jiayuasu commented on issue #814:
URL: https://github.com/apache/sedona/issues/814#issuecomment-1495452309
@conect
Test data:
```
{ "type": "FeatureCollection",
"features": [
{ "type": "Feature",
"geometry": {"type": "Point", "coordinates": [102.0, 0.5]},
"properties": {"prop0": "value0"}
},
{ "type": "Feature",
"geometry": {
"type": "LineString",
"coordinates": [
[102.0, 0.0], [103.0, 1.0], [104.0, 0.0], [105.0, 1.0]
]
},
"properties": {
"prop0": "value1",
"prop1": 0.0
}
},
{ "type": "Feature",
"geometry": {
"type": "Polygon",
"coordinates": [
[ [100.0, 0.0], [101.0, 0.0], [101.0, 1.0],
[100.0, 1.0], [100.0, 0.0] ]
]
},
"properties": {
"prop0": "value2",
"prop1": {"this": "that"}
}
}
]
}
```
Code:
```scala
val schema = "type string, features array<struct<type string, geometry
string, properties map<string, string>>>"
val df = sparkSession.read.schema(schema).option("multiLine",
"true").json(geojsonFeatureCollection)
val parsedDf = df.selectExpr("explode(features) as
features").select("features.*")
.withColumn("geometry", expr("ST_GeomFromGeoJSON(geometry)"))
.withColumn("prop0",
expr("properties['prop0']")).drop("properties").drop("type")
parsedDf.show()
parsedDf.printSchema()
```
Output
```
+--------------------+------+
| geometry| prop0|
+--------------------+------+
| POINT (102 0.5)|value0|
|LINESTRING (102 0...|value1|
|POLYGON ((100 0, ...|value2|
+--------------------+------+
root
|-- geometry: geometry (nullable = false)
|-- prop0: string (nullable = true)
```
To SpatialRDD and saveAsGeoJSON again
```
var spatialRDD = Adapter.toSpatialRdd(parsedDf, "geometry")
spatialRDD.saveAsGeoJSON("testOutput.json")
```
testOutput.json content
```
{"type":"Feature","geometry":{"type":"Point","coordinates":[102.0,0.5]},"properties":{"prop0":"value0"}}
{"type":"Feature","geometry":{"type":"LineString","coordinates":[[102.0,0.0],[103.0,1.0],[104.0,0.0],[105.0,1.0]]},"properties":{"prop0":"value1"}}
{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[100.0,0.0],[101.0,0.0],[101.0,1.0],[100.0,1.0],[100.0,0.0]]]},"properties":{"prop0":"value2"}}
```
This works for Scala, Java, Python, R. The detailed explanation can be found
here:
https://sedona.apache.org/1.4.0/tutorial/sql/#load-geojson-using-spark-json-data-source
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