如何从 json/geojson 对象查询

Question

我在名为 geojsonObjectAsString 的对象中有 featureCollection，如下所示。最初，该对象是字典类型，我通过

转换了它

json.dumps(geojsonObjectAsJSON)

我希望能够 select 只有 features、properties 和来自 geojsonObjectAsString 的几何图形。我尝试了以下方法：

query = """SELECT row_to_json('{featuresArray}')
FROM '{featuresArray}'""".format(featuresArray=featuresArray)

但不幸的是我收到以下错误：

FEHLER:  syntax error at »'{"type": "FeatureCollection", "features": [{"type": "Feature", "properties":...

请告诉我如何从 json/geojson 对象查询。

我参考了以下链接： http://www.postgresonline.com/journal/archives/267-Creating-GeoJSON-Feature-Collections-with-JSON-and-PostGIS-functions.html

geojsonObjectAsString:

{"type": "FeatureCollection", "features": [{"type": "Feature", "properties": {"treeID": "99", "XTOP": "338535.01", "YTOP": "5667141.11", "ZTOP": "19.98", "Zmax": "19.98", "Zmean": "1.8232183908046", "Zmin": "-0.03", "ID": "1"}, "geometry": {"type": "Polygon", "coordinates": [[[6.69223420722764, 51.1329165124371], [6.69222819326484, 51.1329081193748], [6.69221180776184, 51.1329013203209], [6.69219149698336, 51.1329073049609], [6.69217949340067, 51.1329244260894], [6.69217956546811, 51.1329430447612], [6.69218526127669, 51.1329578171713], [6.692200130301, 51.1329606289999], [6.69220511560768, 51.1329581192089], [6.69221372090576, 51.1329518135339], [6.69222707128915, 51.132939215911], [6.69223420722764, 51.1329165124371]]]}}, {"type": "Feature", "properties": {"treeID": "109", "XTOP": "338537.53", "YTOP": "5667129.66", "ZTOP": "18.9", "Zmax": "18.9", "Zmean": "0.56044776119403", "Zmin": "-0.04", "ID": "2"}, "geometry": {"type": "Polygon", "coordinates": [[[6.69226547705025, 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Answer 1

一个简单的方法是解析 CTE 中的 json 字符串，并在单独的查询中正确过滤记录，例如从特征集合中仅选择 properties 中的 treeID 等于 99:

的几何图形

WITH j (el) AS ( 
  SELECT json_array_elements('{"type": "FeatureCollection", "features": [{"type": "Feature", "properties": {"treeID": "99", "XTOP": "338535.01", "YTOP": "5667141.11", "ZTOP": "19.98", "Zmax": "19.98", "Zmean": "1.8232183908046", "Zmin": "-0.03", "ID": "1"}, "geometry": {"type": "Polygon", "coordinates": [[[6.69223420722764, 51.1329165124371], [6.69222819326484, 51.1329081193748], [6.69221180776184, 51.1329013203209], [6.69219149698336, 51.1329073049609], [6.69217949340067, 51.1329244260894], [6.69217956546811, 51.1329430447612], [6.69218526127669, 51.1329578171713], [6.692200130301, 51.1329606289999], [6.69220511560768, 51.1329581192089], [6.69221372090576, 51.1329518135339], [6.69222707128915, 51.132939215911], [6.69223420722764, 51.1329165124371]]]}}, {"type": "Feature", "properties": {"treeID": "109", "XTOP": "338537.53", "YTOP": "5667129.66", "ZTOP": "18.9", "Zmax": "18.9", "Zmean": "0.56044776119403", "Zmin": "-0.04", "ID": "2"}, "geometry": {"type": "Polygon", "coordinates": 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) 
SELECT   
  el->'properties' AS properties,
  ST_GeomFromGeoJSON(el->>'geometry') AS features  
FROM j
WHERE el->'properties'->>'treeID' = '99';

演示：db<>fiddle

如何从 json/geojson 对象查询

how to query from json/geojson object

python

postgresql

postgis

geojson