Contribution Degree of Different Surface Factors in Urban Interior to Urban Thermal Environment

Figure 2

LST gradient calculation process. A matrix is the ground object classification result with the average LST of each category as the new attribute, is the gradient operator in the X direction, and is the gradient operator in the Y direction. The b matrix is expressed as the gradient relationship between the LST of each pixel and the LST of surrounding pixels obtained by the gradient calculation of the “a” matrix. The c matrix is expressed as using the normalized b matrix as the weight to calculate the LST value of each pixel in the original image affected by 8 adjacent pixels.