Converting Degree, Minutes, Seconds (DMS) to decimal in PHP - php

Question

Currently, I'm learning to use Google Maps API. From what I read, the API require the latitude and longitude in Decimal Degree (DD).
In my database, the data is stored as DMS.
Example, 110° 29' 01.1"
I would to ask if you guys have any DMS to DD in php. And, the converter must accept from a single string like the example above.
Regards

Answer 1

You can try if this is working for you.
<?php
function DMStoDD($deg,$min,$sec)
{
// Converting DMS ( Degrees / minutes / seconds ) to decimal format
return $deg+((($min*60)+($sec))/3600);
}
function DDtoDMS($dec)
{
// Converts decimal format to DMS ( Degrees / minutes / seconds )
$vars = explode(".",$dec);
$deg = $vars[0];
$tempma = "0.".$vars[1];
$tempma = $tempma * 3600;
$min = floor($tempma / 60);
$sec = $tempma - ($min*60);
return array("deg"=>$deg,"min"=>$min,"sec"=>$sec);
}
?>

Answer 2

Here's one where you pass in the latitude,longitude in DMS values and returns the converted DMS string. Easy and simnple
function DECtoDMS($latitude, $longitude)
{
$latitudeDirection = $latitude < 0 ? 'S': 'N';
$longitudeDirection = $longitude < 0 ? 'W': 'E';
$latitudeNotation = $latitude < 0 ? '-': '';
$longitudeNotation = $longitude < 0 ? '-': '';
$latitudeInDegrees = floor(abs($latitude));
$longitudeInDegrees = floor(abs($longitude));
$latitudeDecimal = abs($latitude)-$latitudeInDegrees;
$longitudeDecimal = abs($longitude)-$longitudeInDegrees;
$_precision = 3;
$latitudeMinutes = round($latitudeDecimal*60,$_precision);
$longitudeMinutes = round($longitudeDecimal*60,$_precision);
return sprintf('%s%s° %s %s %s%s° %s %s',
$latitudeNotation,
$latitudeInDegrees,
$latitudeMinutes,
$latitudeDirection,
$longitudeNotation,
$longitudeInDegrees,
$longitudeMinutes,
$longitudeDirection
);
}

Answer 3

I wrote a PHP function that does what the question asks: converts a string in degrees/minutes/seconds into decimal degrees. It accepts a number of different formats for the string, and honors direction (NSEW).
Here is the code:
<?php
function convertDMSToDecimal($latlng) {
$valid = false;
$decimal_degrees = 0;
$degrees = 0; $minutes = 0; $seconds = 0; $direction = 1;
// Determine if there are extra periods in the input string
$num_periods = substr_count($latlng, '.');
if ($num_periods > 1) {
$temp = preg_replace('/\./', ' ', $latlng, $num_periods - 1); // replace all but last period with delimiter
$temp = trim(preg_replace('/[a-zA-Z]/','',$temp)); // when counting chunks we only want numbers
$chunk_count = count(explode(" ",$temp));
if ($chunk_count > 2) {
$latlng = $temp; // remove last period
} else {
$latlng = str_replace("."," ",$latlng); // remove all periods, not enough chunks left by keeping last one
}
}
// Remove unneeded characters
$latlng = trim($latlng);
$latlng = str_replace("º","",$latlng);
$latlng = str_replace("'","",$latlng);
$latlng = str_replace("\"","",$latlng);
$latlng = substr($latlng,0,1) . str_replace('-', ' ', substr($latlng,1)); // remove all but first dash
if ($latlng != "") {
// DMS with the direction at the start of the string
if (preg_match("/^([nsewNSEW]?)\s*(\d{1,3})\s+(\d{1,3})\s+(\d+\.?\d*)$/",$latlng,$matches)) {
$valid = true;
$degrees = intval($matches[2]);
$minutes = intval($matches[3]);
$seconds = floatval($matches[4]);
if (strtoupper($matches[1]) == "S" || strtoupper($matches[1]) == "W")
$direction = -1;
}
// DMS with the direction at the end of the string
if (preg_match("/^(-?\d{1,3})\s+(\d{1,3})\s+(\d+(?:\.\d+)?)\s*([nsewNSEW]?)$/",$latlng,$matches)) {
$valid = true;
$degrees = intval($matches[1]);
$minutes = intval($matches[2]);
$seconds = floatval($matches[3]);
if (strtoupper($matches[4]) == "S" || strtoupper($matches[4]) == "W" || $degrees < 0) {
$direction = -1;
$degrees = abs($degrees);
}
}
if ($valid) {
// A match was found, do the calculation
$decimal_degrees = ($degrees + ($minutes / 60) + ($seconds / 3600)) * $direction;
} else {
// Decimal degrees with a direction at the start of the string
if (preg_match("/^(-?\d+(?:\.\d+)?)\s*([nsewNSEW]?)$/",$latlng,$matches)) {
$valid = true;
if (strtoupper($matches[2]) == "S" || strtoupper($matches[2]) == "W" || $degrees < 0) {
$direction = -1;
$degrees = abs($degrees);
}
$decimal_degrees = $matches[1] * $direction;
}
// Decimal degrees with a direction at the end of the string
if (preg_match("/^([nsewNSEW]?)\s*(\d+(?:\.\d+)?)$/",$latlng,$matches)) {
$valid = true;
if (strtoupper($matches[1]) == "S" || strtoupper($matches[1]) == "W")
$direction = -1;
$decimal_degrees = $matches[2] * $direction;
}
}
}
if ($valid) {
return $decimal_degrees;
} else {
return false;
}
}
?>
Here it is on Github with test cases: https://github.com/prairiewest/PHPconvertDMSToDecimal

Answer 4

Solved.
<?php
function DMStoDD($input)
{
$deg = " " ;
$min = " " ;
$sec = " " ;
$inputM = " " ;
print "<br> Input is ".$input." <br>";
for ($i=0; $i < strlen($input); $i++)
{
$tempD = $input[$i];
//print "<br> TempD [$i] is : $tempD";
if ($tempD == iconv("UTF-8", "ISO-8859-1//TRANSLIT", '°') )
{
$newI = $i + 1 ;
//print "<br> newI is : $newI";
$inputM = substr($input, $newI, -1) ;
break;
}//close if degree
$deg .= $tempD ;
}//close for degree
//print "InputM is ".$inputM." <br>";
for ($j=0; $j < strlen($inputM); $j++)
{
$tempM = $inputM[$j];
//print "<br> TempM [$j] is : $tempM";
if ($tempM == "'")
{
$newI = $j + 1 ;
//print "<br> newI is : $newI";
$sec = substr($inputM, $newI, -1) ;
break;
}//close if minute
$min .= $tempM ;
}//close for min
$result = $deg+( (( $min*60)+($sec) ) /3600 );
print "<br> Degree is ". $deg*1 ;
print "<br> Minutes is ". $min ;
print "<br> Seconds is ". $sec ;
print "<br> Result is ". $result ;
return $deg + ($min / 60) + ($sec / 3600);
}
?>

Answer 5

If you also want to include the reference, you might want to use this function:
function DMStoDD($ref, $deg, $min, $sec)
{
$n = $deg + (($min * 60 + $sec) / 3600);
if (($ref == "S") or ($ref == "W")) {
return -$n;
} else {
return $n;
}
}

Answer 6

This works very well:
<?php echo "<td> $deg&#176 $min' $sec&#8243 </td>"; ?>
where deg, min and sec are the angular co-ordinates.