Spatiotemporal differentiation and driving mechanisms of high-level Grade A tourist attractions in the Yangtze River Delta City Cluster.

Meanwhile, the values of both the long and short axes of the standard deviation ellipse show an increasing trend during the 20-year period, reflecting a particular diffusion of high-level Class A tourist attractions in the east–west and north–south directions. 3.4 The evolution of spatial distributional correlations By repeatedly comparing the spatial correlation features at different scales, with the help of the creation of a fishing net tool in ArcGIS 10.8 software, we constructed a 10 × 10 km 2 grid of the YRD urban agglomeration and applied the spatial autocorrelation method to analyze the spatial correlation relationship of high, A-level tourist attractions in the region.

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