Surface Heat Island in Shanghai and Its Relationship with Urban Development from 1989 to 2013

Table 1

Threshold values for LST classification. μ is the average value of LST; std is the standard deviation of LST.

LST category	Range
Very low	<   − 1 std
Low	− 1 std ≤ <   − std/3
Medium	− std/3 ≤ ≤ + std/3
High	+ std/3 < < + 1 std
Very high	≥ + 1 std