CODEWITHSUNDEEP
javaspringmongodbgeolocation
aymeba
aymeba

Reputation: 934

MongoDB Geolocation using with Spring MVC

I try to implement a GPS tracking service for my application. I've a service to push geolocation data into mongodb which works very well. Problem is that each vehicle must send a data in each 20 seconds.

As a requirement i should show the latest 24 hours data in google maps which makes a problem to receive a huge data set. (4320 for one vehicle). Is there any best practice in mongo or google maps to receive less data and show a line as the history? (Response is "json")

Upvotes: 1

Views: 352

Answers (1)

Benjamin M
Benjamin M

Reputation: 24527

I assume your JSON looks like this:

{
  id: 42,
  car_id: 102,
  coordinates: [
    { lat: ..., lon: ..., timestamp: ... },
    { lat: ..., lon: ..., timestamp: ... },
    { lat: ..., lon: ..., timestamp: ... },
    ...
  ]
}

If you use JSON, the there are only 4 ways to reduce the size:

  1. Remove unused data

    1. You could remove duplicate entries from your list. If the car stands still for an hour, you will have 180 identical entries in a row. You could only keep a single one, because the drawn line on the map won't look different.

    2. Remove the timestamp if you don't need it. If the array is ordered, you might not need a timestamp for sorting.

  2. Shrink your data representation

    1. Each character makes a difference, if you've got 4320 entries. So you could replace for example lat and lon with x and y. That reduces the size by 4*4320 = 17280 characters.

    2. Change the representation. If you don't need the timestamp, you could simple reduce your data structure to coordinates: [[1,2],[3,4],[5,6],...] (where 1, 3 and 5 are the lat part and 2, 4, 6 are the lon part of the coordinate). This may reduce the JSON size by another 20-40%.

  3. Compress the data

    1. If possible use GZIP (or any other compression algorithm). That way you can easily shrink the JSON output to 10-20% of the original size.

  4. Use a more compact data format

    1. Have a look at Protocol Buffers (from Google). Spring supports it and there's also a JavaScript library.

    2. There are a few other protocols that can reduce the data size. I.e. Thrift (from Apache / Facebook), but I don't know if Spring / JavaScript supports it.

That's basically all you can do.

Upvotes: 1

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