Regional Agglomeration Characteristics and Spatiotemporal Evolution of Snow and Ice Sports Industry in Heilongjiang Province from the Perspective of Time and Space

Figure 2

Response surface contour map and the 3D model under the interaction of two factors. (a) The 3D model of interaction between AB factors. (b) Contour map of interaction between AB factors. (c) The 3D model of interaction between AC factors. (d) Contour map of interaction between AC factors. (e) The 3D model of interaction between BD factors. (f) Contour map of interaction between BD factors.

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