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Convert latitude and longitude from degree decimal to degree, minutes, and seconds and vice versa. This JavaScript will also find the farthest point from the point entered, as well as the distance.

Label: Latitude-Longitude Converter

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<script type="text/javascript">
<!--
/*
Created by: Joe Ho */

function calc(Location) {
  // Retrieve the DD/DMS option
  for (var i=0;i<Location.inputType.length;i++) {
    if (Location.inputType[i].checked)
    {
      var inputed = Location.inputType[i].value;
    }
  }
  if (inputed == "DD")
  {
    // Retrieve Lat and Lon information
    var lat = Location.Latitude.value;
    var lon = Location.Longitude.value;
    if (lat==null)
    var lat=0;
    if (lon==null)
            var lon=0;

    // Check if any error occurred
    if (isNaN(Location.Latitude.value) || isNaN(Location.Longitude.value)) {
      alert("Latitude and Longitude must be numeric");
    } else if (lat < -90 || lat > 90 || lon < -180 || lon > 180) {
            alert("ERROR");
    } else {
      //Retrieve the latitude direction for Degrees Decimal
      for (var i=0;i<Location.LatDirect.length;i++) {
        if (Location.LatDirect[i].checked)
        {
          var LatDirect = Location.LatDirect[i].value;
        }
      }

      // If the user does not click direct button,
      // then a positive latitude value regards North, negative latitude value regards South
      if (LatDirect==null) {
        if (lat<0) {
          LatDirect = "S";
          Location.LatDirect[1].click();
        }
        else {
          LatDirect ="N";
          Location.LatDirect[0].click();
        }
      }

      // Retrieve the longitude direction for Deg/Min/Sec
      for (var i=0;i<Location.LonDirect.length;i++) {
        if (Location.LonDirect[i].checked)
        {
          var LonDirect = Location.LonDirect[i].value;
        }
      }

      // If the user does not click direct button,
      // then a positive latitude value regards East, negative latitude value regards West
      if (LonDirect==null) {
        if (lon<0) {
          LonDirect = "W";
          Location.LonDirect[1].click();
         }
        else {
          LonDirect ="E";
          Location.LonDirect[0].click();
        }
      }

      // Change to absolute value
      lat = Math.abs(lat);
      lon = Math.abs(lon);
      Location.Latitude.value=lat;
      Location.Longitude.value=lon;
      setAllEnabled(Location);

      // Convert to Degree Minutes Seconds Representation
      LatDeg = Math.floor(lat);
      LatMin = Math.floor((lat-LatDeg)*60);
      LatSec =  (Math.round((((lat - LatDeg) - (LatMin/60)) * 60 * 60) * 100) / 100 ) ;
      LonDeg = Math.floor(lon);
      LonMin = Math.floor((lon-LonDeg)*60);
      LonSec = (Math.round((((lon - LonDeg) - (LonMin / 60 )) * 60 * 60) * 100 ) / 100);

      // Copy result to the board
      Location.LatDeg.value=LatDeg;
      Location.LatMin.value=LatMin;
      Location.LatSec.value=LatSec;
      Location.LonDeg.value=LonDeg;
      Location.LonMin.value=LonMin;
      Location.LonSec.value=LonSec;
      if (LatDirect == "N") {
        Location.LatDMSDirect[0].click();
      } else {
        Location.LatDMSDirect[1].click();
      }
      if (LonDirect == "E") {
        Location.LonDMSDirect[0].click();
      } else {
        Location.LonDMSDirect[1].click();
      }
      clickedOption(Location);

      // Find the farthest Point Location
      farthestPoint(lat,lon,LatDeg,LonDeg,LatMin,LonMin,LatSec,LonSec,LatDirect,LonDirect);
    }
  } else if (inputed == "DMS") {

    // Retrieve Lat and Lon information
    var LatDeg = Location.LatDeg.value;
    var LatMin = Location.LatMin.value;
    var LatSec = Location.LatSec.value;
    var LonDeg = Location.LonDeg.value;
    var LonMin = Location.LonMin.value;
    var LonSec = Location.LonSec.value;

    // Assume the value to be zero if the user does not enter value
    if (LatDeg==null)
      LatDeg=0;
    if (LatMin==null) {
      LatMin=0;
    }
    if (LatSec==null) {
      LatSec=0;
    }
    if (LonDeg==null)
      LonDeg=0;
    if (LonMin==null) {
      LonMin=0
    }
    if (LonSec==null){
      LonSec=0;
    }

    // Check if any error occurred
    if (isNaN(Location.LatDeg.value) || isNaN(Location.LonDeg.value) || isNaN(Location.LatMin.value) || isNaN(Location.LonMin.value) || isNaN(Location.LatSec.value) || isNaN(Location.LonSec.value)) {
      alert("Latitude and Longitude must be numeric");
    } else if (LatDeg != Math.round(LatDeg) || LonDeg != Math.round(LonDeg) || LatMin != Math.round(LatMin) || LonMin != Math.round(LonMin)) {
      alert("ERROR");
    } else if (LatDeg < -90 || LatDeg > 90 || LonDeg < -180 || LonDeg > 180 || LatMin < -60 || LatMin > 60 || LonMin < -60 || LonMin > 60 || LatSec < -60 || LatSec > 60 || LonSec < -60 || LonSec > 60) {
      alert("ERROR");
    } else {
    // If no error, then go on

    // Retrieve the latitude direction for Degrees Decimal
    for (var i=0;i<Location.LatDMSDirect.length;i++) {
      if (Location.LatDMSDirect[i].checked)
      {
        var LatDMSDirect = Location.LatDMSDirect[i].value;
      }
    }

    // If the user does not click direct button,
    // then a postive latitude value regards North, negative latitude value regards South
    if (LatDMSDirect==null) {
      if (LatDeg<0 || Location.LatDeg.value=="-0") {
        LatDMSDirect = "S";
        Location.LatDMSDirect[1].click();
      }
      else {
        LatDMSDirect ="N";
        Location.LatDMSDirect[0].click();
      }
    }

    // Retrieve the longitude direction for Deg/Min/Sec
    for (var i=0;i<Location.LonDMSDirect.length;i++) {
      if (Location.LonDMSDirect[i].checked)
      {
        var LonDMSDirect = Location.LonDMSDirect[i].value;
      }
    }

    // If the user does not click direct button,
    // then a positive latitude value regards East, negative latitude value regards West
    if (LonDMSDirect==null) {
      if (LonDeg<0 || Location.LonDeg.value=="-0") {
        LonDMSDirect = "W";
        Location.LonDMSDirect[1].click();
      } else {
        LonDMSDirect ="E";
        Location.LonDMSDirect[0].click();
      }
    }

    // Change to absolute value
    LatDeg = Math.abs(LatDeg);
    LonDeg = Math.abs(LonDeg);
    LatMin = Math.abs(LatMin);
    LonMin = Math.abs(LonMin);
    LatSec = Math.abs(LatSec);
    LonSec = Math.abs(LonSec);
    setAllEnabled(Location);

    // Convert to Decimal Degrees Representation
    var lat = LatDeg + (LatMin/60) + (LatSec / 60 / 60);
    var lon = LonDeg + (LonMin/60) + (LonSec / 60 / 60);
    if ( lat <= 90 && lon <= 180 && lat >=0 && lon >= 0 )
    {
      // Copy the absolute value to the board
      Location.LatDeg.value=LatDeg;
      Location.LonDeg.value=LonDeg;
      Location.LatMin.value=LatMin;
      Location.LonMin.value=LonMin;
      Location.LatSec.value=LatSec;
      Location.LonSec.value=LonSec;

      // Rounding off
      lat = (Math.round(lat*1000000)/1000000);
      lon = (Math.round(lon*1000000)/1000000);

      // Copy result to the board
      Location.Latitude.value=lat;
      Location.Longitude.value=lon;
      if (LatDMSDirect == "N") {
        Location.LatDirect[0].click();
      } else {
        Location.LatDirect[1].click();
      }
      if (LonDMSDirect == "E") {
        Location.LonDirect[0].click();
      } else {
        Location.LonDirect[1].click();
      }
        clickedOption(Location);
        farthestPoint(lat,lon,LatDeg,LonDeg,LatMin,LonMin,LatSec,LonSec,LatDMSDirect,LonDMSDirect);
      } else
        alert("ERROR!!");
    }
  }
}

function clickedOption(Location) {
        // Retrieve The DD/DMS Option
        for (var i=0;i<Location.inputType.length;i++) {
                if (Location.inputType[i].checked)
                {
                        var inputed = Location.inputType[i].value;
                }
        }
        changeOption(Location,inputed);
}

function resetForm(Location) {
        changeOption(Location,"DD");
}

function changeOption(Location,inputed) {
  if (inputed=="DD") {
    with (Location) {
      LatDeg.disabled=true;
      LonDeg.disabled=true;
      LatMin.disabled=true;
      LonMin.disabled=true;
      LatSec.disabled=true;
      LonSec.disabled=true;
      Latitude.disabled=false;
      Longitude.disabled=false;
      LatDirect[0].disabled=false;
      LonDirect[0].disabled=false;
      LatDirect[1].disabled=false;
      LonDirect[1].disabled=false;
      LatDMSDirect[0].disabled=true;
      LonDMSDirect[0].disabled=true;
      LatDMSDirect[1].disabled=true;
      LonDMSDirect[1].disabled=true;
    }
  } else if (inputed =="DMS") {
    with (Location){
      Latitude.disabled=true;
      Longitude.disabled=true;
      LatDeg.disabled=false;
      LonDeg.disabled=false;
      LatMin.disabled=false;
      LonMin.disabled=false;
      LatSec.disabled=false;
      LonSec.disabled=false;
      LatDMSDirect[0].disabled=false;
      LonDMSDirect[0].disabled=false;
      LatDMSDirect[1].disabled=false;
      LonDMSDirect[1].disabled=false;
      LatDirect[0].disabled=true;
      LonDirect[0].disabled=true;
      LatDirect[1].disabled=true;
      LonDirect[1].disabled=true;
    }
  }
}

function setAllEnabled(Location) {
  with (Location) {
    Latitude.disabled=false;
    Longitude.disabled=false;
    LatDeg.disabled=false;
    LonDeg.disabled=false;
    LatMin.disabled=false;
    LonMin.disabled=false;
    LatSec.disabled=false;
    LonSec.disabled=false;
    LatDMSDirect[0].disabled=false;
    LonDMSDirect[0].disabled=false;
    LatDMSDirect[1].disabled=false;
    LonDMSDirect[1].disabled=false;
    LatDirect[0].disabled=false;
    LonDirect[0].disabled=false;
    LatDirect[1].disabled=false;
    LonDirect[1].disabled=false;
  }
}

function farthestPoint(lat,lon,LatDeg,LonDeg,LatMin,LonMin,LatSec,LonSec,LatDirect,LonDirect) {
  var farLat,farLon,farLat2,farLon2,farLatDeg,farLonDeg;
  var farLatMin,farLonMin,farLatSec,farLonSec,farLatDirect,farLonDirect;
  var dist;
  if (LatDirect == "N") {
    farLatDirect = "S";
  } else {
    farLatDirect = "N";
  }
  if (LonDirect == "E") {
    farLonDirect = "W";
  } else {
    farLonDirect = "E";
  }
  farLat = lat;
  farLatDeg = LatDeg;
  farLatMin = LatMin;
  farLatSec = LatSec;
  farLon = 180 - Math.abs(lon);

  // Method 1
  farLonDeg = Math.floor(farLon);
  farLonMin = Math.floor((farLon-farLonDeg)*60);
  farLonSec = (Math.round((((farLon - farLonDeg) - (farLonMin / 60 )) * 60 * 60) * 100 ) / 100);

  // Method 2
  /*
    farLonSec = 60 - LonSec;
    if (farLonSec == 60) {
      farLonSec=0;
    }
    if (farLonSec >0) {
      farLonMin = 60 - LonMin - 1;
    } else {
      farLonMin = 60 - LonMin ;
    }
    if (farLonMin ==60) {
      farLonMin =0;
    }
    if (farLonMin >0) {
      farLonDeg = 180 - Math.abs(farLonDeg) - 1;
    } else {
      farLonDeg = 180 - Math.abs(farLonDeg);
    }
  */
  farLon = Math.round(farLon*1000000)/1000000;
  farLonSec = Math.round(farLonSec*100)/100;
  elev = 200;
  farElev = 200;
  var dist = distance(lat,LatDirect,lon,LonDirect,elev,farLat,farLatDirect,farLon,farLonDirect,farElev);
  var alertMsg="";
  alertMsg+=("The location you entered is : " + "\n\n" +
  "Latitude: " + lat + " " + LatDirect + "\n" + "Degrees: " + LatDeg + " Minutes: " + LatMin + " Seconds: " + LatSec + " " + LatDirect + "\n\n" +
  "Longitude: " + lon + " " + LonDirect + "\n" + "Degrees: " + LonDeg + " Minutes: " + LonMin + " Seconds: " + LonSec + " " + LonDirect + "\n\n" +
  "---------------------------------------------------------------" + "\n");

  alertMsg+=("The farthest location from the point you entered is : " + "\n\n" +
  "Latitude: " + farLat + " " + farLatDirect + "\n" + "Degrees: " + farLatDeg + " Minutes: " + farLatMin + " Seconds: " + farLatSec + " " + farLatDirect + "\n\n" +
  "Longitude: " + farLon + " " + farLonDirect + "\n" + "Degrees: " + farLonDeg + " Minutes: " + farLonMin + " Seconds: " + farLonSec + " " + farLonDirect + "\n\n");

  alertMsg+=("---------------------------------------------------------------" + "\n");
  alertMsg+=("Distance: " + dist + " km ");

  alert(alertMsg);
}

function distance(lat,LatDirect,lon,LonDirect,elev,lat2,ptDirect,lon2,ptLonDirect,ptElev) {
  var radLat,radLon,radLat2,radLon2;
  if (ptDirect == "S")
    lat2 = lat2*-1;
  if (ptLonDirect == "W")
    lon2 = lon2*-1;
  if (LatDirect == "S")
    lat = lat*-1;
  if (LonDirect == "W")
    lon = lon*-1;
  var radian = 180/Math.PI;
  radLat=lat/radian;
  radLon=lon/radian;
  radLat2=lat2/radian;
  radLon2=lon2/radian;
  var dist = calcDistance(radLat,radLon,elev,radLat2,radLon2,ptElev);
  dist = Math.round(dist*100)/100;
  return dist;
}


// calculate the distance between two coordinates
function calcDistance(lat1,long1,elev,lat2,long2,ptElev) {
  var earthEquatorialRadius = 6378.14; // in kilometers
  var earthFlattened = 1/298.257;
  var exCentricityEarth = 0.08181922;
  var radian = 180/Math.PI;
  meanPosLat = (lat1+lat2)/2;
  meanNegLat = (lat1-lat2)/2;
  lambda = (long1-long2)/2;
  with(Math) {
    si = pow(sin(meanNegLat)*cos(lambda),2)+pow(cos(meanPosLat)*sin(lambda),2);
    co = pow(cos(meanNegLat)*cos(lambda),2)+pow(sin(meanPosLat)*sin(lambda),2);
    delta = atan(sqrt(si/co));
    ra = sqrt(si*co)/delta;
    di = 2*delta*earthEquatorialRadius;
    ha =(3*ra-1)/2/co;
    hb =(3*ra+1)/2/si;
    distances = di*(1+earthFlattened*ha*pow(sin(meanPosLat)*cos(meanNegLat),2)-earthFlattened*hb*pow(cos(meanPosLat)*sin(meanNegLat),2));
  }

  // Taking elevation into consideration
  var totalElev, elevDist
  totalElevDist = Math.abs(elev - ptElev);

  // Convert back to km
  totalElevDist = totalElevDist / 1000;
  elevDist = Math.sqrt((distances * distances) + (totalElevDist * totalElevDist));
  return elevDist;
}
// -->
</script>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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<div id="demo">
<form name="Locations">
<input class="script" type="radio" name="inputType" value="DD" checked onclick="clickedOption(this.form)"> <strong>
Degrees Decimal</strong>

<br>Latitude : <input class="script" name="Latitude" type="text" size="5">  
North <input class="script" type="radio" name="LatDirect" value="N"> South <input class="script" type="radio" name="LatDirect" value="S">

<br>Longitude: <input class="script" name="Longitude" type="text" size="5">  
East  <input class="script" type="radio" name="LonDirect" value="E"> West  <input class="script" type="radio" name="LonDirect" value="W">
<br>

<br><input class="script" type="radio" name="inputType" value="DMS" onclick="clickedOption(this.form)"> <strong>
Degrees, Minutes, &amp; Seconds</strong>
<br><strong>Latitude:</strong>
<br>Degrees: <input class="script" name="LatDeg" type="text" size="5" disabled>  

Minutes: <input class="script" name="LatMin" type="text" size="5" disabled>  
Seconds: <input class="script" name="LatSec" type="text" size="5" disabled>
<br>  North <input class="script" type="radio" name="LatDMSDirect" value="N" disabled>  
South <input class="script" type="radio" name="LatDMSDirect" value="S" disabled>
<br><strong>Longitude:</strong>
<br>Degrees: <input class="script" name="LonDeg" type="text" size="5" disabled>  
Minutes: <input class="script" name="LonMin" type="text" size="5" disabled>  
Seconds: <input class="script" name="LonSec" type="text" size="5" disabled>

<br>  East  <input class="script" type="radio" name="LonDMSDirect" value="E" disabled>    
West <input class="script" type="radio" name="LonDMSDirect" value="W" disabled>

<br><br><input class="script" value="Calculate" type="button" onclick="calc(this.form)">
<input class="script" name="Reset" type="reset" value="Clear" onclick="resetForm(this.form)">
</form>
</div>
	<!--
    	This script downloaded from www.JavaScriptBank.com
    	Come to view and download over 2000+ free javascript at www.JavaScriptBank.com
	-->

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30/01/2007
Joe Ho [more]
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JavaScript Latitude-Longitude Converter

5/5 1 votes / 2,845 previews / 0 comment 30/01/2007 Convert latitude and longitude from degree decimal to degree, minutes, and seconds and vice versa. This ...JavaScript Latitude-Longitude Converter - Latitude-Longitude Converter

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