public function getRoughDistance($clientLng, $clientLat, $poiLng, $poiLat)
    {
        $result = abs($clientLng - $poiLng) + abs($clientLat - $poiLat);
        $this->BackyardError->log(5, "client({$clientLng}, {$clientLat}) poi({$poiLng}, {$poiLat}) roughDistance = {$result}");
        return $result;
    }
public function getRoughDistance($clientLng, $clientLat, $poiLng, $poiLat)
    {
        $result = abs($clientLng - $poiLng) + abs($clientLat - $poiLat);
        $this->BackyardError->log(5, "client({$clientLng}, {$clientLat}) poi({$poiLng}, {$poiLat}) roughDistance = {$result}");
        return $result;
    }
public function getRoughDistance ( $ clientLng , $ clientLat , $ poiLng , $ poiLat ) { $ result = abs ( $ clientLng - $ poiLng ) + abs ( $ clientLat - $ poiLat ) ; $ this -> BackyardError -> log ( 5 , "client({$clientLng}, {$clientLat}) poi({$poiLng}, {$poiLat}) roughDistance = {$result}" ) ; return $ result ; }
1 ~ 100km
@param float $clientLng
@param float $clientLat
@param float $poiLng
@param float $poiLat
@return float
1 ~ 100km