gps坐标转换 

 1 public string DM2DD(string DegreeMinutes)
 2   {
 3   //转换NMEA协议的“度分”格式为十进制“度度”格式
 4   string sDegree;
 5   string sMinute;
 6   string sReturn = "";
 7   if (DegreeMinutes.IndexOf(".") == 4)
 8   {
 9   //DegreeMinutes = Replace(DegreeMinutes, ".", "")
10 //DM2DD = CDbl(Left(DegreeMinutes, 2)) + CDbl(Left(CStr(CDbl(Right(DegreeMinutes, Len(DegreeMinutes) - 2)) / 60), 8)) / 10000
11   DegreeMinutes = DegreeMinutes.Replace(".", "");
12   double sDegree1 = Convert.ToDouble(DegreeMinutes.Substring(0, 2));
13   double sDegree2 = Convert.ToDouble(DegreeMinutes.Substring(2, DegreeMinutes.Length - 2));
14   string sTmp = Convert.ToString(sDegree2 / 60);
15   sDegree2 = Convert.ToDouble(sTmp.Substring(0, sTmp.Length));
16   sDegree2 = sDegree2 / 10000;
17   sDegree = Convert.ToString(sDegree1 + sDegree2);
18   if (sDegree.Length > 11)
19   sDegree = sDegree.Substring(0, 11);
20   sReturn = sDegree;
21   }
22   else if (DegreeMinutes.IndexOf(".") == 5)
23   {
24   try
25   {
26   //DegreeMinutes = Replace(DegreeMinutes, ".", "")
27 //DM2DD = CDbl(Left(DegreeMinutes, 2)) + CDbl(Left(CStr(CDbl(Right(DegreeMinutes, Len(DegreeMinutes) - 2)) / 60), 8)) / 10000
28   DegreeMinutes = DegreeMinutes.Replace(".", "");
29   double sMinute1 = Convert.ToDouble(DegreeMinutes.Substring(0, 3));
30   double sMinute2 = Convert.ToDouble(DegreeMinutes.Substring(3, DegreeMinutes.Length - 3));
31   string sTmp = Convert.ToString(sMinute2 / 60);
32   sMinute2 = Convert.ToDouble(sTmp.Substring(0, sTmp.Length));
33   sMinute2 = sMinute2 / 10000;
34   sMinute = Convert.ToString(sMinute1 + sMinute2);
35   if (sMinute.Length > 10)
36   sMinute = sMinute.Substring(0, 10);
37   sReturn = sMinute;
38   }
39   catch (Exception ex)
40   {
41   ex.ToString();
42   }
43   }
44   return sReturn;
45   }

 

posted @ 2011-12-06 21:38  牛德彪  阅读(358)  评论(0)    收藏  举报