Question

我正在编写一个端点，它响应半径内最近的目的地以及给定坐标的距离。我使用 mongodb v2.4 作为数据存储的节点。所有位置数据都以GeoJson格式存储，并且在集合上创建了2dsphere索引。

db.dest.geoNear(lon,lat,
                {num: 30, maxDistance: 20000, query: {someQuery for filtering}
                , spherical: true, distanceMultiplier: 6378.1}
                , function(err, results){})

maxDistance以米为单位，如docs中所述，distanceMultiplier为地球半径。但不知何故，maxDistance被忽略了。以下是示例输出

{ results:
   [ { dis: 4.755328392420995, obj: [Object] },
     { dis: 4.807060479634336, obj: [Object] },
     { dis: 5.492899524461121, obj: [Object] },
     { dis: 5.511199055273086, obj: [Object] },
     { dis: 5.511199055273086, obj: [Object] },
     { dis: 5.660463080160375, obj: [Object] },
     { dis: 5.682780578954481, obj: [Object] },
     { dis: 5.803407121966422, obj: [Object] },
     { dis: 5.89496185238861, obj: [Object] },
     { dis: 5.912218148470887, obj: [Object] },
     { dis: 6.043122792876154, obj: [Object] },
     { dis: 6.138052836083365, obj: [Object] },
     { dis: 6.152973556017727, obj: [Object] },
     { dis: 6.895647639041904, obj: [Object] },
     { dis: 7.487292026198752, obj: [Object] },
     { dis: 7.487292026198752, obj: [Object] },
     { dis: 8.18958659411917, obj: [Object] },
     { dis: 8.18958659411917, obj: [Object] },
     { dis: 8.18958659411917, obj: [Object] },
     { dis: 116.1262295642328, obj: [Object] },
     { dis: 197.59476541200738, obj: [Object] },
     { dis: 281.1553130990714, obj: [Object] },
     { dis: 293.0284376976589, obj: [Object] },
     { dis: 293.0961663596255, obj: [Object] },
     { dis: 293.10437722899286, obj: [Object] },
     { dis: 293.3819790311049, obj: [Object] },
     { dis: 293.5152536606294, obj: [Object] },
     { dis: 293.5332617516882, obj: [Object] },
     { dis: 293.5546344697255, obj: [Object] },
     { dis: 294.7790206142557, obj: [Object] } ],
  stats:
   { nscanned: 470,
     objectsLoaded: 470,
     avgDistance: 102.08913656122567,
     maxDistance: 294.7790206142557,
     time: 37 },
  ok: 1 }

如您所见，尾随条目超出20公里半径。我做错了什么？

Mongodb geoNear忽略maxDistance

0 个答案: