/**
* Convert this LatLng object into an OSGB grid reference. Note that this
* function does not take into account the bounds of the OSGB grid -
* beyond the bounds of the OSGB grid, the resulting OSRef object has no
* meaning
*
* Reference values for transformation are taken from OS document
* "A Guide to Coordinate Systems in Great Britain"
*
* @return OSRef
*/
public function toOSRef()
{
if ($this->refEll != RefEll::Airy1830()) {
trigger_error('Current co-ordinates are in a non-OSGB datum', E_USER_WARNING);
}
$OSGB = new OSRef(0, 0);
//dummy to get reference data
$scale = $OSGB->getScaleFactor();
$N0 = $OSGB->getOriginNorthing();
$E0 = $OSGB->getOriginEasting();
$phi0 = $OSGB->getOriginLatitude();
$lambda0 = $OSGB->getOriginLongitude();
$coords = $this->toTransverseMercatorEastingNorthing($scale, $E0, $N0, $phi0, $lambda0);
return new OSRef($coords['E'], $coords['N']);
}
/**
* @expectedException \PHPUnit_Framework_Error_Warning
*/
public function testDistanceDifferentEllipsoids()
{
$work = new LatLng(51.54105, -0.12319, RefEll::Airy1830());
$charingCross = new LatLng(51.507977, -0.124588, RefEll::WGS84());
$expected = 3678.49665;
self::assertEquals($expected, $work->distance($charingCross));
}
public function getReferenceEllipsoid()
{
return RefEll::Airy1830();
}