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I've got a whole bunch of political boundaries defined in a MongoDB collection, which are (as you might guess) very complex polygons, with thousands of points.

One of the queries I need to run is to retrieve all the boundaries which overlap a rectangular map extent. Right now I'm just running a $geoIntersects query on the polygons, which are 2dsphere-indexed.

Since it's OK if the occasional polygon which doesn't actually overlap the map gets included by accident, I know I could just add a bounding-box property to each document which contains a simple rectangular boundary that includes the whole polygon, then index and run my $geoIntersects query against the boxes. But I'd prefer, if possible, to avoid having to add another property to the documents.

Is there a simpler/more efficient way to do this? Or is the bounding box idea the best option?

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