postgis
Differences
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postgis [2020/02/12 12:03] mantis [Select all geometries in an area] |
postgis [2020/02/12 12:05] mantis [Export table to geojson] |
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| ===== Export table to geojson ===== | ===== Export table to geojson ===== | ||
| - | Building a FeatureCollection ([[https://postgis.net/docs/ST_AsGeoJSON.html|docs]]) | + | Building a FeatureCollection ([[https://postgis.net/docs/ST_AsGeoJSON.html|docs]], [[https://gist.github.com/brambow/889aca48831e189a62eec5a70067bf8e|code snippet]]): |
| + | |||
| + | <code psql> | ||
| + | SELECT json_build_object( | ||
| + | 'type', 'FeatureCollection', | ||
| + | 'crs', json_build_object( | ||
| + | 'type', 'name', | ||
| + | 'properties', json_build_object( | ||
| + | 'name', 'EPSG:4326' | ||
| + | ) | ||
| + | ), | ||
| + | 'features', json_agg( | ||
| + | json_build_object( | ||
| + | 'type', 'Feature', | ||
| + | 'id', id, | ||
| + | 'geometry', ST_AsGeoJSON(the_geom)::json, | ||
| + | 'properties', json_build_object( | ||
| + | 'name', name, | ||
| + | 'frc', frc, | ||
| + | 'fromjunction', fromjunction, | ||
| + | 'tojunction', tojunction, | ||
| + | ) | ||
| + | ) | ||
| + | ) | ||
| + | ) | ||
| + | FROM roadmap_table; | ||
| + | </code> | ||
postgis.txt · Last modified: 2020/02/12 12:06 by mantis
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