![MONGODB GEOSPATIAL INDEX
>db.places.insert({ loc : [ 50 , 30 ] })
>db.places.insert({ loc : { x : 50 , y : 30 } })
>db.places.insert({ loc : { foo : 50 , y : 30 } })
>db.places.insert({ loc : { long : 40.7390,lat: 73.9929 } })
>db.places.ensureIndex( { loc : "2d" } )
>db.places.find( { loc : [50,50] } )
>db.places.find( { loc : { $near : [50,50] } } )
>db.places.find( { loc : { $near : [50,50] } } ).limit(20)
>db.places.find( { loc : { $near : [50,50] , $maxDistance :
5 } } ).limit(20)
2011 6 14](https://image.slidesharecdn.com/lbsmongo-130219003946-phpapp01/85/LBS-with-MongoDB-8-320.jpg)
![MONGODB GEOSPATIAL INDEX
Compound Indexes
>db.places.ensureIndex(
{ location : "2d" , category : 1 }
);
>db.places.find(
{
location : { $near : [50,50] },
category : 'coffee'
});
geoNear Command
> db.runCommand( { geoNear : "places" , near : [50,50],
num : 10 } , query : { category : 'coffee' });
Valid options are: "near", "num", "maxDistance", "distanceMultiplier" and "query"
2011 6 14](https://image.slidesharecdn.com/lbsmongo-130219003946-phpapp01/85/LBS-with-MongoDB-9-320.jpg)
![MONGODB GEOSPATIAL INDEX
public List<DBObject> retriveByLoc(int flag, Double geolong, Double geolat)
{
DBObject cmd = new BasicDBObject(), query = new BasicDBObject();;
query = new BasicDBObject();
query.put("flag", flag);
Object[] location = new Object[]{ geolong, geolat };
cmd = new BasicDBObject();
cmd.put("geoNear", "position");
cmd.put("near", location);
cmd.put("num", 30);
cmd.put("distanceMultiplier", 1.609344*1000*1000); //蟇磯Μ m
cmd.put("spherical", true); //蟇磯Μ螻 ?
cmd.put("query", query);
CommandResult cr = mongoTemplate.getDb().command(cmd);
return (List<DBObject>)cr.get("results");
}
2011 6 14](https://image.slidesharecdn.com/lbsmongo-130219003946-phpapp01/85/LBS-with-MongoDB-10-320.jpg)
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