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MvLocation.cc

// MvLocation.cc,     vk 940901...
//                rev vk 011025

// classes:  MvLocation, MvArea, MvXSectionLine


#include <math.h>
//#include "Metview.h"
#include "MvLocation.h"

//_____________________________________________________________________ set
void
00013 MvLocation :: set( double aLat, double aLong )
{
/*--- to check or not to check: XSection computes values outside the real world!!!
   if( aLat != MISSING_LOC_VALUE && ( aLat > 90. || aLat < -90. ) )
   {
     cerr << " >>> MvLocation::MvLocation: strange latitude value " << aLat << endl;
     fLatitude = MISSING_LOC_VALUE;
   }
   else
---*/
   fLatitude = aLat;

/*---
   if( aLong != MISSING_LOC_VALUE && ( aLong > 360. || aLong < -360. ) )
   {
     cerr << " >>> MvLocation::MvLocation: strange longitude value " << aLong << endl;
     fLongitude = MISSING_LOC_VALUE;
   }
   else
---*/
   fLongitude = aLong;
}

//______________________________________________________________ distanceInRadians
double
00038 MvLocation :: distanceInRadians( const MvLocation& anOtherLocation ) const
{
   const double cDEG2RAD = M_PI / 180.0;

   double lat1 = latitude() * cDEG2RAD;
   double lat2 = anOtherLocation.latitude() * cDEG2RAD;
   double lon1 = longitude() * cDEG2RAD;
   double lon2 = anOtherLocation.longitude() * cDEG2RAD;

   //-- from: http://williams.best.vwh.net/avform.htm (020815/vk) --
   double d = acos(sin(lat1)*sin(lat2)+cos(lat1)*cos(lat2)*cos(lon1-lon2));

   return d;
}

//_____________________________________________________________ distanceInDegrees
double
00055 MvLocation :: distanceInDegrees( const MvLocation& anOtherLocation ) const
{
   return distanceInRadians( anOtherLocation ) * 180.0 / M_PI;
}

//_____________________________________________________________ distanceInMeters
double
00062 MvLocation :: distanceInMeters( const MvLocation& anOtherLocation ) const
{
  const double cR2NM = 180.0*60.0/M_PI;  //-- radians -> nautical miles
  const double cNM2M = 1852;             //-- nautical miles -> metres

  double nm = distanceInRadians( anOtherLocation ) * cR2NM;
  return nm * cNM2M;;
}

//_____________________________________________________________ operator=
MvLocation&
00073 MvLocation :: operator= ( const MvLocation& aLoc )
{
   set( aLoc.latitude(), aLoc.longitude() );
   return *this;
}
//_____________________________________________________________ operator<<

00080 ostream& operator<< ( ostream& aStream, const MvLocation& aLocation )
{
   aStream << "(" << aLocation.latitude() << "," << aLocation.longitude() << ")";
/*--- How to get a constant field width + constant nr of decimal digits!?
   aStream << "(";
   aStream.width( 6 ); aStream.fill( ' ' );
   aStream << aLocation.latitude() << ",";
   aStream.width( 7 ); aStream.fill( ' ' );
   aStream << aLocation.longitude() << ")";
---*/
   return aStream;
}

//____________________________________________________________________________
//============================================================================ MvArea
//____________________________________________________________________________

MvArea :: MvArea( void )
{
   MvLocation myLocation;
   set( myLocation, myLocation );
}
//____________________________________________________________________

void
MvArea :: set( const MvLocation& aLocation1, const MvLocation& aLocation2 )
{
   double y1 = aLocation1.latitude();
   double x1 = aLocation1.longitude();
   double y2 = aLocation2.latitude();
   double x2 = aLocation2.longitude();
   if( y1 > y2 )
   {
      double yy = y1; y1 = y2; y2 = yy;
   }
   if( x1 > x2 )
   {
      double xx = x1; x1 = x2; x2 = xx;
   }
   fLowerLeft.set( y1, x1 );
   fUpperRight.set( y2, x2 );
}
//____________________________________________________________________

bool
MvArea :: inside( const MvLocation& aPoint ) const
{
   if( aPoint.latitude() >= fLowerLeft.latitude() &&
       aPoint.latitude() <= fUpperRight.latitude() &&
       aPoint.longitude() >= fLowerLeft.longitude() &&
       aPoint.longitude() <= fUpperRight.longitude()
      )
     return true;
   else
     return false;
}
//____________________________________________________________________

MvArea&
MvArea :: operator= ( const MvArea& anArea )
{
   set( anArea.lowerLeft(), anArea.upperRight() );
   return *this;
}
//____________________________________________________________________

ostream& operator<< ( ostream& aStream, const MvArea& anArea )
{
   aStream << anArea.lowerLeft() << "-" << anArea.upperRight();
   return aStream;
}

//______________________________________________________________________
//====================================================================== MvXSectionLine
//______________________________________________________________________

//_____________________________________________________________ WithinDelta
bool
00158 MvXSectionLine :: withinDelta( const MvLocation& aLocation ) const
{
   //-- check that max delta has been set
   if( fMaxDeltaInMeters < 0 )
      return false;

   //-- check distance from the line going through end points
   if( deltaInMeters( aLocation ) > fMaxDeltaInMeters )
      return false;

   //--- check that the distance is from the line between end points
   return insideXLine( aLocation );
}
//_____________________________________________________________ InsideXLine
bool
00173 MvXSectionLine :: insideXLine( const MvLocation& aLocation ) const
{
   MvLocation myLocation = nearestPointOnXLine( aLocation );
   MvArea myArea( fLocation1, fLocation2 );
   return myArea.inside( myLocation );
}
//_____________________________________________________________ NearestPointOnXLine
// Q&D approximation for distance of a point from an XSection
// line, in degrees true at equator...
//--------
// WARNING: calculates distance from a line going through end
//          points of XSectionLine, NOT ONLY between points!
//-------------------------------------------------------------
MvLocation
00187 MvXSectionLine :: nearestPointOnXLine( const MvLocation& aLocation ) const
{
   MvLocation myNearestPointOnXLine;

   double dy = fLocation1.latitude() - fLocation2.latitude();
   double dx = fLocation1.longitude() - fLocation2.longitude();

   if( dx == 0 )            //-- vertical line --
   {
      myNearestPointOnXLine.set( aLocation.latitude(), fLocation1.longitude() );
   }
   else if( dy == 0 )       //-- horizontal line --
      {
         myNearestPointOnXLine.set( fLocation1.latitude(), aLocation.longitude() );
      }
      else                  //-- just a line --
      {
         // calculate coefficients for the Xsection line: y=a1*x+b1
         double a1 = dy / dx;
         double b1 = fLocation1.latitude() - a1 * fLocation1.longitude();

         // define perpendicular line thru aLocation: y=a2*x+b2
         double a2 = - 1. / a1;
         double b2 = aLocation.latitude() - a2 * aLocation.longitude();

         double x = ( b2 - b1 ) / ( a1 - a2 );
         double y = a1 * x + b1;
         myNearestPointOnXLine.set( y, x );
      }

   //-- WARNING: does not check that nearest point is inside XSectionLine !!!!
   return  myNearestPointOnXLine;
}
//_____________________________________________________________ DeltaInDegrees
double
00222 MvXSectionLine :: deltaInDegrees( const MvLocation& aLocation ) const
{
   return aLocation.distanceInDegrees( nearestPointOnXLine( aLocation ) );
}
//_____________________________________________________________ DeltaInMeters
// Q&D approximation for delta, uses DeltaInDegrees
//-------------------------------------------------------------
double
00230 MvXSectionLine :: deltaInMeters( const MvLocation& aLocation ) const
{
   //-- Q&D formula, out of my old used brains, unchecked!!!! (vk 940901) --
   double degreeIntoMeters = 6370.*1000. * 2. * M_PI / 360.;
   return deltaInDegrees( aLocation ) * degreeIntoMeters;
}
//_____________________________________________________________ operator=
MvXSectionLine&
00238 MvXSectionLine :: operator= ( const MvXSectionLine& anXLine )
{
   setLine( anXLine.startPoint(), anXLine.endPoint() );
   setMaxDelta( anXLine.maxDelta() );
   return *this;
}
//_____________________________________________________________ operator<<
// output format: "(lat1,long1)-(lat2,long2)/delta"
//-------------------------------------------------

ostream& operator<< ( ostream& aStream, const MvXSectionLine& anXLine )
{
   aStream << anXLine.startPoint() << "-" << anXLine.endPoint()
           << "/" << anXLine.fMaxDeltaInMeters; // << endl;
   return aStream;
}


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