on spectral unmixing should be completely considered in the quantitative hyperspectral remote sensing of natural massive rock.
[1] Liu D W，Li L，Sun Y. Icarus，2015，253：41.
[2] Thorpe M T，Rogers A D，Bristow T F，et al. Journal of Geophysical Research：Planets，2015，120(11)：1956.
[3] Pan C，Rogers A D，Thorpe M T. Journal of Geophysical Research：Planets，2015，120(11)：1984.
[4] Michelle E M，Victoria E H. Icarus，2010，210：35.
[5] Greenhagen B T，Lucey P G，Wyatt M B，et al. Science，2010，329(5998)：1507.
[6] Farrand W H，Wright S P，Rogers A D，et al. Icarus，2016，275：16.
[7] LIU Shan-jun，ZHUO Jian-ying，WU Li-xin，et al(刘善军，卓建英，吴立新，等). Science & Technology Review(科技导报)，2011，29(35)：24.
[8] Carter A J，Ramsey M S，Durant A J，et al. Journal of Geophysical Research：Solid Earth，2009，114：B02213.
[9] Osterloo M M，Hamiltonb V E. Icarus，2012，220：404.
[10] Hecker C，Meijde M，Meer F D. Earth-Science Reviews，2010，103(1-2)：60.
[11] XIE Tao，LI Ya-ge(谢 韬，李亚阁). Engineering Journal of Wuhan University(武汉大学学报·工学版)，2013，43(3)：345.
[12] LI Xiao-wen，WANG Jin-di(李小文，王锦地). Science Bullion(科学通报)，1999，44(15)：1612.
