JavaScript中将十进制度数转换为度分秒

Question

JavaScript中将十进制度数转换为度分秒

17

我正在尝试编写一个函数，将我的十进制度数（纬度或经度）转换为DMS度分秒。我知道我应该把小数点后的数字乘以60，然后再次得到一个小数。但是我是个新手。我应该将这个数字拆分吗？

function ConvertDDToDMS(DD) {
    eg. DD =-42.4
    D= 42;
    M= 4*60;
    S= .M * 60;
    var DMS =

    return DMS //append Direction (N, S, E, W);
}

我走得正确吗？

- Christopher

作业任务？提示：使用 Math.floor。 - Austin Taylor

被接受的答案的Javascript实现对于负值无效。 - Jaco Briers

1

更好的答案：https://dev59.com/WloU5IYBdhLWcg3wCjvx#37893239 - devuxer

12个回答

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- Chris Chukwuemeka · Answer 1

好的答案在这里，但要以标准格式获取DMS。

function padZero(num, targetLength) {
  return String(num).padStart(targetLength, "0");
}

function ddToDms(deg, latOrlon) {
  var absolute = Math.abs(deg);
  var degrees = Math.floor(absolute);
  var minNt = (absolute - degrees) * 60;
  var minutes = Math.floor(minNt);
  var seconds = ((minNt - minutes) * 60).toFixed(2);
  var secs = Math.floor(seconds);

  // Get cardinal direction
  if (latOrlon == "lat") {
    var direction = deg >= 0 ? "N" : "S";
  } else if (latOrlon == "lon") {
    var direction = deg >= 0 ? "E" : "W";
  }

  // Ensure 60 minutes add 1 to degree and 60 seconds add 1 to minutes
  if (seconds == 60) {
    minutes++;
    seconds = 0;
  }
  if (minutes == 60) {
    degrees++;
    minutes = 0;
  }

  // Pad with zero
  if (
    (degrees < 10 && latOrlon == "lat") ||
    (degrees > 10 && degrees < 100 && latOrlon == "lon")
  ) {
    var degrees = padZero(degrees, String(degrees).length + 1);
  } else if (degrees < 10 && latOrlon == "lon") {
    var degrees = padZero(degrees, String(degrees).length + 2);
  }
  if (minutes < 10) {
    var minutes = padZero(minutes, String(minutes).length + 1);
  }
  if (secs < 10) {
    var seconds = padZero(seconds, String(seconds).length + 1);
  }

  // Validate lat and lon
  if (deg > 90 && latOrlon == "lat") {
    alert("LATITUDE CANNOT BE MORE THAN 90");
  } else if (deg > 180 && latOrlon == "lon") {
    alert("LONGITUDE CANNOT BE MORE THAN 180");
  } else {
    return degrees + "°" + minutes + "'" + seconds + '"' + direction;
  }
}

// Example
var lat = 9.129438;
var lon = -4.233587;

var latDMS = ddToDms(lat, 'lat'); 
var lonDMS = ddToDms(lon, 'lon');

console.log('latDMS: '+ latDMS);
console.log('lonDMS: '+ lonDMS);

/*
Output
latDMS: 09°07'45.98"N
lonDMS: 004°14'00.91"W
*/

- archi pelago · Answer 2

仅供参考，答案如下

function ConvertDDToDMS(D){
return [0|D, 'd ', 0|(D<0?D=-D:D)%1*60, "' ", 0|D*60%1*60, '"'].join('');

}

在-1°和0°之间的角度无法工作。真不走运！ hc