function _weather_parse_wind in Weather 7

Same name and namespace in other branches

1. 5.6 weather_parser.inc \_weather_parse_wind()
2. 5 weather_parser.inc \_weather_parse_wind()
3. 6.5 weather_parser.inc \_weather_parse_wind()

Extract wind information.

Parameters

string $metar_raw: Raw METAR data to parse.

object $metar: METAR data object, may be altered.

1 call to _weather_parse_wind()

weather_parse_metar in ./weather_parser.inc

Parses a raw METAR data string.

File

./weather_parser.inc, line 512

Retrieves and parses raw METAR data and stores result in database.

Code

function _weather_parse_wind($metar_raw, &$metar) {
  if (preg_match('/^' . '([0-9]{3}|VRB)' . '([0-9]{2,3})' . '(G([0-9]{2,3}))?' . '(KT|MPS|KMH)' . '$/', $metar_raw, $matches)) {
    if ($matches[1] == 'VRB') {
      $metar->wind_direction = 'variable';
    }
    else {
      $metar->wind_direction = (int) $matches[1];
    }
    $wind_speed = (int) $matches[2];
    $wind_gusts = (int) $matches[4];
    $wind_unit = $matches[5];

    // Ensure that windspeed is in km/h.
    switch ($wind_unit) {
      case 'KT':

        // Convert from knots (1 knot = 1.852 km/h)
        $metar->wind_speed = round($wind_speed * 1.852, 1);
        if ($wind_gusts > 0) {
          $metar->wind_gusts = round($wind_gusts * 1.852, 1);
        }
        break;
      case 'MPS':

        // Convert from meter/s (1 m/s = 3.6 km/h)
        $metar->wind_speed = round($wind_speed * 3.6, 1);
        if ($wind_gusts > 0) {
          $metar->wind_gusts = round($wind_gusts * 3.6, 1);
        }
        break;
      case 'KMH':
        $metar->wind_speed = $wind_speed;
        if ($wind_gusts > 0) {
          $metar->wind_gusts = $wind_gusts;
        }
        break;
    }
  }
  elseif (preg_match('/^' . '([0-9]{3})' . 'V' . '([0-9]{3})' . '$/', $metar_raw, $matches)) {
    $metar->wind_direction = $matches[1] . '-' . $matches[2];
  }
}