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<?php
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/* $Id: weather_parser.inc,v 1.21.2.7 2009/09/28 12:05:48 toddy Exp $
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*
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* Copyright © 2006-2009 Tobias Quathamer <t.quathamer@gmx.net>
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*
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* This file is part of the Drupal Weather module.
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*
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* Weather is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* Weather is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Weather; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* Parses a raw METAR data string
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*/
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function weather_parse_metar($metar_raw_string) {
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// Some stations insert a space between the cloud conditions
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// and the altitude, e.g. "FEW 025" instead of "FEW025".
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// Therefore, we scan for such occurences and remove the space.
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$metar_raw_string = preg_replace("/(FEW|SCT|BKN|OVC)\s+([0-9]{3})/",
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'$1$2', $metar_raw_string);
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// Setup the metar data array
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$metar = array();
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$metar['#raw'] = $metar_raw_string;
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// Split string for parsing routines
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$raw_items = preg_split('/\s+/', strtoupper($metar_raw_string));
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// Run the data through the METAR routines
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foreach ($raw_items as $metar_raw) {
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if (_weather_parse_stop($metar_raw, $metar)) break;
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_weather_parse_icao($metar_raw, $metar);
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_weather_parse_timestamp($metar_raw, $metar);
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_weather_parse_reporttype($metar_raw, $metar);
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_weather_parse_wind($metar_raw, $metar);
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_weather_parse_visibility($metar_raw, $metar);
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_weather_parse_condition($metar_raw, $metar);
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_weather_parse_phenomena($metar_raw, $metar);
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_weather_parse_temperature($metar_raw, $metar);
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_weather_parse_pressure($metar_raw, $metar);
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}
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// Calculate sunrise and sunset times
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_weather_calculate_sunrise_sunset($metar);
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return $metar;
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}
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/**
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* Decide whether to stop parsing
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*
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* @param string Raw METAR data to parse
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* @param array Parsed METAR data, will be altered
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* @return boolean
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*/
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function _weather_parse_stop($metar_raw, &$metar) {
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if (preg_match('/^(BECMG|TEMPO|NOSIG|RMK)$/', $metar_raw)) {
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return TRUE;
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}
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else {
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return FALSE;
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}
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}
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/**
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* Extract the ICAO code
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*
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* ICAO = International Civil Aviation Organization, this is a four
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* letter airport code, e. g. EDDH
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*
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* @param string Raw METAR data to parse
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* @param array Parsed METAR data, will be altered
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*/
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function _weather_parse_icao($metar_raw, &$metar) {
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if (preg_match('/^([A-Z]{4}|K[A-Z0-9]{3})$/', $metar_raw) and !isset($metar['icao'])) {
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$metar['icao'] = $metar_raw;
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}
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}
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/**
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* Extract the timestamp
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*
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* @param string Raw METAR data to parse
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* @param array Parsed METAR data, will be altered
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*/
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function _weather_parse_timestamp($metar_raw, &$metar) {
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if (preg_match('/^([0-9]{2})([0-9]{2})([0-9]{2})Z$/', $metar_raw, $matches)) {
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$timestamp['year'] = gmdate('Y');
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$timestamp['month'] = gmdate('n');
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$timestamp['day'] = $matches[1];
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$timestamp['hour'] = $matches[2];
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$timestamp['minute'] = $matches[3];
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// if the current day is lower than the one from the METAR data,
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// it must be a day from last month
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// Note: in case even the year wraps (month = 0 -> month = 12, year--),
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// the gmmktime() function further down will take care of this.
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if (gmdate('d') < $timestamp['day']) {
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$timestamp['month']--;
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}
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$metar['reported_on'] = gmmktime($timestamp['hour'],
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$timestamp['minute'],
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0, // these are the seconds
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$timestamp['month'],
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$timestamp['day'],
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$timestamp['year']);
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}
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}
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/**
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* Extract the report type
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*
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* This may be missing in the METAR data. If present, it should be
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* either AUTO or COR.
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*
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* @param string Raw METAR data to parse
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* @param array Parsed METAR data, will be altered
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*/
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function _weather_parse_reporttype($metar_raw, &$metar) {
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if (preg_match('/^(AUTO|COR)$/', $metar_raw)) {
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$metar['reporttype'] = $metar_raw;
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}
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}
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/**
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* Extract the wind information
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*
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* @param string Raw METAR data to parse
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* @param array Parsed METAR data, will be altered
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*/
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function _weather_parse_wind($metar_raw, &$metar) {
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if (preg_match('/^'.
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'([0-9]{3}|VRB)'. // Wind direction from true north or VRB for variable
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'([0-9]{2,3})'. // Wind speed, two or three numbers
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'(G([0-9]{2,3}))?'. // Gusts, two or three digits (optional)
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'(KT|MPS|KMH)'. // Measurement unit (knots, meter/s, or km/h)
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'$/', $metar_raw, $matches)) {
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$metar['wind']['direction'] = (int) $matches[1];
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$wind_speed = (int) $matches[2];
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$wind_gusts = (int) $matches[4];
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$wind_unit = $matches[5];
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// Do a conversion to other formats
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switch ($wind_unit) {
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case 'KT':
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// Convert from knots to km/h, mph, and mps
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// nautical mile = 1852 meters
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// statue mile = 1609.344 meters
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$metar['wind']['speed_knots'] = $wind_speed;
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$metar['wind']['gusts_knots'] = $wind_gusts;
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$metar['wind']['speed_kmh'] = round($wind_speed * 1.852, 1);
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$metar['wind']['gusts_kmh'] = round($wind_gusts * 1.852, 1);
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$metar['wind']['speed_mph'] = round($wind_speed * 1.151, 1);
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$metar['wind']['gusts_mph'] = round($wind_gusts * 1.151, 1);
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$metar['wind']['speed_mps'] = round($wind_speed * 0.514, 1);
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$metar['wind']['gusts_mps'] = round($wind_gusts * 0.514, 1);
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break;
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case 'MPS':
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// Convert from meter/s to knots, km/h and mph
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// nautical mile = 1852 meters
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// statue mile = 1609.344 meters
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$metar['wind']['speed_knots'] = round($wind_speed * 1.944, 1);
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$metar['wind']['gusts_knots'] = round($wind_gusts * 1.944, 1);
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$metar['wind']['speed_kmh'] = round($wind_speed * 3.6, 1);
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$metar['wind']['gusts_kmh'] = round($wind_gusts * 3.6, 1);
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$metar['wind']['speed_mph'] = round($wind_speed * 2.237, 1);
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$metar['wind']['gusts_mph'] = round($wind_gusts * 2.237, 1);
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$metar['wind']['speed_mps'] = $wind_speed;
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$metar['wind']['gusts_mps'] = $wind_gusts;
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break;
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case 'KMH':
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// Convert from km/h to knots, mph, and mps
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// nautical mile = 1852 meters
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// statue mile = 1609.344 meters
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$metar['wind']['speed_knots'] = round($wind_speed * 0.540, 1);
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$metar['wind']['gusts_knots'] = round($wind_gusts * 0.540, 1);
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$metar['wind']['speed_kmh'] = $wind_speed;
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$metar['wind']['gusts_kmh'] = $wind_gusts;
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$metar['wind']['speed_mph'] = round($wind_speed * 0.621, 1);
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$metar['wind']['gusts_mph'] = round($wind_gusts * 0.621, 1);
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$metar['wind']['speed_mps'] = round($wind_speed * 0.278, 1);
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$metar['wind']['gusts_mps'] = round($wind_gusts * 0.278, 1);
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break;
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}
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$metar['wind']['speed_beaufort'] = _weather_calculate_beaufort($metar['wind']['speed_kmh']);
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$metar['wind']['gusts_beaufort'] = _weather_calculate_beaufort($metar['wind']['gusts_kmh']);
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}
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else if (preg_match('/^'.
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'([0-9]{3})'. // Variable wind direction, start
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'V'. // Marker for "V"ariable
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'([0-9]{3})'. // Variable wind direction, end
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'$/', $metar_raw, $matches)) {
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$metar['wind']['variable_start'] = (int) $matches[1];
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$metar['wind']['variable_end'] = (int) $matches[2];
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}
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}
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/**
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* Extract the visibility information
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*
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* @param string Raw METAR data to parse
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* @param array Parsed METAR data, will be altered
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*/
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function _weather_parse_visibility($metar_raw, &$metar) {
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if (preg_match('/^([0-9])$/', $metar_raw, $matches)) {
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// Special case: A single digit, e.g. in 1 1/2SM
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$metar['visibility']['#visibility_miles'] = $matches[1];
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}
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else if (preg_match('/^'.
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'(M?)([0-9])(\/?)([0-9]*)'.
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'SM'.
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'$/', $metar_raw, $matches)) {
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if ($matches[3] == '/') {
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// This is a fractional visibility, we need to convert this
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$visibility = $metar['visibility']['#visibility_miles'] + $matches[2] / $matches[4];
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}
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else {
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$visibility = $matches[2] . $matches[4];
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}
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$metar['visibility']['miles'] = $visibility;
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$metar['visibility']['kilometers'] = round($visibility * 1.609344, 1);
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}
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else if (preg_match('/^([0-9]{4})(NDV)?$/', $metar_raw, $matches)) {
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// NDV means "no directional variation", used by automatic stations
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$metar['visibility']['kilometers'] = round($matches[1] / 1000, 1);
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$metar['visibility']['miles'] = round($metar['visibility']['kilometers'] / 1.609344, 1);
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}
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}
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/**
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* Extract the phenomena information
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*
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* @param string Raw METAR data to parse
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* @param array Parsed METAR data, will be altered
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*/
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function _weather_parse_phenomena($metar_raw, &$metar) {
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if (preg_match('/^'.
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'(-|\+|VC)?'. // Intensity or Proximity
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'(SH|TS|FZ)?'. // Descriptor
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'RA'. // Rain
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'$/', $metar_raw, $matches)) {
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$phen = array();
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if (isset($matches[1])) {
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switch ($matches[1]) {
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case '-': $phen['#light'] = TRUE; break;
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case '+': $phen['#heavy'] = TRUE; break;
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default: $phen['#moderate'] = TRUE;
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}
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}
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if (isset($matches[2])) {
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switch ($matches[2]) {
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case 'SH': $phen['#showers'] = TRUE; break;
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case 'FZ': $phen['#freezing'] = TRUE; break;
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}
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}
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$metar['phenomena']['rain'] = $phen;
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}
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else if (preg_match('/^'.
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'(-|\+|VC)?'. // Intensity or Proximity
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'(FZ)?'. // Descriptor
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'DZ'. // Drizzle
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'$/', $metar_raw, $matches)) {
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$phen = array();
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if (isset($matches[1])) {
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switch ($matches[1]) {
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case '-': $phen['#light'] = TRUE; break;
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case '+': $phen['#heavy'] = TRUE; break;
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default: $phen['#moderate'] = TRUE;
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}
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}
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if (isset($matches[2])) {
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switch ($matches[2]) {
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case 'FZ': $phen['#freezing'] = TRUE; break;
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}
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}
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$metar['phenomena']['drizzle'] = $phen;
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}
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else if (preg_match('/^'.
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'(-|\+|VC)?'. // Intensity or Proximity
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'(BL|DR)?'. // Descriptor
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'SN'. // Snow
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'$/', $metar_raw, $matches)) {
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$phen = array();
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if (isset($matches[1])) {
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switch ($matches[1]) {
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case '-': $phen['#light'] = TRUE; break;
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case '+': $phen['#heavy'] = TRUE; break;
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default: $phen['#moderate'] = TRUE;
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}
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}
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if (isset($matches[2])) {
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switch ($matches[2]) {
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case 'BL': $phen['#blowing'] = TRUE; break;
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case 'DR': $phen['#low_drifting'] = TRUE; break;
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}
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}
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$metar['phenomena']['snow'] = $phen;
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}
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else if (preg_match('/^'.
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'BR'. // Mist
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'$/', $metar_raw, $matches)) {
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$metar['phenomena']['#mist'] = TRUE;
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}
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else if (preg_match('/^'.
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'(VC|MI|PR|BC)?'. // Proximity (VC) or Descriptor
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'FG'. // Fog
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'$/', $metar_raw, $matches)) {
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$phen = array();
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if (isset($matches[1])) {
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switch ($matches[1]) {
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case 'MI': $phen['#shallow'] = TRUE; break;
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case 'PR': $phen['#partial'] = TRUE; break;
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case 'BC': $phen['#patches'] = TRUE; break;
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}
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}
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$metar['phenomena']['fog'] = $phen;
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}
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else if (preg_match('/^'.
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'FU'. // Smoke
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'$/', $metar_raw, $matches)) {
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$metar['phenomena']['#smoke'] = TRUE;
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}
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}
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/**
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* Extract the condition information
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| 356 |
*
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* @param string Raw METAR data to parse
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* @param array Parsed METAR data, will be altered
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*/
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function _weather_parse_condition($metar_raw, &$metar) {
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$ordering = array(
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1 => array('CLR' => 'clear'),
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2 => array('FEW' => 'few'),
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3 => array('SCT' => 'scattered'),
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4 => array('BKN' => 'broken'),
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5 => array('OVC' => 'overcast')
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);
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$metar['condition_order'] = -1;
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if (preg_match('/^'.
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'(FEW|SCT|BKN|OVC)([0-9]{3})'.
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'(CB|TCU)?(\/\/\/)?'.
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'$/', $metar_raw, $matches)) {
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foreach ($ordering as $order => $data) {
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if (key($data) == $matches[1]) {
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$metar['#condition_text'][] = $data[key($data)];
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$metar['#condition_order'][] = $order;
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break;
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}
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}
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}
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else if (preg_match('/^'.
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'(CLR|SKC|CAVOK)'.
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'$/', $metar_raw, $matches)) {
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$metar['#condition_text'][] = 'clear';
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$metar['#condition_order'][] = 1;
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if ($matches[1] == 'CAVOK') {
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$metar['visibility']['kilometers'] = 10;
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$metar['visibility']['miles'] = round($metar['visibility']['kilometers'] / 1.609344, 1);
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}
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}
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else if (preg_match('/^'.
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'(NSC|NCD)'.
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'$/', $metar_raw, $matches)) {
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// NSC means no significant clouds,
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// NCD is from automatic stations, no cloud detected
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$metar['#condition_text'][] = 'no-significant-clouds';
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$metar['#condition_order'][] = 1;
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}
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else if (preg_match('/^'.
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'VV[0-9\/]{3}'.
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'$/', $metar_raw, $matches)) {
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// VV is the vertical visibility, this should be shown as overcast.
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// If no information is available, VV/// will be used.
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$metar['#condition_text'][] = 'overcast';
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$metar['#condition_order'][] = 5;
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}
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| 407 |
if (isset($metar['#condition_order'])) {
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foreach ($metar['#condition_order'] as $index => $order) {
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if ($order > $metar['condition_order']) {
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$metar['condition_order'] = $order;
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$metar['condition_text'] = $metar['#condition_text'][$index];
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}
|
| 413 |
}
|
| 414 |
}
|
| 415 |
}
|
| 416 |
|
| 417 |
|
| 418 |
|
| 419 |
/**
|
| 420 |
* Extract the temperature information
|
| 421 |
*
|
| 422 |
* @param string Raw METAR data to parse
|
| 423 |
* @param array Parsed METAR data, will be altered
|
| 424 |
*/
|
| 425 |
function _weather_parse_temperature($metar_raw, &$metar) {
|
| 426 |
if (preg_match('/^'.
|
| 427 |
'(M?[0-9]{2})'. // Temperature (M indicates negative temperatures)
|
| 428 |
'\/'. // Slash is the separator
|
| 429 |
'(M?[0-9]{2}|XX)?'. // Optional: Dew point temperature, may be 'XX'
|
| 430 |
'$/', $metar_raw, $matches)) {
|
| 431 |
$metar['temperature']['celsius'] = (int) strtr($matches[1], 'M', '-');
|
| 432 |
$metar['temperature']['fahrenheit'] =
|
| 433 |
round($metar['temperature']['celsius'] * 9/5 + 32, 1);
|
| 434 |
if (isset($matches[2]) and $matches[2] != 'XX') {
|
| 435 |
$metar['dewpoint']['celsius'] = (int) strtr($matches[2], 'M', '-');
|
| 436 |
$metar['dewpoint']['fahrenheit'] =
|
| 437 |
round($metar['dewpoint']['celsius'] * 9/5 + 32, 1);
|
| 438 |
}
|
| 439 |
}
|
| 440 |
}
|
| 441 |
|
| 442 |
|
| 443 |
|
| 444 |
/**
|
| 445 |
* Extract the pressure information
|
| 446 |
*
|
| 447 |
* @param string Raw METAR data to parse
|
| 448 |
* @param array Parsed METAR data, will be altered
|
| 449 |
*/
|
| 450 |
function _weather_parse_pressure($metar_raw, &$metar) {
|
| 451 |
if (preg_match('/^'.
|
| 452 |
'(A|Q)([0-9]{4})'. // Pressure, either inHg (A) or hPa (Q)
|
| 453 |
'$/', $metar_raw, $matches)) {
|
| 454 |
if ($matches[1] == 'A') {
|
| 455 |
// Pressure is given in inch Hg
|
| 456 |
$metar['pressure']['inHg'] = $matches[2] / 100;
|
| 457 |
$metar['pressure']['mmHg'] = round($metar['pressure']['inHg'] * 25.4, 0);
|
| 458 |
$metar['pressure']['hPa'] = round($metar['pressure']['inHg'] * 33.8639, 0);
|
| 459 |
$metar['pressure']['kPa'] = round($metar['pressure']['inHg'] * 3.38639, 1);
|
| 460 |
}
|
| 461 |
else {
|
| 462 |
// Pressure is given in HektoPascal, hPa
|
| 463 |
$metar['pressure']['hPa'] = (int) $matches[2];
|
| 464 |
$metar['pressure']['inHg'] = round($metar['pressure']['hPa'] * 0.02953, 2);
|
| 465 |
$metar['pressure']['mmHg'] = round($metar['pressure']['inHg'] * 25.4, 0);
|
| 466 |
$metar['pressure']['kPa'] = round($metar['pressure']['inHg'] * 3.38639, 1);
|
| 467 |
}
|
| 468 |
}
|
| 469 |
}
|
| 470 |
|
| 471 |
|
| 472 |
|
| 473 |
/**
|
| 474 |
* Calculate the times of sunrise and sunset
|
| 475 |
*
|
| 476 |
* The times are GMT, so it's possible for the sunrise being
|
| 477 |
* at 16:48 while the sun sets at 7:06.
|
| 478 |
*
|
| 479 |
* @param array Parsed METAR data, will be altered
|
| 480 |
*/
|
| 481 |
function _weather_calculate_sunrise_sunset(&$metar) {
|
| 482 |
$info = weather_get_latitude_longitude($metar['icao']);
|
| 483 |
|
| 484 |
// reported_on is already GMT, so don't use gmdate()
|
| 485 |
$day_of_year = date('z', $metar['reported_on']);
|
| 486 |
$year = date('Y', $metar['reported_on']);
|
| 487 |
$month = date('m', $metar['reported_on']);
|
| 488 |
$day = date('d', $metar['reported_on']);
|
| 489 |
|
| 490 |
// setup pi constants: 0.5*pi, 1.0*pi, 1.5*pi, 2.0*pi
|
| 491 |
$pi_05 = 1.570796;
|
| 492 |
$pi_10 = 3.141593;
|
| 493 |
$pi_15 = 4.712389;
|
| 494 |
$pi_20 = 6.283185;
|
| 495 |
|
| 496 |
// convert latitude and longitude degree into radian
|
| 497 |
// x rad = y° * pi / 180 = 0.017453 * y°
|
| 498 |
$latitude = 0.017453 * $info['latitude'];
|
| 499 |
$longitude = 0.017453 * $info['longitude'];
|
| 500 |
|
| 501 |
// we want always GMT time, so set to 0. Otherwise,
|
| 502 |
// the timezone can be calculated as follows:
|
| 503 |
// $timezone = 0.261799 * offset;
|
| 504 |
$timezone = 0;
|
| 505 |
|
| 506 |
// the sunrise/sunset altitude in radian (-0.833°)
|
| 507 |
$altitude = -0.014539;
|
| 508 |
|
| 509 |
$sunrise = 0;
|
| 510 |
$sunset = 0;
|
| 511 |
foreach (array('sunrise' => $pi_05, 'sunset' => $pi_15) as $type => $factor) {
|
| 512 |
$a = $day_of_year + ($factor - $longitude) / $pi_20;
|
| 513 |
// solar mean anomaly
|
| 514 |
$sma = $a * 0.017202 - 0.0574039;
|
| 515 |
// solar true longitude
|
| 516 |
$stl = $sma + 0.0334405 * sin($sma);
|
| 517 |
$stl += 4.93289 + 3.49066E-04 * sin(2 * $sma);
|
| 518 |
|
| 519 |
// normalize the longitude to be between >= 0 and < 2.0*pi
|
| 520 |
while ($stl < 0) {
|
| 521 |
$stl += $pi_20;
|
| 522 |
}
|
| 523 |
while ($stl >= $pi_20) {
|
| 524 |
$stl -= $pi_20;
|
| 525 |
}
|
| 526 |
|
| 527 |
if ($stl / $pi_05 - intval($stl / $pi_05) == 0) {
|
| 528 |
$stl += 4.84814E-06;
|
| 529 |
}
|
| 530 |
|
| 531 |
// solar right ascension
|
| 532 |
$sra = sin($stl) / cos($stl);
|
| 533 |
$sra = atan2(0.91746 * $sra, 1);
|
| 534 |
|
| 535 |
// adjust quadrant
|
| 536 |
if ($stl > $pi_15) {
|
| 537 |
$sra += $pi_20;
|
| 538 |
}
|
| 539 |
else if ($stl > $pi_05) {
|
| 540 |
$sra += $pi_10;
|
| 541 |
}
|
| 542 |
|
| 543 |
// solar declination
|
| 544 |
$sd = 0.39782 * sin($stl);
|
| 545 |
$sd = $sd / sqrt(1 - $sd * $sd);
|
| 546 |
$sd = atan2($sd, 1);
|
| 547 |
|
| 548 |
$diurnal_arc = ($altitude - sin($sd) * sin($latitude)) / (cos($sd) * cos($latitude));
|
| 549 |
|
| 550 |
// is there a sunrise or sunset at all?
|
| 551 |
if ($diurnal_arc >= 1) {
|
| 552 |
// no sunrise
|
| 553 |
$no_sunrise = TRUE;
|
| 554 |
break;
|
| 555 |
}
|
| 556 |
if ($diurnal_arc <= -1) {
|
| 557 |
// no sunset
|
| 558 |
$no_sunset = TRUE;
|
| 559 |
break;
|
| 560 |
}
|
| 561 |
|
| 562 |
$diurnal_arc = $diurnal_arc / sqrt(1 - $diurnal_arc * $diurnal_arc);
|
| 563 |
$diurnal_arc = $pi_05 - atan2($diurnal_arc, 1);
|
| 564 |
|
| 565 |
if ($type == 'sunrise') {
|
| 566 |
$diurnal_arc = $pi_20 - $diurnal_arc;
|
| 567 |
}
|
| 568 |
|
| 569 |
// calculate the time
|
| 570 |
$localtime = $diurnal_arc + $sra - 0.0172028 * $a - 1.73364;
|
| 571 |
// wall clock time
|
| 572 |
$wallclock = $localtime - $longitude + $timezone;
|
| 573 |
|
| 574 |
// normalize wallclock to be between >= 0 and < 2.0*pi
|
| 575 |
while ($wallclock < 0) {
|
| 576 |
$wallclock += $pi_20;
|
| 577 |
}
|
| 578 |
while ($wallclock >= $pi_20) {
|
| 579 |
$wallclock -= $pi_20;
|
| 580 |
}
|
| 581 |
$wallclock = $wallclock * 3.81972;
|
| 582 |
|
| 583 |
$hour = intval($wallclock);
|
| 584 |
$minute = round(($wallclock - $hour) * 60, 0);
|
| 585 |
|
| 586 |
if ($type == 'sunrise') {
|
| 587 |
$sunrise = gmmktime($hour, $minute, 0, $month, $day, $year);
|
| 588 |
}
|
| 589 |
else {
|
| 590 |
$sunset = gmmktime($hour, $minute, 0, $month, $day, $year);
|
| 591 |
}
|
| 592 |
}
|
| 593 |
|
| 594 |
// handle special cases like no sunrise / sunset at all
|
| 595 |
if (isset($no_sunset)) {
|
| 596 |
$condition = 'day';
|
| 597 |
}
|
| 598 |
else if (isset($no_sunrise)) {
|
| 599 |
$condition = 'night';
|
| 600 |
}
|
| 601 |
else {
|
| 602 |
// correctly handle northern and southern hemisphere
|
| 603 |
if ($sunrise <= $sunset) {
|
| 604 |
// this should be on the northern hemisphere
|
| 605 |
if ($metar['reported_on'] >= $sunrise and $metar['reported_on'] < $sunset) {
|
| 606 |
$condition = 'day';
|
| 607 |
}
|
| 608 |
else {
|
| 609 |
$condition = 'night';
|
| 610 |
}
|
| 611 |
}
|
| 612 |
else {
|
| 613 |
// this should be on the southern hemisphere
|
| 614 |
if ($metar['reported_on'] >= $sunrise or $metar['reported_on'] <= $sunset) {
|
| 615 |
$condition = 'day';
|
| 616 |
}
|
| 617 |
else {
|
| 618 |
$condition = 'night';
|
| 619 |
}
|
| 620 |
}
|
| 621 |
}
|
| 622 |
|
| 623 |
$metar['daytime']['sunrise_on'] = $sunrise;
|
| 624 |
$metar['daytime']['sunset_on'] = $sunset;
|
| 625 |
if (isset($no_sunrise)) {
|
| 626 |
$metar['daytime']['no_sunrise'] = TRUE;
|
| 627 |
}
|
| 628 |
else {
|
| 629 |
$metar['daytime']['no_sunrise'] = FALSE;
|
| 630 |
}
|
| 631 |
if (isset($no_sunset)) {
|
| 632 |
$metar['daytime']['no_sunset'] = TRUE;
|
| 633 |
}
|
| 634 |
else {
|
| 635 |
$metar['daytime']['no_sunset'] = FALSE;
|
| 636 |
}
|
| 637 |
$metar['daytime']['condition'] = $condition;
|
| 638 |
}
|
| 639 |
|
| 640 |
|
| 641 |
|
| 642 |
/**
|
| 643 |
* Calculate Beaufort wind scale for given wind speed
|
| 644 |
*
|
| 645 |
* @link http://en.wikipedia.org/wiki/Beaufort_scale
|
| 646 |
*
|
| 647 |
* @param float Wind speed in km/h
|
| 648 |
* @return Beaufort number
|
| 649 |
*/
|
| 650 |
function _weather_calculate_beaufort($wind_speed) {
|
| 651 |
if ($wind_speed >= 120) return 12;
|
| 652 |
if ($wind_speed >= 103) return 11;
|
| 653 |
if ($wind_speed >= 88) return 10;
|
| 654 |
if ($wind_speed >= 76) return 9;
|
| 655 |
if ($wind_speed >= 63) return 8;
|
| 656 |
if ($wind_speed >= 51) return 7;
|
| 657 |
if ($wind_speed >= 40) return 6;
|
| 658 |
if ($wind_speed >= 30) return 5;
|
| 659 |
if ($wind_speed >= 20) return 4;
|
| 660 |
if ($wind_speed >= 12) return 3;
|
| 661 |
if ($wind_speed >= 7) return 2;
|
| 662 |
if ($wind_speed >= 1) return 1;
|
| 663 |
return 0;
|
| 664 |
}
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