例如,给定以下图像,poly1和poly2应该具有交点,而poly3不具有交叉.

我们假设poly1具有以下坐标和以下JSON：

{ 
  "_id" : ObjectId("57ab2107505ab11b1bd8422e"),"name" : "poly1","updated_at" : ISODate("2016-08-10T12:41:43.789+0000"),"created_at" : ISODate("2016-08-10T12:41:43.780+0000"),"geo" : {
      "coordinates" : [ [14.59,24.847],[28.477,15.961] ],"type" : "LineString"
  },"__v" : NumberInt(0)
}

当我在MongoChef上运行查询时,我发现poly1和poly2都不像我想要的那样找到poly3：

{
    geo :{
        $geoIntersects:{
            $geometry :{
                type: "LineString",coordinates: [ [14.59,15.961] ]
            }
        }
    }
}

而当我运行Mongoose查询给定Polyline Id /名称它不工作

//Given
var linestringById = Linestrings.find({name : lineName});
var linestrings    = Linestrings.find({});    

//Works
query = linestrings.where({ geo : { $geoIntersects : 
                    { $geometry : 
                       { type : 'LineString',coordinates : [ [27.528,25.006],[14.063,15.591] ]
                        } 
                     } } });

//Does not work
query = linestrings.where({ geo : { $geoIntersects : 
                   { $geometry : 
                     { type : 'LineString',coordinates : linestringById.geo.coordinates
                     } 
                    } } });
//Also does not work:
query = linestrings.where({ geo : { $geoIntersects : 
                   { $geometry : 
                     { type : 'LineString',coordinates : linestringById
                     } 
                    } } });

这是LineStrings的Schema：

var mongoose = require('mongoose');
var Schema   = mongoose.Schema;

// Creates a LineString Schema.
var linestrings = new Schema({
    name: {type: String,required : true},geo : {
        type : {type: String,default: "LineString"},coordinates : Array
    },created_at: {type: Date,default: Date.now},updated_at: {type: Date,default: Date.now}
});

// Sets the created_at parameter equal to the current time
linestrings.pre('save',function(next){
    now = new Date();
    this.updated_at = now;
    if(!this.created_at) {
        this.created_at = now
    }
    next();
});

linestrings.index({geo : '2dsphere'});
module.exports = mongoose.model('linestrings',linestrings);

这是我如何从前端QueryController.js调用查询

/** Looks for LineStrings intersecting a given linestring **/
vm.polyIntersect = function () {

   //Taking name from a form
   vm.queryBody = {
                    name : vm.formData.poly1
   };

   // Post the queryBody 
   $http.post('/find-poly-intersection',vm.queryBody)
             .success(function(queryResults) {
                console.log(queryResults);
             })
            .error(function(queryResults) {
                console.log('Error: no results found '+queryResults));
            });
};

这是我的Route.js：

/** Requiring Factories **/
var LinestringFactory = require('./factories/linestring.factory.js');

module.exports = function(app) {
  // Retrieves JSON records for all linestrings intersecting a given one
    app.post('/find-poly-intersection',function(req,res) {
        LinestringFactory.findIntersections(req).then( function (linestrings) {
            return res.json(linestrings);
        },function (error) {
            return res.json(error);
        })
    });
}

这是我的LineString.factory.js：

var Linestrings  = require('../models/linestring-model.js');

exports.findIntersections = findIntersections;

/** Finds Linestrings Intersections **/
function findIntersections(req) {
    return new Promise( function (resolve,reject) {
        var lineName       = req.body.name;
        var linestringById = Linestrings.find({name : lineName});
        var linestrings    = Linestrings.find({});

        //Check if that certain linestring exists with Lodash
        if (_.isEmpty(linestringById) || _.isUndefined(linestringById) 
            || _.isNull(linestringById)){
            return reject('No Linestrings found for that Name');
        } else {

        query = linestrings.where({ geo : 
                { $geoIntersects : { $geometry : 
                  { type : 'LineString',coordinates : linestringById.geo.coordinates} 
                } } });

        query.exec(function (err,intersections) {
            if (err){
                return reject(err);
            }
            return resolve(intersections);
        });

    },function (error) {
        return reject(error);
    })
}

console.log in QueryController gives me always Object {} for any
linestring name.

07001.

I’m making sure of inserting [lng,lat] coordinates

你有什么想法,为什么我找不到任何LineString与Id相交,而我可以使用直线坐标找到它们？

提前致谢.