Publication Date

August 2022


The spatial layout of land use can reflect the health of urban development and inform the construction of green infrastructure. Many layout measurements have been proposed for lands in homogeneous spaces. Researchers and planners have used them to describe the urban structure and identify current problems in pursuit of problem-oriented optimizations. Now, with the urban expansion and accessibility development, the urban space has gradually changed from homogeneous to heterogeneous. However, the study of land use layout based on heterogeneous space is insufficient. Different land use types are expected to be allocated more scientifically, so providing more objective evidence on the urban land layout is necessary. Among them, the Aggregation-Diffusion status of each type of land is the most basic and vital information. In this paper, the spectral, index, and inversion data of Landsat 8 and Sentinel2 were collected, combined with NPP/VIIRS, and the Weka-EM clustering method was used to determine the boundary of build-up area in Luohe City (China) to obtain our study area. Then, we improve the traditional RAD by measuring roads 'Efficiency value' using Space Syntax: the homogeneous space is weighted to describe the effect of spatial heterogeneity for each land type. Therefore, by comparing the differences in the aggregation-diffusion land layout of these two spaces, the results are as follows: first of all, RAD shows that there is a dense core in Luohe City, in which priority development of ecological land can achieve a multiplier effect with half the effort. Secondly, in AAD, the basic unit based on efficiency value shows apparent spatial heterogeneity in Luohe urban space, represented by the contour line. The benefits of the greenway will be more fully realized where the contours are dense. Thirdly, comparing the description of the Aggregation-Diffusion situation of each land type by RAD and AAD, it can be found that: each land type has a different sensitivity to spatial heterogeneity, and AAD is a more accurate way of spatial description; Both AAD and RAD indicate a significant radial differentiation of land use in Luohe, which means that the significance of greenway construction in this religion is further enhanced. In addition to the greenway’s fundamental ecological implications, it also plays a vital role in facilitating the material-energy flow as well as promoting integration and equitable urban development.



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