Я написал функцию PHP, которая выполняет то, что задает вопрос: преобразует строку в градусах / минутах / секундах в десятичные градусы. Он принимает ряд различных форматов строки и учитывает направление (NSEW).
Вот код:
<?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;
}
}
?>
Вот он на Github с тестовыми примерами: https://github.com/prairiewest/PHPconvertDMSToDecimal
person
Todd Trann
schedule
14.07.2015