Figure 6.
The image comprises four heat maps illustrating temperature data across four years: 1986, 1995, 2005, and 2015. Each map features temperature ranges with a colour gradient indicating values, where the black outlines depict geographical boundaries. The legend below each map specifies temperature categories, identifying high, medium, and low ranges, along with their corresponding values in degrees Celsius. The north arrow is present in the top right of each map. The colour gradients vary between maps, representing changes in temperature over the years, with notable areas marked in different intensities of colours.The evolution of Harbin land temperature of main urban area in four typical years
Source: Created by authors