#ifndef FIND_REFERENCE_ALT_LAT_LON_06_04_2007   
#define FIND_REFERENCE_ALT_LAT_LON_06_04_2007
/**
    @class FindRefAltLatLon.h
    @author Brian Magill
    @creation date 6/4/2007

	$Date:$
    $Revision:$

    @copyright
     (©) Copyright 2006 by GATS Inc.
     11864 Canon Blvd., Suite 101, Newport News, VA 23606

     All Rights Reserved. No part of this software or publication may be
     reproduced, stored in a retrieval system, or transmitted, in any form
     or by any means, electronic, mechanical, photocopying, recording, or
     otherwise without the prior written permission of GATS Inc.
        
    @brief Finds the latitude and longitude at the 83 km tangent altitude
    
    In pair object, first item is the latitude and the second is the longitude
*/

#include <valarray>
#include <utility>

class FindRefAltLatLon {

private:

    double altRef;

public:

    FindRefAltLatLon(double alt = 83.0):altRef(alt) { }

    FindRefAltLatLon(const FindRefAltLatLon &rhs):altRef(rhs.altRef) { }

    FindRefAltLatLon & operator = (const FindRefAltLatLon &rhs)
        {
         if(&rhs == this)
             return *this;
         
         altRef = rhs.altRef;
         return *this;                
         };
        
    ~FindRefAltLatLon() { }

    std::pair <double, double> operator() (std::valarray<double> const &tanAlt, 
                                            std::valarray<double> const &tanLat,
                                            std::valarray<double> const &tanLon) const;
                    
};

#endif