Locate the closest coordinate using Meteor/Mongo through manual search

After utilizing the $near command to fetch a list of cities near my current coordinates, I realized that there is an issue. It seems that you can be on the outskirts of a large city but still be closer to the center of the neighboring city than to where you are currently located. To address this, I am interested in incorporating population data into the results to accurately determine city size.

Villages.find({loc: {$near: [lat,long], $maxDistance: 2}}, 
                     {fields: {name: 1, _id: 0}}, 
                     {limit: 1}
                     );

Since it doesn't seem feasible to achieve this using $near, I'm considering manually selecting the nearest cities and factoring in their populations. Would appreciate guidance on how best to approach this task, possibly by implementing haversine or other methods for accurate results?

javascriptmongodbmeteorcoordinatesdistance

Answer №1

Testing this out will be beneficial. Your code has a small technical mistake that might be causing the issue:

 Villages.find({loc: {$near: [long,lat], $maxDistance: 2}}, 
                 {fields: {name: 1, _id: 0}}, 
                 {limit: 1}
                 );

In MongoDB, the order should be long, lat instead of lat, long. It's also important to note that this syntax is outdated and the preferred way now is:

loc: { $near : {
            $geometry : [long, lat],
            $maxDistance : 2
        } }

The structure for loc should resemble this:

loc: {
    type : "Point",
    coordinates : [ long , lat ]
}

Don't forget to create an index for them as well: 

MyCollection._ensureIndex({"loc" : "2dsphere"});

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