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    An optimal parameters-based geographical detector model enhances geographic characteristics of explanatory variables for spatial heterogeneity analysis: cases with different types of spatial data

    Access Status
    Fulltext not available
    Authors
    Song, Yongze
    Wang, J.
    Ge, Y.
    Xu, C.
    Date
    2020
    Type
    Journal Article
    
    Metadata
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    Citation
    Song, Y. and Wang, J. and Ge, Y. and Xu, C. 2020. An optimal parameters-based geographical detector model enhances geographic characteristics of explanatory variables for spatial heterogeneity analysis: cases with different types of spatial data. GIScience and Remote Sensing.
    Source Title
    GIScience and Remote Sensing
    DOI
    10.1080/15481603.2020.1760434
    ISSN
    1548-1603
    Faculty
    Faculty of Humanities
    School
    School of Design and the Built Environment
    URI
    http://hdl.handle.net/20.500.11937/79549
    Collection
    • Curtin Research Publications
    Abstract

    © 2020 Informa UK Limited, trading as Taylor & Francis Group. Spatial heterogeneity represents a general characteristic of the inequitable distributions of spatial issues. The spatial stratified heterogeneity analysis investigates the heterogeneity among various strata of explanatory variables by comparing the spatial variance within strata and that between strata. The geographical detector model is a widely used technique for spatial stratified heterogeneity analysis. In the model, the spatial data discretization and spatial scale effects are fundamental issues, but they are generally determined by experience and lack accurate quantitative assessment in previous studies. To address this issue, an optimal parameters-based geographical detector (OPGD) model is developed for more accurate spatial analysis. The optimal parameters are explored as the best combination of spatial data discretization method, break number of spatial strata, and spatial scale parameter. In the study, the OPGD model is applied in three example cases with different types of spatial data, including spatial raster data, spatial point or areal statistical data, and spatial line segment data, and an R “GD” package is developed for computation. Results show that the parameter optimization process can further extract geographical characteristics and information contained in spatial explanatory variables in the geographical detector model. The improved model can be flexibly applied in both global and regional spatial analysis for various types of spatial data. Thus, the OPGD model can improve the overall capacity of spatial stratified heterogeneity analysis. The OPGD model and its diverse solutions can contribute to more accurate, flexible, and efficient spatial heterogeneity analysis, such as spatial patterns investigation and spatial factor explorations.

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