Node.js MongoDB/Mongoose geoNear返回的距离不正确
当我尝试使用geoNear()方法查找具有定义的地理坐标的文档时,MongoDB的距离计算似乎处于关闭状态,导致结果数组为空 我的位置收藏中有以下文档:Node.js MongoDB/Mongoose geoNear返回的距离不正确,node.js,mongodb,mongoose,distance,Node.js,Mongodb,Mongoose,Distance,当我尝试使用geoNear()方法查找具有定义的地理坐标的文档时,MongoDB的距离计算似乎处于关闭状态,导致结果数组为空 我的位置收藏中有以下文档: { "_id" : ObjectId("56e4791244ea3215c8537425"), "name" : "Cool Place", "address" : "224 West 71th Street, New York, NY 10023", "rating" : 5, "facilities"
{
"_id" : ObjectId("56e4791244ea3215c8537425"),
"name" : "Cool Place",
"address" : "224 West 71th Street, New York, NY 10023",
"rating" : 5,
"facilities" : [...etc...],
"coords" : [
-73.983342,
40.778183
],
"openingTimes" : [...etc...],
"reviews" : [...etc...]
}
我的模式如下所示:
var locationSchema = new mongoose.Schema({
name: {
type: String,
required: true
},
address: String,
rating: {
type: Number,
'default': 0,
min: 0,
max: 5
},
facilities: [String],
coords: {
type: [Number],
index: '2dsphere'
},
openingTimes: [openingTimeSchema],
reviews: [reviewSchema]
});
var theEarth = (function () {
var earthRadius = 6371; // km, miles is 3959
var getDistanceFromRads = function (rads) {
return parseFloat(rads * earthRadius);
};
var getRadsFromDistance = function (distance) {
return parseFloat(distance / earthRadius);
};
return {
getDistanceFromRads: getDistanceFromRads,
getRadsFromDistance: getRadsFromDistance
};
})();
var buildResultsList = function (results) {
var resultsList = [];
results.forEach(function (doc) {
resultsList.push({
distance: theEarth.getDistanceFromRads(doc.dis),
name: doc.obj.name,
address: doc.obj.address,
rating: doc.obj.rating,
facilities: doc.obj.facilities,
coords: doc.obj.coords,
_id: doc.obj._id
});
});
return resultsList;
};
module.exports.locationsListByDistance = function (req, res) {
var lng = parseFloat(req.query.lng);
var lat = parseFloat(req.query.lat);
var maxDistance = parseFloat(req.query.maxDistance);
var point = {
type: 'Point',
coordinates: [lng, lat]
};
var geoOptions = {
spherical: true,
maxDistance: theEarth.getRadsFromDistance(maxDistance),
num: 10
};
Loc.geoNear(point, geoOptions, function (err, results, stats) {
sendJsonResponse(res, 200, buildResultsList(results));
});
};
控制器的相关部分如下所示:
var locationSchema = new mongoose.Schema({
name: {
type: String,
required: true
},
address: String,
rating: {
type: Number,
'default': 0,
min: 0,
max: 5
},
facilities: [String],
coords: {
type: [Number],
index: '2dsphere'
},
openingTimes: [openingTimeSchema],
reviews: [reviewSchema]
});
var theEarth = (function () {
var earthRadius = 6371; // km, miles is 3959
var getDistanceFromRads = function (rads) {
return parseFloat(rads * earthRadius);
};
var getRadsFromDistance = function (distance) {
return parseFloat(distance / earthRadius);
};
return {
getDistanceFromRads: getDistanceFromRads,
getRadsFromDistance: getRadsFromDistance
};
})();
var buildResultsList = function (results) {
var resultsList = [];
results.forEach(function (doc) {
resultsList.push({
distance: theEarth.getDistanceFromRads(doc.dis),
name: doc.obj.name,
address: doc.obj.address,
rating: doc.obj.rating,
facilities: doc.obj.facilities,
coords: doc.obj.coords,
_id: doc.obj._id
});
});
return resultsList;
};
module.exports.locationsListByDistance = function (req, res) {
var lng = parseFloat(req.query.lng);
var lat = parseFloat(req.query.lat);
var maxDistance = parseFloat(req.query.maxDistance);
var point = {
type: 'Point',
coordinates: [lng, lat]
};
var geoOptions = {
spherical: true,
maxDistance: theEarth.getRadsFromDistance(maxDistance),
num: 10
};
Loc.geoNear(point, geoOptions, function (err, results, stats) {
sendJsonResponse(res, 200, buildResultsList(results));
});
};
最后,这是我提出的要求:
http://localhost:3000/api/locations?lng=-73.9827568&lat=40.7791425&maxDistance=10
然而,我只得到一个空的结果数组,即使位置在我在请求中指定的坐标10公里以内。如果我将maxDistance
query参数更改为100000,则返回结果,显示距离为749557.1657218104 km:
[{"distance":749557.1657218104,"name":"Cool Place","address":"224 West 71th Street, New York, NY 10023","rating":5,"facilities":["Hot drinks","Premium wifi"],"coords":[-73.983342,40.778183],"_id":"56e4791244ea3215c8537425"}]
我曾经计算过这两组坐标之间的距离,发现它们之间的距离只有0.1175公里
另一个注意事项:如果在查询中使用与位置(-73.983342,40.778183)关联的精确坐标,则返回位置,正确距离为0 km
成功请求:
http://localhost:3000/api/locations?lng=-73.983342&lat=40.778183&maxDistance=10
返回:
[{"distance":0,"name":"Cool Place","address":"224 West 71th Street, New York, NY 10023","rating":5,"facilities":["Hot drinks","Premium wifi"],"_id":"56e4791244ea3215c8537425"}]
知道我做错了什么吗?谢谢大家! 你使用什么版本的猫鼬?尝试使用“mongoose”:“~3.8.20”并更新npm包,然后重试