Full version: jsB@nk » Calculation » Latitude-Longitude Converter
URL: https://www.javascriptbank.com/latitude-longitude-converter.html
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.
Full version: jsB@nk » Calculation » Latitude-Longitude Converter
URL: https://www.javascriptbank.com/latitude-longitude-converter.html
<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 coordinatesfunction 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--><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, & 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-->