将GPS坐标（经度和纬度）转换为十进制 [英] Converting GPS coordinates (latitude and longitude) to decimal

问题描述

我从GPS设备获取经度和纬度。他们看起来像21081686N，079030977E

如果我手动将它们转换为21°08'16.86N，79°03'09.77E并检查Google地图，几乎是正确的。

如何在java中将这些值转换并准确地将它们转换为十进制数？任何JAVA库？

谢谢，

解决方案

需要一个库，而只是将字符串分解成它们的组成部分。也许这会有所帮助。请注意我是不是的Java程序员，所以这个语法可能非常。 （也许你的问题重申Java）

小数点后，我认为你的意思是十进制度数而不是ddd.mmss

  //对于Lat / Lon对
公共类LatLonDecimal 
 {
 public float lat = 0.0; 
 public float lon = 0.0; 
} 
 
 //转换字符串例如21081686N，079030977Eto Lat / Lon pair 
 public LatLonDecimal MyClass :: convert（String latlon）
 {
 String [] parts = latlon.split（，）; 
 
 LatLonDecimal position = new LatLonDecimal（）; 
 position.lat = convertPart（parts [0]）; 
 position.lon = convertPart（parts [1]）; 
回报头寸; 
} 
 
 //转换子串例如（角度。长度（）<10）
角度=字符串缓冲器（角度）
（角度）21081686N到小数角度
私人浮动MyClass :: convertPart .insert（0，0）。toString（）; 
 
 int deg = Integer.parseInt（angle.substring（0,2））; 
 int min = Integer.parseInt（angle.substring（3,4））; 
 int sec = Integer.parseInt（angle.substring（5,6））; 
 int sub = Integer.parseInt（angle.substring（7,8））; 
 String hem = angle.substring（9）; 
 
浮点值= deg + min / 60.0f + sec / 3600.0f + sub / 360000.0f; 
 float sign =（hem ==S）？ -1.0：1.0; //负南半球纬度
返回符号*值; 
} 
  

I am getting the latitude and longitude from GPS device. They look like 21081686N,079030977E

If I manually convert them to 21°08'16.86"N, 79°03'09.77"E and check on Google maps, the location is almost correct.

How do I convert these values in java and convert them to decimal accurately? Any JAVA libraries?

Thanks,

解决方案

You shouldn't need a library, but rather just break up the strings into their component parts. Perhaps this will help. Please note I'm not a Java programmer so this syntax could very well be wrong. (Perhaps retag your question to Java)

By decimal I presume you mean decimal degrees and not ddd.mmss

// Object for Lat/Lon pair
public class LatLonDecimal
{
    public float lat = 0.0;
    public float lon = 0.0;
}

// Convert string e.g. "21081686N,079030977E" to Lat/Lon pair
public LatLonDecimal MyClass::convert(String latlon)
{
    String[] parts = latlon.split(",");

    LatLonDecimal position = new LatLonDecimal();
    position.lat = convertPart(parts[0]);
    position.lon = convertPart(parts[1]);
    return position;
}

// Convert substring e.g. "21081686N" to decimal angle
private float MyClass::convertPart(String angle)
{
    while (angle.length() < 10)
        angle = StringBuffer(angle).insert(0, "0").toString();

    int deg = Integer.parseInt( angle.substring(0,2) );
    int min = Integer.parseInt( angle.substring(3,4) );
    int sec = Integer.parseInt( angle.substring(5,6) );
    int sub = Integer.parseInt( angle.substring(7,8) );
    String hem = angle.substring(9);

    float value = deg + min / 60.0f + sec / 3600.0f + sub / 360000.0f;
    float sign = (hem == "S") ? -1.0 : 1.0; // negative southern hemisphere latitudes
    return sign * value;
}

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