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MGeo.php
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MGeo.php
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<?php
/**
* M PHP Framework
*
* @package M
* @subpackage MGeo
* @author Arnaud Sellenet <demental at github>
* @license http://opensource.org/licenses/lgpl-license.php GNU Lesser General Public License
* @version 0.1
*/
define('PI',3.1415926536);
/**
*
* Helper class to work with google maps geocoding API
* Also provides helper methods for satellite settings (azimut - elevation - polarity)
*
*/
class MGeo
{
/**
*
* Address
*
* @var string
* @access public
*/
public $address;
/**
*
* Google maps key
*
* @var string
* @access public
*/
public $key;
/**
*
* Constructor
*
* @param $key string Google maps key
*/
public function __construct($key = null)
{
if(is_null($key)) {
$this->key = Config::getPref('gmap_key');
} else {
$this->key = $key;
}
}
/**
*
* Address validation
*
* @param $address string Input address
*/
public function setAddress($address)
{
/* foreach(array('street','city','zipcode','country') as $k) {
if(!key_exists($k,$address)) {
throw new Exception('Bad address format for Geo object');
}
}*/
$this->address = $address;
}
/**
*
* Set debug var
*
* @param $bool boolean Debug state
*/
public function setDebug($bool)
{
$this->_debug=$bool;
}
/**
*
* Display debug
*
* @param $str string Debug string
*/
public function debug($str)
{
echo $str.'<br />';
}
/**
*
* Set string to var
*
* @param $str string String to set
*/
public function setString($str)
{
$this->q = $str;
}
/**
*
* Set Latitude & Longitude
*
* @param $lat string Latitude
* @param $long string Longitude
*/
public function setLatLong($lat,$long)
{
$this->lat = $lat;
$this->long = $long;
}
/**
*
* Get Latitude & Longitude
*
* @return array Latitude & Longitude
*/
public function getLatLong()
{
if(empty($this->q)) {
$this->q = (trim($this->address['street'])?$this->address['street'].', ':'').$this->address['city'].', '.$this->address['zipcode'].', '.$this->address['country'];
}
if($this->_debug) {
$this->debug('fetching : '.$this->q);
}
$url = "https://maps.google.com/maps/api/geocode/json?address=".urlencode($this->q)."&sensor=false";
if($this->_debug) {
$this->debug('url : '.$url);
}
$coords = json_decode(file_get_contents($url));
if($this->_debug) {
$this->debug('result : '.$coords);
}
$result = $coords->results[0]->geometry->location;
$lat = $result->lat;
$long = $result->lng;
return array($lat,$long);
}
/**
*
* Azimut Elevation Polarite
*
* @param $satlong float Sat degree
* @return array Azimut Elevation Polarite
*/
public function getAEP($satlong = 13)
{
$rayon=6378000;
$sat_alt=35786000;
$this->azimut = $this->calculAzimut($satlong,$this->lat,$this->long);//180+180*atan(-1*tan(PI*($po-$long)/180)/sin(PI*$lat/180))/PI;
$el=acos(cos(PI/180*($this->long-$satlong))*cos(PI/180*abs($this->lat)));
$this->elevation=180*atan((cos($el)-($rayon/($rayon+$sat_alt)))/sin($el))/PI;
$longdiffr=(13-$this->long)/57.29578;
$eslatr=$this->lat/57.29578;
$tilt=-57.29578*atan(sin($longdiffr)/tan($eslatr));
$this->polarite=$tilt;
return array($this->azimut,$this->elevation,$this->polarite);
}
/**
*
* Azimut calculation
*
* @param $satlong string Longitude Satellite
* @param $eslat string Latitude
* @param $eslong string Longitude
* @return string Azimut
*/
private function calculAzimut($satlong,$eslat,$eslong)
{
$longdiffr=($eslong-$satlong)/57.29578;
$esazimuth=180+57.29578*atan(tan($longdiffr)/sin(($eslat/57.29578)));
if ($eslat<0) $esazimuth=$esazimuth-180;
if ($esazimuth<0) $esazimuth=$esazimuth+360.0;
//magnetic field model
//table below updated 17 Apr 2006, centered on 17 April 2007, needs updating in Apr 2008 to keep errors under 0.2 deg
$dev[0]=4.58; $dev[1]=7.21; $dev[2]=9.58; $dev[3]=16.48; $dev[4]=46.03;
$dev[5]=19.52; $dev[6]=12.2; $dev[7]=9.28; $dev[8]=17.25; $dev[9]=42.62;
$dev[10]=21.9; $dev[11]=12.42; $dev[12]=9.13; $dev[13]=16.83; $dev[14]=38.92;
$dev[15]=-8.28; $dev[16]=0.33; $dev[17]=4.61; $dev[18]=13.92; $dev[19]=28.95;
$dev[20]=-28.45; $dev[21]=-16.08; $dev[22]=-14.6; $dev[23]=-8.15; $dev[24]=10.55;
$dev[25]=-18.72; $dev[26]=-11.45; $dev[27]=-18.7; $dev[28]=-24.13; $dev[29]=-5.7;
$dev[30]=-3.5; $dev[31]=-0.98; $dev[32]=-6.43; $dev[33]=-23.5; $dev[34]=-19.32;
$dev[35]=9.12; $dev[36]=3.32; $dev[37]=0.63; $dev[38]=-23.92; $dev[39]=-39.95;
$dev[40]=16.42; $dev[41]=2.18; $dev[42]=-4.15; $dev[43]=-32.12; $dev[44]=-60.65;
$dev[45]=7.9; $dev[46]=0.02; $dev[47]=-2.48; $dev[48]=-18.33; $dev[49]=-73.8;
$dev[50]=-12.8; $dev[51]=-4.8; $dev[52]=1.08; $dev[53]=-0.77; $dev[54]=-62.3;
$dev[55]=-11.35; $dev[56]=-2.65; $dev[57]=5.5; $dev[58]=11; $dev[59]=39.35;
$dev[60]=4.58; $dev[61]=7.21; $dev[62]=9.58; $dev[63]=16.48; $dev[64]=46.03;
$latit=1.0*$eslat;
$longi=1.0*$eslong;
if ($latit==60.0) $latit=59.99999;
if ($latit >59.999999) return $esazimuth+1000;
if ($latit <-60) return $esazimuth+1000;
if ($longi==180.0) $longi=179.99999;
if ($longi>179.999999) $longi=$longi-360;
if ($longi<-180) $longi=$longi+360;
$a = round(((1.0*$longi + 180)/30)-0.5);
$b = 3- round(((1.0*$latit + 60)/30)-0.5);
$c=$a * 5 + $b;
//calculate left proportion up to 30.
if ($latit>=30) $pl=$latit-30;
else
if($latit>=0) $pl=$latit;
else
if ($latit>=-30) $pl=30+$latit;
else
$pl = 60+$latit;
//calculate hoziz proportion up to 30.
$pr=$longi +180 - $a*30;
//return pr; ok to here
$u1=$dev[$c+1]+($dev[$c]-$dev[$c+1])*$pl/30;
$u2=$dev[$c+6]+($dev[$c+5]-$dev[$c+6])*$pl/30;
$um=$u1+($u2-$u1)*$pr/30;
//return um;
$esazimuthm=$esazimuth-$um;
if ($esazimuthm<-180) $esazimuthm=$esazimuthm+360;
if ($esazimuthm>360) $esazimuthm=$esazimuthm-360.0;
return $esazimuthm;
}
}