/**
* Convert a WGS84 latitude and longitude to an UTM reference
*
* Reference values for transformation are taken from OS document
* "A Guide to Coordinate Systems in Great Britain"
* @return UTMRef
*/
public function toUTMRef()
{
$this->toWGS84();
$longitudeZone = (int) (($this->lng + 180) / 6) + 1;
// Special zone for Norway
if ($this->lat >= 56 && $this->lat < 64 && $this->lng >= 3 && $this->lng < 12) {
$longitudeZone = 32;
} elseif ($this->lat >= 72 && $this->lat < 84) {
// Special zones for Svalbard
if ($this->lng >= 0 && $this->lng < 9) {
$longitudeZone = 31;
} elseif ($this->lng >= 9 && $this->lng < 21) {
$longitudeZone = 33;
} elseif ($this->lng >= 21 && $this->lng < 33) {
$longitudeZone = 35;
} elseif ($this->lng >= 33 && $this->lng < 42) {
$longitudeZone = 37;
}
}
$UTMZone = $this->getUTMLatitudeZoneLetter($this->lat);
$UTM = new UTMRef(0, 0, 0, $UTMZone, $longitudeZone);
//dummy to get reference data
$scale = $UTM->getScaleFactor();
$N0 = $UTM->getOriginNorthing();
$E0 = $UTM->getOriginEasting();
$phi0 = $UTM->getOriginLatitude();
$lambda0 = $UTM->getOriginLongitude();
$coords = $this->toTransverseMercatorEastingNorthing($scale, $E0, $N0, $phi0, $lambda0);
if ($this->lat < 0) {
$coords['N'] += 10000000;
}
return new UTMRef(round($coords['E']), round($coords['N']), $this->h, $UTMZone, $longitudeZone);
}
/**
* Convert a WGS84 latitude and longitude to an UTM reference
*
* Reference values for transformation are taken from OS document
* "A Guide to Coordinate Systems in Great Britain"
* @return UTMRef
*/
public function toUTMRef()
{
if ($this->refEll != RefEll::WGS84()) {
trigger_error('Current co-ordinates are in a non-WGS84 datum', E_USER_WARNING);
}
$longitudeZone = (int) (($this->lng + 180) / 6) + 1;
// Special zone for Norway
if ($this->lat >= 56 && $this->lat < 64 && $this->lng >= 3 && $this->lng < 12) {
$longitudeZone = 32;
}
// Special zones for Svalbard
if ($this->lat >= 72 && $this->lat < 84) {
if ($this->lng >= 0 && $this->lng < 9) {
$longitudeZone = 31;
} else {
if ($this->lng >= 9 && $this->lng < 21) {
$longitudeZone = 33;
} else {
if ($this->lng >= 21 && $this->lng < 33) {
$longitudeZone = 35;
} else {
if ($this->lng >= 33 && $this->lng < 42) {
$longitudeZone = 37;
}
}
}
}
}
$UTMZone = $this->getUTMLatitudeZoneLetter($this->lat);
$UTM = new UTMRef(0, 0, $UTMZone, $longitudeZone);
//dummy to get reference data
$scale = $UTM->getScaleFactor();
$N0 = $UTM->getOriginNorthing();
$E0 = $UTM->getOriginEasting();
$phi0 = $UTM->getOriginLatitude();
$lambda0 = $UTM->getOriginLongitude();
$coords = $this->toTransverseMercatorEastingNorthing($scale, $E0, $N0, $phi0, $lambda0);
if ($this->lat < 0) {
$coords['N'] += 10000000;
}
return new UTMRef($coords['E'], $coords['N'], $UTMZone, $longitudeZone);
}
