# 地理边界聚合(Geo Bounds Aggregation)

地理边界聚合是一个度量聚合，为一个字段计算包含所有地点值的边界框。

例如：

```
{
    "query" : {
        "match" : { "business_type" : "shop" }
    },
    "aggs" : {
        "viewport" : {
            "geo_bounds" : {
                "field" : "location",  # 1
                "wrap_longitude" : true   # 2
            } 
        } 
    } 
}
```

| 1 | 地理边界聚合指定一个字段用来获得边界。                                  |
| - | ---------------------------------------------------- |
| 2 | wrap\_longitude是一个可选参数，指定边界框是否允许与国际日期变更线重叠，默认值是true。 |

上面的聚合实例表示查询所有业务类型为商店的文档，并且根据文档中的位置字段计算出边界框。

上面聚合语句的返回值为：

```
{
    ...

    "aggregations": {
        "viewport": {
            "bounds": {
                "top_left": {
                    "lat": 80.45,
                    "lon": -160.22
                },
                "bottom_right": {
                    "lat": 40.65,
                    "lon": 42.57
                }
            }
        }
    }
}
```


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