Fig. 5

Archaeological marks on the No.1 mausoleum of the Eastern Mausoleum of Qin State. a The vegetation mark with greener color indicates greater NDVI values, and the subset imagery in the top-right shows the original resolution of average NDVI value; b soil mark with bluer color indicates greater NDMI values, the subset imagery in the top-right shows the original resolution of average NDMI value covering the area of royal tombs