MongoDB:无法规范化查询:BadValue错误的地理查询

Question

我索引了2dsphere上的字段loc,我无法在Point类型的GeoJson数据上运行geowithin查询.

这是查询:

 db.test.find( { loc :
                     { $geoWithin :
                        { $geometry :
                           { type : "Polygon" ,
                             coordinates : [ [ [-74.6862705412253, 40.42341005] , 
                                               [-75.0846179, 39.9009465 ], 
                                               [-74.20570119999999, 41.0167639 ]
                                             ]
                                           ]
                           } 
                         } 
                      } 
                 } 

输出:

  uncaught exception: error: {
"$err" : "Can't canonicalize query: BadValue bad geo query",
"code" : 17287
}

文件结构:

         {
           "_id" : ObjectId("53d15e7132e7b7978c472e6e"),
           "loc" : {
                  "type" : "Point",
                   "coordinates" : [ -74.6862705412253, 40.42341005 ]
                   },

         }

索引:

{
"0" : {
    "v" : 1,
    "key" : {
        "_id" : 1
    },
    "name" : "_id_",
    "ns" : "collab.test"
},
"1" : {
    "v" : 1,
    "key" : {
        "loc" : "2dsphere"
    },
    "name" : "TestLocationIndex",
    "ns" : "collab.test",
    "2dsphereIndexVersion" : 2
}

}

但是,$ Polygon在相同的文档上工作正常.我试图理解为什么geowithin不起作用？

Answer 1

这是因为您的多边形未关闭,实际上您需要至少四个点才能生成有效多边形,最后重复第一个点,请参阅GeoJSON Polygon文档.不得不说,错误信息可能会更有帮助.对于众所周知的文本(WKT)和众所周知的二进制(WKB)多边形格式也是如此,因此不是GeoJSON的特性.

您的查询应该像这样工作:

db.test.find({loc :
                {$geoWithin :
                    {$geometry :
                       {type : "Polygon" ,
                           coordinates : [[[-74.6862705412253, 40.42341005] , 
                                           [-75.0846179, 39.9009465], 
                                           [-74.20570119999999, 41.0167639],
                                           [-74.6862705412253, 40.42341005]]]                                     
                        } 
                    } 
                 } 
             }