Convert JSON containing geometry to postgreSQL - json

Question

I have a JSON file that contains the attribute of several parks along with location (geometry) as a point. I was wondering how to convert the JSON to postgreSQL format. Indeed, I have tried several ways such as SQLizer and MapForce, but I was not able to convert them. Is there any way to convert this JSON which has geometry, to postgreSQL format?
I appreciate any help.
Below you can find the script.
var lenneparks = {
"type": "FeatureCollection",
"crs": {
"type": "name",
"properties": {
"name": "urn:ogc:def:crs:OGC:1.3:CRS84"
}
},
"features": [
{
"type": "Feature",
"properties": {
"place": "Aachen Kurpark",
"year": "1853 (Hi)",
"text": "Elisengarten, kleine Parkanlage in der Innenstadt, rückwärtig vom Elisenbrunnen"
},
"geometry": {
"type": "Point",
"coordinates": [
6.086027,
50.774247
]
}
},
{
"type": "Feature",
"properties": {
"place": "Aachen",
"year": "ca. 1862 (Hi)",
"text": "Staatsprokurator Dubusc"
},
"geometry": {
"type": "Point",
"coordinates": [
6.0838868,
50.7653455
]
}
}
]
};

Answer 1

EDIT 1: Corrected SQL comments
Have you tried the PostGIS extension? It comes with really handy functions to import such data, such as:
-- To create a geometry object from your GeoJSON
SELECT ST_GeomFromGeoJSON('{"type":"Point","coordinates":[-48.23456,20.12345]}') As geometry;
-- To see the WKT of your GeoJSON
SELECT ST_AsText(ST_GeomFromGeoJSON('{"type":"Point","coordinates":[-48.23456,20.12345]}')) As geometry;
EDIT 2: Creating records for each geometry
This function will create a table containing one record for each json element in the array features, from there you can start parsing the data you need for creating your tables... I hope it helps:
CREATE TEMPORARY TABLE features AS
SELECT json_array_elements('{
"type": "FeatureCollection",
"crs": {
"type": "name",
"properties": {
"name": "urn:ogc:def:crs:OGC:1.3:CRS84"
}
},
"features": [
{
"type": "Feature",
"properties": {
"place": "Aachen Kurpark",
"year": "1853 (Hi)",
"text": "Elisengarten, kleine Parkanlage in der Innenstadt, rückwärtig vom Elisenbrunnen"
},
"geometry": {
"type": "Point",
"coordinates": [
6.086027,
50.774247
]
}
},
{
"type": "Feature",
"properties": {
"place": "Aachen",
"year": "ca. 1862 (Hi)",
"text": "Staatsprokurator Dubusc"
},
"geometry": {
"type": "Point",
"coordinates": [
6.0838868,
50.7653455
]
}
}
]
}'::JSON -> 'features') as features;
SELECT * FROM features;
EDIT 3: Query to extract info from json table
SELECT
features -> 'geometry' -> 'coordinates' -> 0 AS lat,
features -> 'geometry' -> 'coordinates' -> 1 AS lon,
features -> 'properties' -> 'place'::TEXT,
features -> 'properties' -> 'year'::TEXT,
features -> 'properties' -> 'text'::TEXT
FROM features;
EDIT 4: Extracting geometries from the json table and converting them into WKT and Geometry
SELECT ST_GeomFromGeoJSON((features -> 'geometry')::text)
FROM features;
SELECT ST_AsText(ST_GeomFromGeoJSON((features -> 'geometry')::TEXT))
FROM features;