我有下面存储在MongoDB 3.0.5中的文档
{
"_id" : ObjectId("55f3a6ae0907233b5e9e7da0"),
"user" : {
"id" : "2d5b093ec8a3",
"regions" : [
{
"id" : NumberLong(1442365443852),
"name" : "penta",
"type" : "Polygon",
"center" : {
"lat" : -12.1254159880008100,
"lng" : -77.0316830277442930
},
"zoom" : 17.0000000000000000,
"coordinates" : [
[
-77.0322804898023610,
-12.1271067552781560
],
[
-77.0336792618036270,
-12.1255133434450870
],
[
-77.0326449349522590,
-12.1239143495252150
],
[
-77.0300991833209990,
-12.1238251884504540
],
[
-77.0299865305423740,
-12.1262000752832540
],
[
-77.0322804898023610,
-12.1271067552781560
]
]
},
{
"id" : NumberLong(1442366496200),
"name" : "triangle",
"type" : "Polygon",
"center" : {
"lat" : -12.1254749913046230,
"lng" : -77.0316598936915400
},
"zoom" : 17.0000000000000000,
"coordinates" : [
[
-77.0313568040728570,
-12.1266573492018090
],
[
-77.0325788855552670,
-12.1246968022373030
],
[
-77.0300653204321860,
-12.1246233756874440
],
[
-77.0313568040728570,
-12.1266573492018090
]
]
}
]
}
}
表示存储为多边形的Google地图区域数组。我试图用几个替代方案查询它们但似乎没有工作,所以我想知道地理空间的MongoDB查询是否适用于数组。
我的Java代码是:DBCursor docs = getCollection()。find(search);
以下所有6个'搜索'查询在几何上都没有返回结果我希望匹配:
{“user.regions”:{“$ geoIntersects”:{“$ geometry”:{“type”:“Polygon”,“coordinates”:[[ - [77.02877718955278,-12.123750122669545],[ - 77.03457042574883,-12.123750122669545],[ - 77.03457042574883,-12.12736341792724],[ - 77.02877718955278,-12.12736341792724],[ - 77.02877718955278,-12.123750122669545]]]}}}}
{“user.regions.0”:{“$ geoIntersects”:{“$ geometry”:{“type”:“Polygon”,“coordinates”:[[ - [77.02877718955278,-12.123750122669545], [-77.03457042574883,-12.123750122669545],[ - 77.03457042574883,-12.12736341792724],[ - 77.02877718955278,-12.12736341792724],[ - 77.02877718955278,-12.123750122669545]]]}}}}
{“user.regions.0.center”:{“$ geoIntersects”:{“$ geometry”:{“type”:“Polygon”,“coordinates”:[[-77.02877718955278,-12.123750122669545 ],[ - 77.03457042574883,-12.123750122669545],[ - 77.03457042574883,-12.12736341792724],[ - 77.02877718955278,-12.12736341792724],[ - 77.02877718955278,-12.123750122669545]]]}}}}
{“user.regions”:{“$ geoWithin”:{“$ geometry”:{“type”:“Polygon”,“coordinates”:[[ - [77.02877718955278,-12.123750122669545],[ - 77.03457042574883,-12.123750122669545],[ - 77.03457042574883,-12.12736341792724],[ - 77.02877718955278,-12.12736341792724],[ - 77.02877718955278,-12.123750122669545]]]}}}}
{“user.regions.0”:{“$ geoWithin”:{“$ geometry”:{“type”:“Polygon”,“coordinates”:[[ - [77.02877718955278,-12.123750122669545], [-77.03457042574883,-12.123750122669545],[ - 77.03457042574883,-12.12736341792724],[ - 77.02877718955278,-12.12736341792724],[ - 77.02877718955278,-12.123750122669545]]]}}}}
{“user.regions.0.center”:{“$ geoWithin”:{“$ geometry”:{“type”:“Polygon”,“coordinates”:[[-77.02877718955278,-12.123750122669545 ],[ - 77.03457042574883,-12.123750122669545],[ - 77.03457042574883,-12.12736341792724],[ - 77.02877718955278,-12.12736341792724],[ - 77.02877718955278,-12.123750122669545]]]}}}}
我认为我尊重MongoDB中的long / lat顺序,我在我的多边形中重复关闭点,我添加了type =“Polygon”,在中心点的情况下它是在lat / lng params下面。但没有结果。
我没有创建任何索引,我认为我匹配params geoWithin(http://docs.mongodb.org/manual/reference/operator/query/geoWithin/)和geoIntercepts(http://docs.mongodb.org/manual/reference/operator/query/geoIntersects/)的语法
{
<location field>: {
$geoWithin: {
$geometry: {
type: <"Polygon" or "MultiPolygon"> ,
coordinates: [ <coordinates> ]
}
}
}
}
{
<location field>: {
$geoIntersects: {
$geometry: {
type: "<GeoJSON object type>" ,
coordinates: [ <coordinates> ]
}
}
}
}
关于“位置字段”,我按照此处http://docs.mongodb.org/manual/tutorial/query-documents/
所述的数组说明进行操作但是没有任何东西可以让查询获得任何结果。我搜索了相同的案例,我可以在2013年找到这个未解决的问题:How do I perform a find using $geoIntersects / 2dsphere in an array subfield?
所以,除非我犯了一个常见错误,否则我想知道是否有可能对数组参数进行地理空间查询?
有什么建议吗?
由于
答案 0 :(得分:2)
这是肯定的和没有问题要回答的问题之一,因为支持匹配结果的数组,但考虑到匹配方式的限制,它也可能不是你真正想要的。
这里需要进行的显着改变是,对象本身的定义方式不会像MongoDB那样在当前形成它们时识别它们。有两种索引和一般查找形式,可以是传统坐标对(只是一个x,y点),也可以是支持GeoJSON对象的GeoJSON。你的问题是你有一个“psuedo”GeoJSON格式,它并不真正符合规范,并且你试图直接访问“坐标”,你需要一个顶级对象,如下所示:
{
"regions": [
{
"name": "penta",
"geometry": {
"type": "Polygon",
"coordinates": [[
[
-77.0322804898023610,
-12.1271067552781560
],
[
-77.0336792618036270,
-12.1255133434450870
],
[
-77.0326449349522590,
-12.1239143495252150
],
[
-77.0300991833209990,
-12.1238251884504540
],
[
-77.0299865305423740,
-12.1262000752832540
],
[
-77.0322804898023610,
-12.1271067552781560
]
]]
}
},
{
"name": "triangle",
"geometry": {
"type": "Polygon",
"coordinates": [[
[
-77.0313568040728570,
-12.1266573492018090
],
[
-77.0325788855552670,
-12.1246968022373030
],
[
-77.0300653204321860,
-12.1246233756874440
],
[
-77.0313568040728570,
-12.1266573492018090
]
]]
}
}
]
}
因此,抽象GeoJSON部分既形成良好,又与其他不属于规范的元数据分开。理想情况下,您也可以编制索引,但$geoWithin
或$geoIntersects
不需要它,这肯定有帮助:
db.regions.createIndex({ "regions.geometry": "2dsphere" })
在数组元素中定义GeoJSON定义的完整路径。
然后查询正常工作:
db.regions.find({
"regions.geometry" : {
"$geoIntersects" : {
"$geometry" : {
"type" : "Polygon" ,
"coordinates" : [[
[ -77.02877718955278 , -12.123750122669545],
[ -77.03457042574883 , -12.123750122669545],
[ -77.03457042574883 , -12.12736341792724],
[ -77.02877718955278 , -12.12736341792724],
[ -77.02877718955278 , -12.123750122669545]
]]
}
}
}
})
与上述文件相符。但当然阵列中有多个对象,所以问题是,哪些匹配?由于MongoDB与“文档”匹配并且没有以任何方式指示哪个数组元素匹配,因此没有支持的答案。
聚合$geoNear
中有一个选项允许返回匹配的对象,在这种情况下它将是“最近的”。并且通过这样的细节,可以使用该信息来匹配具有完整元数据的数组元素包含为“最近”找到的元素并提取该数据。但同样它只是“接近”,并且也永远不会从数组中返回多个结果。
但一般来说,最好只将单独的对象作为自己集合中的文档,其中与不同对象的匹配只是匹配文档的问题。因此,对于它自己的集合中的上面的数组,您只需发出匹配几何的查询:
db.shapes.find({
"geometry" : {
"$geoIntersects" : {
"$geometry" : {
"type" : "Polygon" ,
"coordinates" : [ [
[ -77.02877718955278 , -12.123750122669545],
[ -77.03457042574883 , -12.123750122669545],
[ -77.03457042574883 , -12.12736341792724],
[ -77.02877718955278 , -12.12736341792724],
[ -77.02877718955278 , -12.123750122669545]
]]
}
}
}
})
这给出了正确的对象,因为在这种情况下,形状与两者相交:
{
"_id" : ObjectId("55f8d2fa66c2e7c750414b7a"),
"name" : "penta",
"geometry" : {
"type" : "Polygon",
"coordinates" : [[
[
-77.03228048980236,
-12.127106755278156
],
[
-77.03367926180363,
-12.125513343445087
],
[
-77.03264493495226,
-12.123914349525215
],
[
-77.030099183321,
-12.123825188450454
],
[
-77.02998653054237,
-12.126200075283254
],
[
-77.03228048980236,
-12.127106755278156
]
]]
}
}
{
"_id" : ObjectId("55f8d2fa66c2e7c750414b7b"),
"name" : "triangle",
"geometry" : {
"type" : "Polygon",
"coordinates" : [[
[
-77.03135680407286,
-12.126657349201809
],
[
-77.03257888555527,
-12.124696802237303
],
[
-77.03006532043219,
-12.124623375687444
],
[
-77.03135680407286,
-12.126657349201809
]
]]
}
}
所以你可以使用数组,但是你只能匹配文档而不是匹配中的各个数组成员,所以这将返回整个课程文档,你需要确定哪些成员符合标准在客户代码中。
另一方面,您的一些查询尝试试图将对象坐标数组“分解”为单个元素。这根本不受支持,因为对象只能作为一个整体处理,而不能作为“Point”部分处理。