Question

在下面发布的查询中，我想查询以下信息

    ST_Transform(ST_SetSRID(ST_GeomFromGeoJSON(feature->>'geometry'),4326),25832) AS LIDARDataPolygonsAsGeometry

featuresCollection 是一个 geojson 对象。

如何从 geojson 对象查询？

    query="""   
            WITH data AS (
                SELECT '{featuresCollection}'::json AS featuresCollection
            )
            SELECT 
                LIDARDataPolygonsAsGeometry,
            FROM (
                SELECT 
                    ST_Transform(ST_SetSRID(ST_GeomFromGeoJSON(feature->>'geometry'),4326),25832) AS LIDARDataPolygonsAsGeometry
                
            FROM (SELECT json_array_elements(featuresCollection->'features') AS feature 
                    FROM data) AS f) j
            GROUP BY LIDARDataPolygonsAsGeometry
        """.format(table=config['PostgreDB']['table_name_test'], width=config['Grid']['cell_width'], height=config['Grid']['cell_height'],bufferRadius=config['Grid']['buffer_radius'],featuresCollection=featuresCollection)

Answer 1

只需在子查询中解压缩您的特征集合，提取几何图形并应用您想要的转换，例如来自名为 account.drafts.get(id=reply_to_item_id) 的表，其中列 t 包含 GeoJSON 字符串：

geojson

如何从geojson对象查询？

1 个答案: