public function LineString::haversineLength in geoPHP 7

Same name and namespace in other branches

1. 8 geoPHP/lib/geometry/LineString.class.php \LineString::haversineLength()

Overrides Collection::haversineLength

File

geoPHP/lib/geometry/LineString.class.php, line 107

Class

LineString

LineString. A collection of Points representing a line. A line can have more than one segment.

Code

public function haversineLength() {
  $degrees = 0;
  $points = $this
    ->getPoints();
  for ($i = 0; $i < $this
    ->numPoints() - 1; $i++) {
    $point = $points[$i];
    $next_point = $points[$i + 1];
    if (!is_object($next_point)) {
      continue;
    }
    $degree = rad2deg(acos(sin(deg2rad($point
      ->getY())) * sin(deg2rad($next_point
      ->getY())) + cos(deg2rad($point
      ->getY())) * cos(deg2rad($next_point
      ->getY())) * cos(deg2rad(abs($point
      ->getX() - $next_point
      ->getX())))));
    $degrees += $degree;
  }

  // Returns degrees
  return $degrees;
}