<?php
// ll_conv.php (longitude/latitude conversions)
// Sexagesimal to decimal (and reverse) to store in the database
// 48° 51' 15.29" N => 48.8542472222
// -124.54824759 => 124° 32' 53.69" W
// Pierre FAUQUE 02-03/09/2009
// pierre@fauque.net
// --- Texts. can be translated -------
define(TXT_TITL, "Angle conversions. (sexagesimal <==> decimal)");
define(TXT_CONV, "Conversions");
define(TXT_CVRT, "Convert");
define(TXT_LONG, "Longitude");
define(TXT_LATI, "Latitude");
define(TXT_LATN, "North latitude");
define(TXT_LATS, "South latitude");
define(TXT_LONE, "Est longitude");
define(TXT_LONW, "West longitude");
define(TXT_NOTA, "NB: Decimal separator is a dot, not a comma");
// ------------------------------------
?>
<html>
<head>
<title><?php echo TXT_TITL; ?></title>
</head>
<body>
<?php
if($_POST['submit']) {
// --- sexagesimal to decimal
if($_POST['conv'] == 'sexdec') {
switch($_POST['where']) {
case 'E' : $coef = 1; break;
case 'N' : $coef = 1; break;
case 'W' : $coef = -1; break;
case 'S' : $coef = -1; break;
}
if($_POST['sec']) { $nbsec = $_POST['sec']; } else { $nbsec = 0; }
if($_POST['min']) { $nbmin = $_POST['min']; } else { $nbmin = 0; }
$deg_in = $_POST['deg'].'° '.$nbmin.'\' '.$nbsec.'" '.$_POST['where'];
$deg_out = ($_POST['deg']+((($nbmin*60)+$nbsec)/3600))*$coef;
$resultat = $deg_in.' ==> '.$deg_out."<hr>\n";
}
// --- decimal to sexagesimal
if($_POST['conv'] == 'decsex') {
$coords = $_POST['coords'];
$deg_in = $coords;
if($_POST['where'] == 'lat') {
if($coords >= 0) { $pc = 'N'; } else { $pc = 'S'; $coords *= -1; } }
else {
if($coords >= 0) { $pc = 'E'; } else { $pc = 'W'; $coords *= -1; }
}
$deg = floor($coords);
$nbsec = ($coords-$deg)*3600;
$min = floor($nbsec/60);
$sec = round($nbsec-($min*60),2);
if($sec == 60) { $sec = 0; $min +=1; }
if($min == 60) { $min = 0; $deg +=1; }
$deg_out = $deg.'° '.$min.'\' '.$sec.'" '.$pc;
$resultat = $deg_in.' ==> '.$deg_out."<hr>\n";
}
}
echo $resultat;
?>
<!-- sexagesimal to decimal -->
<form name='sexdec' method='post' action='<?php echo $_SERVER['PHP_SELF']; ?>'>
<table border='0'>
<tr>
<td width='400'>
Deg: <input type='text' name='deg' size='3'>
Min: <input type='text' name='min' size='3'>
Sec: <input type='text' name='sec' size='3'>
<select name='where'>
<option value='N'><?php echo TXT_LATN; ?>
<option value='S'><?php echo TXT_LATS; ?>
<option value='E'><?php echo TXT_LONE; ?>
<option value='W'><?php echo TXT_LONW; ?>
</select>
<input type='hidden' name='conv' value='sexdec'>
</td><td>
<input type='submit' name='submit' value='<?php echo TXT_CVRT; ?>'>
</td>
</tr>
</table>
</form>
<!-- decimal to sexagesimal -->
<form name='decsex' method='post' action='<?php echo $_SERVER['PHP_SELF']; ?>'>
<table border='0'>
<tr>
<td width='400'>
Deg (dec.): <input type='text' name='coords' size='23'>
<select name='where'>
<option value='lat'><?php echo TXT_LATI; ?>
<option value='lon'><?php echo TXT_LONG; ?>
</select>
<input type='hidden' name='conv' value='decsex'>
</td><td>
<input type='submit' name='submit' value='<?php echo TXT_CVRT; ?>'>
</td>
</tr>
</table>
</form>
<span style='color:#909090'><?php echo TXT_NOTA; ?></span>
</body>
</html>
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