mongodb and geospatial schema

Question

im breaking my head with mongo and geospatial, so maybe someone has some idea or solution how to solve this: my object schema is like this sample for geoJSON taken from http://geojson.org/geojson-spec.html.

{
"name":"name",
"geoJSON":{
"type":"FeatureCollection",
"features":[
{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[100,0],[101,0],[101,1],[100,1],[100,0]]]},"properties":{}},
{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[100,0],[101,0],[101,1],[100,1],[100,0]]]},"properties":{}},
{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[100,0],[101,0],[101,1],[100,1],[100,0]]]},"properties":{}}
]}}

additional info: I'm using spring data but that shouldn't influence the answer. main problem is how/where to put indexes in this schema. I need to make a query to find all documents for given Point if some polygon intersects.

thanks in advance.

Philipp Philipp · Accepted Answer · 2013-12-12T21:06:28

By creating a 2d or 2dsphere index on geoJSON.features.geometry you should be able to create an index covering all of the geoJSON-objects.

To get all documents where at least one of the sub-object in the features array covers a certain point, you can use the $geoIntersects operator with a geoJSON Point:

db.yourcollection.find( 
            { `geoJSON.features.geometry` :
              { $geoIntersects :
                { $geometry :
                  { type : "Point" ,
                    coordinates: [ 100.5 , 0.5 ] 
                  } 
                } 
              } 
            } 
          )

mongodb and geospatial schema

1 Answers