然后，可以查看一下存储到MongoDB中的矢量数据是什么样的

在命令行中输入：
[csharp] view plaincopyprint 01.> db.sheng.find().limit(1)
> db.sheng.find().limit(1)

结果为
[java script] view plaincopyprint 01.{ "_id" : ObjectId("5371bf4e1dbba31914224563"), "geo" : { "type" : "Polygon", "coordinates" : [ [ [ 89.8496, 14.093 ], [ 90.3933, 14.004 ], [ 90.2708, 13.4708 ], [ 89.7284, 13.5597 ], [ 89.8496, 14.093 ] ] ] }, "pyname" : "sx", "boxtype" : "inter", "date" : "2012/6/5 12:41:42" }
{ "_id" : ObjectId("5371bf4e1dbba31914224563"), "geo" : { "type" : "Polygon", "coordinates" : [ [ [ 89.8496, 14.093 ], [ 90.3933, 14.004 ], [ 90.2708, 13.4708 ], [ 89.7284, 13.5597 ], [ 89.8496, 14.093 ] ] ] }, "pyname" : "sx", "boxtype" : "inter", "date" : "2012/6/5 12:41:42" }

可以看到名称为geo的这个Field，里边存的就是矢量要素的坐标信息

空间查询与空间索引

可用的空间操作包括geointersect,geowithin,near等，参考http://docs.mongodb.org/manual/reference/operator/query-geospatial/
这里使用geointersect为例说明一下：

[csharp] view plaincopyprint 01.//获取Collection
02. MongoDatabase db = server.GetDatabase("aa");
03. MongoCollection colSheng = db.GetCollection("sheng");
04.
05. //定义一个查询框或查询多边形
06. var poly = GeoJson.Polygon(
07. GeoJson.Position(100, 20),
08. GeoJson.Position(110, 20),
09. GeoJson.Position(110, 40),
10. GeoJson.Position(100, 40),
11. GeoJson.Position(100, 20));
12. //以这个查询多边形为条件定义一条查询语句
13. var queryFilter2 = Query.GeoIntersects("geo", poly);
14. //进行查询，输出MongoCursor
15. cur = colSheng.FindAs(queryFilter2).SetFields( "pyname", "date");
16. //获取结果
17. var res = cur.ToArray();
18. for (int i = 0; i < res.Count(); i++)
19. {
20. BsonDocument tmpDoc = res.ElementAt(i);
21. //do something you want
22. }
//获取Collection
MongoDatabase db = server.GetDatabase("aa");
MongoCollection colSheng = db.GetCollection("sheng");

//定义一个查询框或查询多边形
var poly = GeoJson.Polygon(
GeoJson.Position(100, 20),
GeoJson.Position(110, 20),
GeoJson.Position(110, 40),
GeoJson.Position(100, 40),
GeoJson.Position(100, 20));
//以这个查询多边形为条件定义一条查询语句
var queryFilter2 = Query.GeoIntersects("geo", poly);
//进行查询，输出MongoCursor
cur = colSheng.FindAs(queryFilter2).SetFields( "pyname", "date");
//获取结果
var res = cur.ToArray();
for (int i = 0; i < res.Count(); i++)
{
BsonDocument tmpDoc = res.ElementAt(i);
//do something you want
}

关于空间索引，可参考http://docs.mongodb.org/manual/applications/geospatial-indexes/
这里不详细说了

空间查询运算的问题：