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POMongodb geo-spatial query not reporting an error on spherical wrapping, but returning a weird result
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  1. POMongodb geo-spatial query not reporting an error on spherical wrapping, but returning a weird result
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    copied!<p>I have a weird behavior when querying geospatial data.</p> <p>From the <a href="http://www.mongodb.org/display/DOCS/Geospatial+Indexing" rel="nofollow">doc</a>:</p> <blockquote> <p>We don't currently handle wrapping at the poles or at the transition from -180° to +180° longitude, however we detect when a search would wrap and raise an error.</p> </blockquote> <p>However I have one object at <code>[179,0]</code> and if I query for objects near <code>[-179,0]</code> with a max distance of 0.9, the object is returned and the computed distance is 2 degrees. No error is raised.</p> <p>If I query for the same location, but with a max distance of 1.0 the object is not returned and still no error.</p> <p>Is this a bug or do I miss something? I could not find any reported bug about that on jira.</p> <pre><code>PRIMARY&gt; version() version: 2.0.7 PRIMARY&gt; db.runCommand({geoNear:"GeoBug",near:[-179,0],spherical:true,maxDistance:1.0}) { "ns" : "mydb.GeoBug", "near" : "0100000000000000100010100010100000000000100010100010", "results" : [ { "dis" : 0.03490658503988567, (2 degrees) "obj" : { "_id" : ObjectId("5098e71b744eca2df1b325f2"), "location" : { "lonlat" : [ 179, 0 ] } } } ], "stats" : { "time" : 0, "btreelocs" : 0, "nscanned" : 2, "objectsLoaded" : 1, "avgDistance" : 0.03490658503988567, "maxDistance" : 0.03490689563235392 }, "ok" : 1 } PRIMARY&gt; db.runCommand({geoNear:"GeoBug",near:[-179,0],spherical:true,maxDistance:0.9}) { "ns" : "mydb.GeoBug", "near" : "0100000000000000100010100010100000000000100010100010", "results" : [ ], "stats" : { "time" : 0, "btreelocs" : 0, "nscanned" : 1, "objectsLoaded" : 0, "avgDistance" : NaN, "maxDistance" : 0 }, "ok" : 1 } </code></pre>
 

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