mapDatum.h

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/*******************************************************************************
** Copyright (c) 1992-2010 VT MAK
** All rights reserved.
*******************************************************************************/


#ifndef DtMapDatum_H_
#define DtMapDatum_H_

#include <vlutil/vlMachineTypes.h>


#ifdef DtUSE_UTILITIES_NAMESPACE
namespace DtUSE_UTILITIES_NAMESPACE
{
#endif

class DT_DLL_MATRIX DtSpheroid
{
public:

   DtFloat64 semiMajor;   

   DtFloat64 semiMinor;   
};

class DT_DLL_MATRIX DtMapDatum
{
public:

   DtMapDatum();

   DtMapDatum(const DtSpheroid& s, DtFloat64 x, DtFloat64 y, DtFloat64 z );

   DtMapDatum( const DtMapDatum& src );

   ~DtMapDatum();

   DtMapDatum& operator=( const DtMapDatum& src );

   //WARNING: compares floating point values
   int operator==( const DtMapDatum& rhs ) const;

   int operator!=( const DtMapDatum& rhs ) const;

   DtSpheroid spheroid;
   DtFloat64 datumShift[3]; 
};


const DtSpheroid DtWGS84Spheroid = { 6378137.0, 6356752.3142 };

const DtSpheroid DtInternationalSpheroid = { 6378388.0, 6356911.946127 };
const DtSpheroid DtClark1866Spheroid = { 6378206.4, 6356583.8 };

const DtMapDatum DtWGS84( DtWGS84Spheroid, 0.0, 0.0, 0.0 );
const DtMapDatum DtED50( DtInternationalSpheroid, -87.0, -98.0, -121.0 );
const DtMapDatum DtNASANAD27(  DtClark1866Spheroid, -8.0, 161.0,  179.0 );
const DtMapDatum DtNASBNAD27(  DtClark1866Spheroid, -8.0, 159.0,  175.0 );
const DtMapDatum DtCONUSNAD27( DtClark1866Spheroid, -8.0, 160.0,  176.0 );

DT_DLL_MATRIX void DtUseMapDatum( const DtMapDatum& md );

DT_DLL_MATRIX const DtMapDatum& DtCurrentMapDatum();

#ifdef DtUSE_UTILITIES_NAMESPACE
}
#endif

#endif   //! DtMapDatum_H_