Un is the urbanization level around the monastery n. Since the range of NSL data values on the pixels (Dn) was between 0 and 63, the range of Un values was theoretically between 0 and 1, with 0 representing the level of non-urbanization and 1 the maximum level of urbanization.
temple 1993：Monasteries whose Un>0 in 1993
temple 1993=0：Monasteries whose Un=0 in 1993
temple 2003: Monasteries whose Un>0 in 2003
temple 2003=0: Monasteries whose Un=0 in 2003
temple 2013: Monasteries whose Un>0 in 2013
temple 2013=0: Monasteries whose Un=0 in 2013