$centerSphere

该 $centerSphere 运算符使用球形几何图形为 $geoWithin 查询指定圆圈。 此运算符适用于需要考虑地球球形的地理计算。

语法

{
  $geoWithin: {
    $centerSphere: [ [ <x>, <y> ], <radius in radians> ]
  }
}

参数

例子

请考虑商店集合中的这个示例文档。

{
    "_id": "0fcc0bf0-ed18-4ab8-b558-9848e18058f4",
    "name": "First Up Consultants | Beverage Shop - Satterfieldmouth",
    "location": {
        "lat": -89.2384,
        "lon": -46.4012
    },
    "staff": {
        "totalStaff": {
            "fullTime": 8,
            "partTime": 20
        }
    },
    "sales": {
        "totalSales": 75670,
        "salesByCategory": [
            {
                "categoryName": "Wine Accessories",
                "totalSales": 34440
            },
            {
                "categoryName": "Bitters",
                "totalSales": 39496
            },
            {
                "categoryName": "Rum",
                "totalSales": 1734
            }
        ]
    },
    "promotionEvents": [
        {
            "eventName": "Unbeatable Bargain Bash",
            "promotionalDates": {
                "startDate": {
                    "Year": 2024,
                    "Month": 6,
                    "Day": 23
                },
                "endDate": {
                    "Year": 2024,
                    "Month": 7,
                    "Day": 2
                }
            },
            "discounts": [
                {
                    "categoryName": "Whiskey",
                    "discountPercentage": 7
                },
                {
                    "categoryName": "Bitters",
                    "discountPercentage": 15
                },
                {
                    "categoryName": "Brandy",
                    "discountPercentage": 8
                },
                {
                    "categoryName": "Sports Drinks",
                    "discountPercentage": 22
                },
                {
                    "categoryName": "Vodka",
                    "discountPercentage": 19
                }
            ]
        },
        {
            "eventName": "Steal of a Deal Days",
            "promotionalDates": {
                "startDate": {
                    "Year": 2024,
                    "Month": 9,
                    "Day": 21
                },
                "endDate": {
                    "Year": 2024,
                    "Month": 9,
                    "Day": 29
                }
            },
            "discounts": [
                {
                    "categoryName": "Organic Wine",
                    "discountPercentage": 19
                },
                {
                    "categoryName": "White Wine",
                    "discountPercentage": 20
                },
                {
                    "categoryName": "Sparkling Wine",
                    "discountPercentage": 19
                },
                {
                    "categoryName": "Whiskey",
                    "discountPercentage": 17
                },
                {
                    "categoryName": "Vodka",
                    "discountPercentage": 23
                }
            ]
        }
    ]
}

示例 1：查找圆形区域内的存储（地球球形计算）

示例查询在 Wide World Importers Headphone Corner 商店位置的大约 1,000 公里（半径≈ 0.157 弧度）内查找两个商店。 该查询可以帮助确定附近商店的区域市场营销活动或供应链优化。

// Convert 1000km to radians: 1000/6371 ≈ 0.157
db.stores.find(
  {
    location: {
      $geoWithin: {
        $centerSphere: [[-82.5543, -65.105], 0.157]
      }
    }
  },
  {
    _id: 0,
    name: 1,
    location: 1,
    city: 1
  }
).limit(2)

此查询返回的前两个结果为：

[
  {
    "name": "Fourth Coffee | Electronics Bazaar - O'Keefeburgh",
    "location": { "lat": -64.5856, "lon": -115.5241 },
    "city": "O'Keefeburgh"
  },
  {
    "name": "Boulder Innovations | Footwear Outlet - West Sybleberg",
    "location": { "lat": -72.73, "lon": -60.2306 },
    "city": "West Sybleberg"
  }
]

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