How to store GPS coordinate and search places in a radius from a NoSQL DBMS (like DynamoDB)

Question

My team needs a DBMS like DynamoDB to store large amount of data, principally places and coordinates. I\'ve considered to use some GIS-based DBMS (like PostGIS) with an index on

Answer 1

I'm currently researching this subject myself. I'm using MongoDb (I know you asked for DynamoDb, but you also asked for general NoSql usage) and my code looks like this:

record structure:

public class FrameDocument
{
    [BsonId]
    public Guid Id { get; set; }

    [BsonElement("coordinates")]
    public Point[] Polygon { get; set; }
}

public class Point
{
    [BsonElement("name")]
    public string Orientation { get; set; }

    [BsonElement("loc")]
    public double[] Location { get; set; }
}

connecting and ensuring index:

MongoServer server = MongoServer.Create(connectionString);
MongoDatabase database = server.GetDatabase(databaseName);
database.GetCollection(collectionName).EnsureIndex(IndexKeys.GeoSpatial("coordinates.loc"));

writing:

var items = database.GetCollection(collectionName);
items.InsertBatch(itemsToInsert);

searching:

double[,] points; // define you search coordinates
var items = database.GetCollection(collectionName);
var query = Query.WithinPolygon("coordinates.loc", points);
var cursor = items.Find(query);