[TYPO3-mvc] How would you realize a radius search

[Philipp]

Hy, how would you do - in etxbase - a radiussearch? What is the best approach?
Executing Raw queries?
Set a distance property in the model, that will be updated manually,  get all Data and then extract those with the lowest distance?
Get all matching and then order them by distance using a controller action?

Or could i write a extension for extbase itself?

What i would need is to add a field to my result called distance and order my results by that field. Is there a nice way to do this in extbase?