La conversion de Degrés, Minutes, Secondes (DMS) en décimal en PHP

Résolu.

 <?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);
}
?>

OriginalL'auteur Azlan Nohara

J'ai écrit une fonction PHP qui fait ce que la question se pose: convertit une chaîne en degrés/minutes/secondes en degrés décimaux. Il accepte un certain nombre de différents formats de la chaîne, et les honneurs de la direction (nord sud est ouest).

Voici le 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;
}
}
?>

Ici, il est sur Github avec des cas de test: https://github.com/prairiewest/PHPconvertDMSToDecimal

OriginalL'auteur Todd Trann