[android-developers] Re: Order latitude/longitude list by distance to my current location

If you mean straight line distance and if the locations are reasonably close and/or reasonably well distributed then just do a straightforward trig calculation.

If you want more accuracy use a great circle distance calculation (just Google it).   Assuming you just need a ranking rather than accurate distance I suspect this would be overkill in most real-world situations.

If you had thousands of locations to sort rather than just 200 I would do the simple trig calc, then sort into distance order and then walk the list to see if the distance/separation of adjacent location pairs was within a threshold and do the the gc calc to determine the closest.

On Monday, December 31, 2012 7:32:18 AM UTC-5, Nelson André wrote:

Hello all,

I have a JSON list that I retrive from one website I have that gives me the following fields:

• Name
  
• Latitude
  
• Longitude

This list has around 200 items.

I want to order the list by distance to my current location, closer locations on top.

How may I do this calculation and ordering?

Many Thanks

Nelson

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