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  • 空间表转为geojson

    1. 把空间表转为geojson
    WITH cc_c AS (
    SELECT name,name_2,name_3,st_transform(st_simplify(st_transform(geom,3857), 7827),4326) from countries_4326_s  
    ),
     features AS (
        SELECT
            st_asgeojson (cc_c.*) :: json AS feature
        FROM
            cc_c
    ) SELECT
        json_build_object (
            'type',
            'FeatureCollection',
            'features',
            json_agg (features.feature)
        )
    FROM
        features
    WITH cc_c AS (
        SELECT
            NAME,
            name_2,
            name_3,
            st_transform (
                st_simplify (
                    st_transform (geom, 3857),
                    7827
                ),
                4326
            )
        FROM
            countries_4326_s
    ),
     features AS (
        SELECT
            st_asgeojson (cc_c.*) :: json AS feature
        FROM
            cc_c
    ) SELECT
        json_build_object (
            'type',
            'FeatureCollection',
            'features',
            json_agg (features.feature)
        )
    FROM
        features
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  • 原文地址:https://www.cnblogs.com/lishanyang/p/15723455.html
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