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# \$1geoIntersects
<a name="geoIntersects"></a>

Amazon DocumentDB 中的`$geoIntersects`运算符用于查找其地理空间数据与指定 GeoJSON 对象相交的文档。对于需要根据文档与给定地理形状（例如多边形或多面）的空间关系来识别文档的应用程序，此运算符非常有用。

**参数**
+ `$geometry`: 一个 GeoJSON 对象，它表示要检查交叉点的形状。支持的 GeoJSON 对象类型有`Point`、`LineString``Polygon`、和。`MultiPolygon`

## 示例（MongoDB 外壳）
<a name="geoIntersects-examples"></a>

以下示例演示如何使用`$geoIntersects`运算符在 Amazon DocumentDB 中查找一组给定坐标的状态名称。

**创建示例文档**

```
db.states.insertMany([
  {
    "name": "New York",
    "loc": {
      "type": "Polygon",
      "coordinates": [[
        [-74.25909423828125, 40.47556838210948],
        [-73.70819091796875, 40.47556838210948],
        [-73.70819091796875, 41.31342607582222],
        [-74.25909423828125, 41.31342607582222],
        [-74.25909423828125, 40.47556838210948]
      ]]
    }
  },
  {
    "name": "California",
    "loc": {
      "type": "Polygon",
      "coordinates": [[
        [-124.4091796875, 32.56456771381587],
        [-114.5458984375, 32.56456771381587],
        [-114.5458984375, 42.00964153424558],
        [-124.4091796875, 42.00964153424558],
        [-124.4091796875, 32.56456771381587]
      ]]
    }
  }
]);
```

**查询示例**

```
var location = [-73.965355, 40.782865];

db.states.find({
  "loc": {
    "$geoIntersects": {
      "$geometry": {
        "type": "Point",
        "coordinates": location
      }
    }
  }
}, {
  "name": 1
});
```

**输出**

```
{ "_id" : ObjectId("536b0a143004b15885c91a2c"), "name" : "New York" }
```

## 代码示例
<a name="geoIntersects-code"></a>

要查看使用该`$geoIntersects`命令的代码示例，请选择要使用的语言的选项卡：

------
#### [ Node.js ]

```
const { MongoClient } = require('mongodb');

async function findStateByGeoIntersects(longitude, latitude) {
  const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
  const db = client.db('test');
  const collection = db.collection('states');

  const query = {
    loc: {
      $geoIntersects: {
        $geometry: {
          type: 'Point',
          coordinates: [longitude, latitude]
        }
      }
    }
  };

  const projection = {
    _id: 0,
    name: 1
  };

  const document = await collection.findOne(query, { projection });

  await client.close();
  
  if (document) {
    return document.name;
  } else {
    throw new Error('The geo location you entered was not found in the United States!');
  }
}
```

------
#### [ Python ]

```
from pymongo import MongoClient

def find_state_by_geointersects(longitude, latitude):
    try:
        client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
        db = client.test
        collection_states = db.states

        query_geointersects = {
            "loc": {
                "$geoIntersects": {
                    "$geometry": {
                        "type": "Point",
                        "coordinates": [longitude, latitude]
                    }
                }
            }
        }

        document = collection_states.find_one(query_geointersects,
                                              projection={
                                                  "_id": 0,
                                                  "name": 1
                                              })
        if document is not None:
            state_name = document['name']
            return state_name
        else:
            raise Exception("The geo location you entered was not found in the United States!")
    except Exception as e:
        print('Exception in geoIntersects: {}'.format(e))
        raise
    finally:
        if client is not None:
            client.close()
```

------