double coord = 59.345235;
int sec = (int)Math.Round(coord * 3600);
int deg = sec / 3600;
sec = Math.Abs(sec % 3600);
int min = sec / 60;
sec %= 60;
如何将度/分/秒转换回十进制坐标？
试一下这个：
public double ConvertDegreeAngleToDouble( double degrees, double minutes, double seconds )
{
//Decimal degrees =
// whole number of degrees,
// plus minutes divided by 60,
// plus seconds divided by 3600
return degrees + (minutes/60) + (seconds/3600);
}
仅为了节省其他人的时间，我想补充一下Byron的答案。如果您有字符串形式的点（例如“17.21.18S”），可以使用此方法：
public double ConvertDegreeAngleToDouble(string point)
{
//Example: 17.21.18S
var multiplier = (point.Contains("S") || point.Contains("W")) ? -1 : 1; //handle south and west
point = Regex.Replace(point, "[^0-9.]", ""); //remove the characters
var pointArray = point.Split('.'); //split the string.
//Decimal degrees =
// whole number of degrees,
// plus minutes divided by 60,
// plus seconds divided by 3600
var degrees = Double.Parse(pointArray[0]);
var minutes = Double.Parse(pointArray[1]) / 60;
var seconds = Double.Parse(pointArray[2]) / 3600;
return (degrees + minutes + seconds) * multiplier;
}
由于每个度数总共值1个坐标，每个分钟值1/60个坐标，每个秒钟值1/3600个坐标，您应该能够使用以下方法将它们重新组合：
new_coord = deg + min/60 + sec/3600
请注意，由于浮点数舍入的原因，它不会与原始数据完全相同。
CoordinateSharp 是一个可用的 Nuget 包，它可以为您处理坐标转换。它甚至可以进行 UTM/MGRS 转换并提供相对于输入位置的太阳/月亮时间。它非常易于使用！
Coordinate c = new Coordinate(40.465, -75.089);
//Display DMS Format
c.FormatOptions.Format = CoordinateFormatType.Degree_Minutes_Seconds;
c.ToString();//N 40º 27' 54" W 75º 5' 20.4"
c.Latitude.ToString();//N 40º 27' 54"
c.Latitude.ToDouble();//40.465
坐标属性也是可观察的。因此，如果您更改了纬度分钟值，其他所有内容都会更新。
通常，西半球和南半球用负度数表示，秒数带有小数以增加精度：-86:44:52.892。请记住，经度是X坐标，纬度是Y坐标。由于人们经常将它们称为lat/lon和X/Y，因此这经常会混淆。我修改了以下代码来适应上述格式。
private double ConvertDegreesToDecimal(string coordinate)
{
double decimalCoordinate;
string[] coordinateArray = coordinate.Split(':');
if (3 == coordinateArray.Length)
{
double degrees = Double.Parse(coordinateArray[0]);
double minutes = Double.Parse(coordinateArray[1]) / 60;
double seconds = Double.Parse(coordinateArray[2]) / 3600;
if (degrees > 0)
{
decimalCoordinate = (degrees + minutes + seconds);
}
else
{
decimalCoordinate = (degrees - minutes - seconds);
}
}
return decimalCoordinate;
}
对于那些喜欢使用正则表达式并处理像DDMMSS.dddS这样的格式的人来说，这个函数可以很容易地更新以处理其他格式。
C#
Regex reg = new Regex(@"^((?<D>\d{1,2}(\.\d+)?)(?<W>[SN])|(?<D>\d{2})(?<M>\d{2}(\.\d+)?)(?<W>[SN])|(?<D>\d{2})(?<M>\d{2})(?<S>\d{2}(\.\d+)?)(?<W>[SN])|(?<D>\d{1,3}(\.\d+)?)(?<W>[WE])|(?<D>\d{3})(?<M>\d{2}(\.\d+)?)(?<W>[WE])|(?<D>\d{3})(?<M>\d{2})(?<S>\d{2}(\.\d+)?)(?<W>[WE]))$");
private double DMS2Decimal(string dms)
{
double result = double.NaN;
var match = reg.Match(dms);
if (match.Success)
{
var degrees = double.Parse("0" + match.Groups["D"]);
var minutes = double.Parse("0" + match.Groups["M"]);
var seconds = double.Parse("0" + match.Groups["S"]);
var direction = match.Groups["W"].ToString();
var dec = (Math.Abs(degrees) + minutes / 60d + seconds / 3600d) * (direction == "S" || direction == "W" ? -1 : 1);
var absDec = Math.Abs(dec);
if ((((direction == "W" || direction == "E") && degrees <= 180 & absDec <= 180) || (degrees <= 90 && absDec <= 90)) && minutes < 60 && seconds < 60)
{
result = dec;
}
}
return result;
}
public double ConvertDegreeAngleToDouble(double degrees, double minutes, double seconds)
{
var multiplier = (degrees < 0 ? -1 : 1);
var _deg = (double)Math.Abs(degrees);
var result = _deg + (minutes / 60) + (seconds / 3600);
return result * multiplier;
}
sec / 3600分配给deg不就相当于将coord分配给它吗？ - Jeff LaFay