In our Mongo database we have a test polygon defined by the following coordinates:

0.026856601145655,53.3536401702337 -0.018187415636542,53.3543968971421 -0.016935805565727,53.381347118852 -0.01651815359378,53.3903304943447 -
0.001490628678547,53.390079813912 -0.001911439808241,53.3810965200027 0.028136611683245,53.3805896527841 0.026856601145655,53.3536401702337

We then use a within query to see if this polygon lies within a particular area. This one returns the above polygon:

{{ "PId" : ObjectId("5c1bccda3930321b784dbade"), "GeoPnt" : { "$within" : { "$geometry" :

{ "type" : "Polygon", "coordinates" : [[[-33.353119999999997, -50.140853], [-33.353119999999997, 76.184997999999993], [146.24300500000001, 76.184997999999993], [146.24300500000001, -50.140853], [-33.353119999999997, -50.140853]]] }

} } }}

and this one does not:

{{ "PId" : ObjectId("5c1bccda3930321b784dbade"), "GeoPnt" : { "$within" : { "$geometry" :

{ "type" : "Polygon", "coordinates" : [[[-34.353119999999997, -50.140853], [-34.353119999999997, 76.184997999999993], [146.24300500000001, 76.184997999999993], [146.24300500000001, -50.140853], [-34.353119999999997, -50.140853]]] }

} } }}

As you can see the test polygon is well within the polygon defined in both cases.

I have been reading up about "big polygons" but both of these areas do not cover more than half a hemisphere so I have no idea why both of these queries do not work.

We are using Mongo 3.6.5 and version 2.4 of the C# driver using the legacy query methods.