Fig. 18: Spatial distribution of regression coefficients of influencing factors.

a Elevation (Longshan period). b Slope (Longshan period). c Hydrology (Longshan period). d Geo-diversity (Longshan period). e Elevation (Xia Dynasty). f Slope (Xia Dynasty). g Hydrology (Xia Dynasty). h Geo-diversity (Xia Dynasty). i Elevation (Shang Dynasty). j Slope (Shang Dynasty).