2013-0605
使用百度提供纠正接口对定位经度纬度纠正
分类: 编程开发
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摘要：通过GPS或者北斗定位坐标和中国国内地图坐标有偏移，纠正方法
通过GPS或者北斗定位坐标和中国国内地图坐标有偏移，纠正方法如下：11
/// <summary>
/// 百度地图纠正偏移
/// </summary>
/// <param name="requestModel"></param>
/// <returns></returns>
private RequestModel GetRealyLanANdLat(RequestModel requestModel)
{
string url = "http://api.map.baidu.com/ag/coord/convert?from=2&to=4&x="+requestModel.Location_X+"&y="+requestModel.Location_Y+"";
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
System.IO.Stream responseStream = response.GetResponseStream();
System.IO.StreamReader sr = new System.IO.StreamReader(responseStream, System.Text.Encoding.GetEncoding("utf-8"));
string responseText = sr.ReadToEnd();
sr.Close();
sr.Dispose();
responseStream.Close();
string jsonData = responseText;
JavaScriptSerializer jss = new JavaScriptSerializer();
ConvertLanAndLatWithBaiduModel convertLanAndLatWithBaidu = jss.Deserialize<ConvertLanAndLatWithBaiduModel>(jsonData);
requestModel .Location_X= System.Text.Encoding.Default.GetString(Convert.FromBase64String(convertLanAndLatWithBaidu.X));
requestModel.Location_Y = System.Text.Encoding.Default.GetString(Convert.FromBase64String(convertLanAndLatWithBaidu.Y));
return requestModel;
}说明，上述方法使用百度提供的纠正方法，获取纠正坐标后做Base64解码获得真实经纬度。
以下是反系列化Model：
[Serializable]
public class ConvertLanAndLatWithBaiduModel
{
public int Error { get; set; }
public string X { get; set; }
public string Y { get; set; }
}
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