php 讀取 google 地圖經緯度

參考了網上部分資料，自己改寫了一個方便的擷取經緯度資訊的類Geo，其中Latitude和Longtitude分別是緯度和經度。其中最重要的建構函式就是傳入地名，通過Webrequest從Google Map獲得經緯度值，在含有地理位置資訊的項目裡可以很方便的調用，即Geo g = new Geo("北京師範大學");然後g.Latitude和g.Longtitude就是北京師範大學的緯度和經度了，它們分別是39.9614580，116.3692820。Geo的實現如下：

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;

namespace YourNameSpace
{
    /// <summary>
    /// a class for latitude and longtitude
    /// </summary>
    [Serializable]
    public class Geo
    {
        /// <summary>
        /// latitude
        /// </summary>
        private string _latitude = "";

        /// <summary>
        /// longtitude
        /// </summary>
        private string _longtitude = "";

        /// <summary>
        /// default constructor
        /// </summary>
        public Geo()
        {

        }

        /// <summary>
        /// construct geo given latitude and longtitude
        /// </summary>
        /// <param name="latitude"></param>
        /// <param name="longtitude"></param>
        public Geo(string latitude, string longtitude)
        {
            _latitude = latitude;
            _longtitude = longtitude;
        }
       
        /// <summary>
        /// construct geo given name of a place
        /// </summary>
        /// <param name="location"></param>
        public Geo(string location)
        {
            string output = "csv";
            string url = string.Format("ps教程.google.com/maps/geo?q={0}&output={1">http://maps.google.com/maps/geo?q={0}&output={1}", location, output);
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            HttpWebResponse response = (HttpWebResponse)request.GetResponse();
            using (StreamReader sr = new StreamReader(response.GetResponseStream()))
            {
                string[] tmpArray = sr.ReadToEnd().Split(',');
                _latitude = tmpArray[2];
                _longtitude = tmpArray[3];
            }
        }

        /// <summary>
        /// get latitude(緯度)
        /// </summary>
        public string Latitude
        {
            get { return _latitude; }
            set { _latitude = value; }
        }

        /// <summary>
        /// get longtitude(經度)
        /// </summary>
        public string Longtitude
        {
            get { return _longtitude; }
            set { _longtitude = value; }
        }
    }