I've stuck with a problem of matching items inside a polygon (simple box). I can't figure out why the item which is inside the queried box is not resulting. So here what i have:
>db.testing.getIndexes();
{
"0" : {
"v" : 1,
"key" : {
"_id" : 1
},
"ns" : "test.testing",
"name" : "_id_"
},
"1" : {
"v" : 1,
"key" : {
"point" : "2dsphere"
},
"ns" : "test.testing",
"name" : "2dsphere_index"
}
}
Here is my documents (i've tested different formats):
>db.testing.find();
{
"_id" : ObjectId("5439c9c61120c95f4c50a369"),
"point" : {
"lng" : -80.087535,
"lat" : 42.054246
}
}
{
"_id" : ObjectId("5439cc6d1120c95f4c50a36a"),
"point" : {
"type" : "Point",
"coordinates" : [
-80.087535,
42.054246
]
}
}
And here is query:
>db.testing.find({"point": {"$geoWithin": {
"$geometry": {
"type": "Polygon",
"coordinates": [
[
[-80.267831,42.050312],
[-80.267831,45.003652],
[-73.362579,45.003652],
[-73.362579,42.050312],
[-80.267831,42.050312]
]
]
}
}}})
But the problem is that it returns zero results!
If you not sure, that point is really in square, than copy this:
{"type":"GeometryCollection","geometries":[{"type":"Point","coordinates":[-80.087535,42.054246]},{"type":"Polygon","coordinates":[[[-80.267831,42.050312],[-80.267831,45.003652],[-73.362579,45.003652],[-73.362579,42.050312],[-80.267831,42.050312]]]}]}
and check it here.
I'm confused, could somebody help me with this please?
Thanks in advance!
Update:
Also, those points is got found when we decrease polygon area, for example, to:
[[-80.159937,42.050312],[-80.05204,42.050312],[-80.05204,42.09646],[-80.159937,42.09646],[-80.159937,42.050312]]
If it's needed i could provide like 100 of such points. For example one more strange point:
{"type":"Point","coordinates":[-76.537071,42.058731]}
Update:
Here is a file with points collection dump (around 700 points).
MongoDB (2d sphere index) uses Geodesic to build polygons, which means the shortest line between two points.
This is how it looks on sphere:
And this is how it looks on plain:
Zoomed in image shows that point really not in square:
Related
I've a BigChainDB docker container running in my machine and I'm trying to store and retrieve geospatial data.
I've created through the MongoDB interface a 2dsphere index "location" in the "metadata" collection.
I've checked with the command:
db.people.getIndexes()
And I think that everything it's ok, in fact the result is this:
{
"v" : 2,
"key" : {
"loc" : "2dsphere"
},
"name" : "loc_2dsphere",
"ns" : "bigchain.metadata",
"2dsphereIndexVersion" : 3
}
The document that I've inserted to try some spatial queries is (this is the result of a db.metadata.findOne() query):
{
"_id" : ObjectId("5ccab10a2ce1b70022823a0f"),
"id" : "752ee9abccf83c7fd25d86c9a7d12229ae292fa27544f6881f1dbf97ccd8b413",
"metadata" : {
"location" : {
"type" : "Point",
"coordinates" : [
22.170872,
113.578749
]
}
}
}
But when I use this spatial query nothing is retrieved:
db.metadata.find(
{
"metadata": {
"location": {
$near: {
$geometry: {
type: "Point" ,
coordinates: [ 22 , 113 ]
},
}
}
}
})
I'm doing anything wrong, or is there the possibility that the index doesn't work?
There are a couple of issues here.
The first is that the index is on the field loc whereas your query is querying metadata.location.
If you try creating a 2dsphere index on metadata.location you will see the 2nd error:
"errmsg" : "invalid point in geo near query $geometry argument: { type: \"Point\", coordinates: [ 22.0, 113.0 ] } longitude/latitude is out of bounds, lng: 22 lat: 113",
This error shows that the GEOJSON point defined in your document is invalid, as the latitude value of 113 is outside the acceptable range of [-90, 90].
You would need to correct the data to be valid GEOJSON before indexing.
When I am firing this query on MongoDB, I am getting all the places in the proximity of 500 miles to the specified co-ordinates. But I want to know the exact distance between the specified co-ordinates and the result location.
db.new_stores.find({ "geometry": { $nearSphere: { $geometry: { type: "Point", coordinates: [ -81.093699, 32.074673 ] }, $maxDistance: 500 * 3963 } } } ).pretty()
My Output looks like:
{
"_id" : ObjectId("565172058bc200b0db0f75b1"),
"type" : "Feature",
"geometry" : {
"type" : "Point",
"coordinates" : [
-80.148826,
25.941116
]
},
"properties" : {
"Name" : "Anthony's Coal Fired Pizza",
"Address" : "17901 Biscayne Blvd, Aventura, FL"
}
}
I also want to know the distance of this place from the specified co-ordinate. I created 2dsphere index on geometry.
You can use the $geoNear aggregate pipeline stage to produce a distance from the queried point:
db.new_stores.aggregate([
{ "$geoNear": {
"near": {
"type": "Point",
"coordinates": [ -81.093699, 32.074673 ]
},
"maxDistance": 500 * 1609,
"key" : "myLocation",
"spherical": true,
"distanceField": "distance",
"distanceMultiplier": 0.000621371
}}
]).pretty()
This allows you to specify "distanceField" which will produce another field in the output documents containing the distance from the queried point. You can also use "distanceMultiplier" to apply any conversion to the output distance as required ( i.e meters to miles, and noting that all GeoJSON distances are returned in meters )
There is also the geoNear command with similar options, but it of course does not return a cursor as output.
if you have more than one 2dsphere, you should specify a "key".
MongoDB provides a $geoNear aggregator for calculating the distance of documents in a collection with GeoJson coordinates.
Let us understand it with a simple example.
Consider a simple collection shops
1. Create Collection
db.createCollection('shops')
2. Insert documents in shops collections
db.shops.insert({name:"Galaxy store",address:{type:"Point",coordinates:[28.442894,77.341299]}})
db.shops.insert({name:"A2Z store",address:{type:"Point",coordinates:[28.412894,77.311299]}})
db.shops.insert({name:"Mica store",address:{type:"Point",coordinates:[28.422894,77.342299]}})
db.shops.insert({name:"Full Stack developer",address:{type:"Point",coordinates:[28.433894,77.334299]}})
3. create GeoIndex on "address" fields
db.shops.createIndex({address: "2dsphere" } )
4. Now use a $geoNear aggregator
to find out the documents with distance.
db.shops.aggregate([{$geoNear:{near:{type:"Point",coordinates:[28.411134,77.331801]},distanceField: "shopDistance",$maxDistance:150000,spherical: true}}]).pretty()
Here coordinates:[28.411134,77.331801] is the center position or quired position from where documents will be fetched.
distanceField:"shopDistance" , $geoNear Aggregator return shopDistance as fields in result.
Result:
{ "_id" : ObjectId("5ef047a4715e6ae00d0893ca"), "name" : "Full Stack developer", "address" : { "type" : "Point", "coordinates" : [ 28.433894, 77.334299 ] }, "shopDistance" : 621.2848190449148 }
{ "_id" : ObjectId("5ef0479e715e6ae00d0893c9"), "name" : "Mica store", "address" : { "type" : "Point", "coordinates" : [ 28.422894, 77.342299 ] }, "shopDistance" : 1203.3456146763526 }
{ "_id" : ObjectId("5ef0478a715e6ae00d0893c7"), "name" : "Galaxy store", "address" : { "type" : "Point", "coordinates" : [ 28.442894, 77.341299 ] }, "shopDistance" : 1310.9612119555288 }
{ "_id" : ObjectId("5ef04792715e6ae00d0893c8"), "name" : "A2Z store", "address" : { "type" : "Point", "coordinates" : [ 28.412894, 77.311299 ] }, "shopDistance" : 2282.6640175038788 }
Here shopDistance will be in meter.
maxDistance -> Optional. The maximum distance from the center point that the documents can be. MongoDB limits the results to those documents that fall within the specified distance from the center point.
Specify the distance in meters if the specified point is GeoJSON and in radians if the specified point is legacy coordinate pairs.
In the docs it says if you use legacy pairs , eg : near : [long , lat] , then specify the maxDistance in radians.
If you user GeoJSON , eg : near : { type : "Point" , coordinates : [long ,lat] },
then specify the maxDistance in meters.
Use $geoNear to get the distance between a given location and users.
db.users.aggregate([
{"$geoNear": {
"near": {
"type": "Point",
"coordinates": [ longitude, latitude]
},
"distanceField": "distance",
"distanceMultiplier": 1/1000,
"query": {/* userConditions */},
}}
]).pretty()
IMAGE OF MY DOCUMENT
This is one of my document with trip detailS.The return ride taking passenger will have his drop latlong of one document equal to pickup lat long of another document.But I am not able to query with taking one field and query with all other documents matching the condition.
{
"_id" : ObjectId("5a1058cd2514972098b5b4e6"),
"trip_id" : 895728,
"pass_id" : 1,
"driver_id" : 5119,
"pick_lat" : 16.863973,
"pick_lon" : 96.11646259999999,
"drop_lat" : 16.806106699999997,
"drop_lon" : 96.15429830000001,
"pickup_date" : ISODate("2017-10-27T13:00:58.000+05:30"),
"drop_date" : ISODate("2017-10-27T14:10:21.000+05:30"),
"distance" : 11.13,
"coordinates" : [
96.11646259999999,
16.863973
],
"type" : "Point",
"
loglat" : {
"type" : "Point",
"coordinates" : [
96.11646259999999,
16.863973
]
}
},
the mongodb document 'contents' is
{
"_id" : ObjectId("57bd1ff410ea3c38386b9194"),
"name" : "4Fingers",
"locations" : [
{
"id" : "locations1",
"address" : "68 Orchard Rd, #B1-07 Plaza Singapura, Plaza Singapura, Singapura 238839",
"phone" : "+65 6338 0631",
"openhours" : "Sunday-Thursday: 11am - 10pm \nFriday/Saturday/Eve of PH*: 11am - 11pm",
"loc" : [
"1.300626",
"103.845061"
]
}
],
"comments" : [ ],
"modified" : 1472271793525,
"created" : 1472012276724,
"createdby" : "Admin",
"modifiedby" : "Admin",
"createdipaddress" : "localhost",
"modifiedipaddress" : null,
"types" : "Restaurant",
"category" : "FoodAndBeverages",
"logo" : "logo4Fingers.png",
"tags" : "western, chicken, restaurant, food, beverages"
}
I want to find the nearest place to my location that i get from HTML5 navigation. How do i query it? Data should be sorted in near to far order.
Thank you.
To query mongodb geospatial data first you need a geo spatial index on your location field.
Your location field is a string, it needs to be a numeric type, you need to update your data accordingly.
Create your index on numerical location data:
db.collection.createIndex( { "locations.loc" : "2d" });
Query:
var projection = {"locations.loc":1};
var query = {"locations.loc": {"$near":[1.300626, 103.845061], "$maxDistance": 0.5}};
db.collection.find(query, projection).pretty();
//result:
{
"_id" : ObjectId("57bd1ff410ea3c38386b9194"),
"locations" : [
{
"loc" : [
1.300626,
103.845061
]
}
]
}
var query2 = {"locations.loc": {"$near":[2.300626, 103.845061], "$maxDistance": 0.5}};
db.collection.find(query2, projection).pretty();
//result:
{}
The query result will be sorted always, with nearest as first document.
Thanks Sergiu Zaharie.
It's working.
Then how can i returned all the field instead of returning this field only.
{
"_id" : ObjectId("57bd1ff410ea3c38386b9194"),
"locations" : [
{
"loc" : [
103.845061,
1.300626
]
}
]
}
//edit
Solved.
i just clear the projection then it work like charm.
Thank you.
When I am firing this query on MongoDB, I am getting all the places in the proximity of 500 miles to the specified co-ordinates. But I want to know the exact distance between the specified co-ordinates and the result location.
db.new_stores.find({ "geometry": { $nearSphere: { $geometry: { type: "Point", coordinates: [ -81.093699, 32.074673 ] }, $maxDistance: 500 * 3963 } } } ).pretty()
My Output looks like:
{
"_id" : ObjectId("565172058bc200b0db0f75b1"),
"type" : "Feature",
"geometry" : {
"type" : "Point",
"coordinates" : [
-80.148826,
25.941116
]
},
"properties" : {
"Name" : "Anthony's Coal Fired Pizza",
"Address" : "17901 Biscayne Blvd, Aventura, FL"
}
}
I also want to know the distance of this place from the specified co-ordinate. I created 2dsphere index on geometry.
You can use the $geoNear aggregate pipeline stage to produce a distance from the queried point:
db.new_stores.aggregate([
{ "$geoNear": {
"near": {
"type": "Point",
"coordinates": [ -81.093699, 32.074673 ]
},
"maxDistance": 500 * 1609,
"key" : "myLocation",
"spherical": true,
"distanceField": "distance",
"distanceMultiplier": 0.000621371
}}
]).pretty()
This allows you to specify "distanceField" which will produce another field in the output documents containing the distance from the queried point. You can also use "distanceMultiplier" to apply any conversion to the output distance as required ( i.e meters to miles, and noting that all GeoJSON distances are returned in meters )
There is also the geoNear command with similar options, but it of course does not return a cursor as output.
if you have more than one 2dsphere, you should specify a "key".
MongoDB provides a $geoNear aggregator for calculating the distance of documents in a collection with GeoJson coordinates.
Let us understand it with a simple example.
Consider a simple collection shops
1. Create Collection
db.createCollection('shops')
2. Insert documents in shops collections
db.shops.insert({name:"Galaxy store",address:{type:"Point",coordinates:[28.442894,77.341299]}})
db.shops.insert({name:"A2Z store",address:{type:"Point",coordinates:[28.412894,77.311299]}})
db.shops.insert({name:"Mica store",address:{type:"Point",coordinates:[28.422894,77.342299]}})
db.shops.insert({name:"Full Stack developer",address:{type:"Point",coordinates:[28.433894,77.334299]}})
3. create GeoIndex on "address" fields
db.shops.createIndex({address: "2dsphere" } )
4. Now use a $geoNear aggregator
to find out the documents with distance.
db.shops.aggregate([{$geoNear:{near:{type:"Point",coordinates:[28.411134,77.331801]},distanceField: "shopDistance",$maxDistance:150000,spherical: true}}]).pretty()
Here coordinates:[28.411134,77.331801] is the center position or quired position from where documents will be fetched.
distanceField:"shopDistance" , $geoNear Aggregator return shopDistance as fields in result.
Result:
{ "_id" : ObjectId("5ef047a4715e6ae00d0893ca"), "name" : "Full Stack developer", "address" : { "type" : "Point", "coordinates" : [ 28.433894, 77.334299 ] }, "shopDistance" : 621.2848190449148 }
{ "_id" : ObjectId("5ef0479e715e6ae00d0893c9"), "name" : "Mica store", "address" : { "type" : "Point", "coordinates" : [ 28.422894, 77.342299 ] }, "shopDistance" : 1203.3456146763526 }
{ "_id" : ObjectId("5ef0478a715e6ae00d0893c7"), "name" : "Galaxy store", "address" : { "type" : "Point", "coordinates" : [ 28.442894, 77.341299 ] }, "shopDistance" : 1310.9612119555288 }
{ "_id" : ObjectId("5ef04792715e6ae00d0893c8"), "name" : "A2Z store", "address" : { "type" : "Point", "coordinates" : [ 28.412894, 77.311299 ] }, "shopDistance" : 2282.6640175038788 }
Here shopDistance will be in meter.
maxDistance -> Optional. The maximum distance from the center point that the documents can be. MongoDB limits the results to those documents that fall within the specified distance from the center point.
Specify the distance in meters if the specified point is GeoJSON and in radians if the specified point is legacy coordinate pairs.
In the docs it says if you use legacy pairs , eg : near : [long , lat] , then specify the maxDistance in radians.
If you user GeoJSON , eg : near : { type : "Point" , coordinates : [long ,lat] },
then specify the maxDistance in meters.
Use $geoNear to get the distance between a given location and users.
db.users.aggregate([
{"$geoNear": {
"near": {
"type": "Point",
"coordinates": [ longitude, latitude]
},
"distanceField": "distance",
"distanceMultiplier": 1/1000,
"query": {/* userConditions */},
}}
]).pretty()