“…Remote sensing images can provide large-scale study with reliable data sources and some landscape metrics are commonly used for landscape pattern analysis. Nevertheless, Yang et al (2009) pointed out that currently used metrics to quantify the structure of urban trees, such as canopy cover (Scott et al, 1998), leaf area index (Xiao et al, 2000), total leaf biomass (Nowak and Crane, 2002), leaf area density (Kenney, 2000), and green plot ratio (Ong, 2003), were not suitable for simulating visual effects of urban trees. Different tree species have a diversity of spatial structures.…”