$geometry

The $geometry operator specifies a GeoJSON geometry for use with the following geospatial query operators: $geoWithin, $geoIntersects, $near, and $nearSphere. $geometry运算符指定了一个GeoJSON几何体，用于以下地理空间查询运算符：$geoWithin、$geoIntersects、$near和$nearSphere。$geometry uses EPSG:4326 as the default coordinate reference system (CRS).$geometry使用EPSG:4326作为默认坐标参考系（CRS）。

To specify GeoJSON objects with the default CRS, use the following prototype for $geometry:要使用默认CRS指定GeoJSON对象，请对$geometry使用以下原型：

$geometry: {
   type: "<GeoJSON object type>",
   coordinates: [ <coordinates> ]
}

To specify a single-ringed GeoJSON polygon with a custom MongoDB CRS, use the following prototype (available only for $geoWithin and $geoIntersects):要使用自定义MongoDB CRS指定一个单环GeoJSON多边形，请使用以下原型（仅适用于$geoWithin和$geoIntersects）：

$geometry: {
   type: "Polygon",
   coordinates: [ <coordinates> ],
   crs: {
      type: "name",
      properties: { name: "urn:x-mongodb:crs:strictwinding:EPSG:4326" }
   }
}

The custom MongoDB coordinate reference system has a strict counter-clockwise winding order.自定义MongoDB坐标参考系具有严格的逆时针缠绕顺序。