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  "Description": "Most of the current methods explore spatial association\nusing observations at sample locations, which are defined as\nthe first dimension of spatial association (FDA). The proposed\nconcept of the second dimension of spatial association (SDA),\nas described in Yongze Song (2022)\n<doi:10.1016/j.jag.2022.102834>, aims to extract in-depth\ninformation about the geographical environment from locations\noutside sample locations for exploring spatial association.",
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