db.polygon.drop();
db.polygon.insert([ { "_id" : "Poly1", "shape" : { "type" : "Polygon", "coordinates" : [ [ [0.0000, 0.000],[3.000,0.000],[3.000,3.000],[0.000,3.000], [0.0000, 0.000]]]}},
... { "_id" : "Poly2", "shape" : { "type" : "Polygon", "coordinates" : [ [ [3.00,0.00],[6.00,0.00],[6.00,3.00],[3.00,3.00],[3.00,0.00] ] ] } } ]);
db.polygon.ensureIndex({shape:"2dsphere"});
var box={"type" : "Polygon", "coordinates" : [ [ [ 0.000, 0.0000 ], [ 3.0000, 0.0000 ], [ 3.000, 3.000 ], [ 0.000, 3.000 ], [ 0.000, 0.0000 ] ] ] }
db.polygon.find( {shape: {$geoIntersects: {$geometry: box}}}, {_id:1})
{ "_id" : "Poly1" }