RinexObsFilterOperators.hpp

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//==============================================================================
//
//  This file is part of GNSSTk, the ARL:UT GNSS Toolkit.
//
//  The GNSSTk is free software; you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published
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//
//  You should have received a copy of the GNU Lesser General Public
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//  Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
//
//  This software was developed by Applied Research Laboratories at the
//  University of Texas at Austin.
//  Copyright 2004-2022, The Board of Regents of The University of Texas System
//
//==============================================================================
 
//==============================================================================
//
//  This software was developed by Applied Research Laboratories at the
//  University of Texas at Austin, under contract to an agency or agencies
//  within the U.S. Department of Defense. The U.S. Government retains all
//  rights to use, duplicate, distribute, disclose, or release this software.
//
//  Pursuant to DoD Directive 523024
//
//  DISTRIBUTION STATEMENT A: This software has been approved for public
//                            release, distribution is unlimited.
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//==============================================================================
 
#ifndef GNSSTK_RINEXOBSFILTEROPERATORS_HPP
#define GNSSTK_RINEXOBSFILTEROPERATORS_HPP
 
#include "FileFilter.hpp"
#include "RinexObsData.hpp"
#include "RinexObsHeader.hpp"
 
#include <set>
#include <algorithm>
 
namespace gnsstk
{
 
 
   struct RinexObsDataOperatorLessThanFull :
      public std::binary_function<gnsstk::RinexObsData,
                                  gnsstk::RinexObsData, bool>
   {
   public:
      RinexObsDataOperatorLessThanFull
      (const std::set<gnsstk::RinexObsType>& rohset)
            : obsSet(rohset)
      {}
 
      bool operator()(const gnsstk::RinexObsData& l,
                      const gnsstk::RinexObsData& r) const
      {
            // compare the times, offsets, then only those elements
            // that are common to both.  this ignores the flags
            // that are set to 0
         if (l.time < r.time)
            return true;
         else if (l.time == r.time)
         {
            if (l.epochFlag < r.epochFlag)
               return true;
            else if (l.epochFlag == r.epochFlag)
            {
               if (l.clockOffset < r.clockOffset)
                  return true;
               else if (l.clockOffset > r.clockOffset)
                  return false;
            }
            else
               return false;
         }
         else
            return false;
 
            // for the obs, first check that they're the same size
            // i.e. - contain the same number of PRNs
         if (l.obs.size() < r.obs.size())
            return true;
 
         if (l.obs.size() > r.obs.size())
            return false;
 
            // then check that each PRN has the same data for each of the
            // shared fields
         gnsstk::RinexObsData::RinexSatMap::const_iterator lItr =
            l.obs.begin(), rItr;
 
         gnsstk::SatID sat;
 
         while (lItr != l.obs.end())
         {
            sat = (*lItr).first;
            rItr = r.obs.find(sat);
            if (rItr == r.obs.end())
               return false;
 
            gnsstk::RinexObsData::RinexObsTypeMap
               lObs = (*lItr).second,
               rObs = (*rItr).second;
 
            std::set<gnsstk::RinexObsType>::const_iterator obsItr =
               obsSet.begin();
 
            while (obsItr != obsSet.end())
            {
               gnsstk::RinexDatum lData, rData;
               lData = lObs[*obsItr];
               rData = rObs[*obsItr];
 
               if (lData.data < rData.data)
                  return true;
 
               if ( (lData.lli != 0) && (rData.lli != 0) )
                  if (lData.lli < rData.lli)
                     return true;
 
               if ( (lData.ssi != 0) && (rData.ssi != 0) )
                  if (lData.ssi < rData.ssi)
                     return true;
 
               obsItr++;
            }
 
            lItr++;
         }
 
            // the data is either == or > at this point
         return false;
      }
 
   private:
      std::set<gnsstk::RinexObsType> obsSet;
   };
 
   struct RinexObsDataOperatorLessThanSimple :
      public std::binary_function<gnsstk::RinexObsData,
                                  gnsstk::RinexObsData, bool>
   {
   public:
      bool operator()(const gnsstk::RinexObsData& l,
                      const gnsstk::RinexObsData& r) const
      {
         if (l.time < r.time)
            return true;
         return false;
      }
   };
 
   struct RinexObsDataOperatorEqualsSimple :
      public std::binary_function<gnsstk::RinexObsData,
                                  gnsstk::RinexObsData, bool>
   {
   public:
      bool operator()(const gnsstk::RinexObsData& l,
                      const gnsstk::RinexObsData& r) const
      {
         if (l.time == r.time)
            return true;
         return false;
      }
   };
 
   struct RinexObsHeaderTouchHeaderMerge :
      public std::unary_function<gnsstk::RinexObsHeader, bool>
   {
   public:
      RinexObsHeaderTouchHeaderMerge()
            : firstHeader(true)
      {}
 
      bool operator()(const gnsstk::RinexObsHeader& l)
      {
         if (firstHeader)
         {
            theHeader = l;
            firstHeader = false;
         }
         else
         {
            std::set<gnsstk::RinexObsType> thisObsSet,
               tempObsSet;
            std::set<std::string> commentSet;
            obsSet.clear();
 
               // insert the comments to the set
               // and let the set take care of uniqueness
            copy(theHeader.commentList.begin(),
                 theHeader.commentList.end(),
                 inserter(commentSet, commentSet.begin()));
            copy(l.commentList.begin(),
                 l.commentList.end(),
                 inserter(commentSet, commentSet.begin()));
               // then copy the comments back into theHeader
            theHeader.commentList.clear();
            copy(commentSet.begin(), commentSet.end(),
                 inserter(theHeader.commentList,
                          theHeader.commentList.begin()));
 
               // find the set intersection of the obs types
            copy(theHeader.obsTypeList.begin(),
                 theHeader.obsTypeList.end(),
                 inserter(thisObsSet, thisObsSet.begin()));
            copy(l.obsTypeList.begin(),
                 l.obsTypeList.end(),
                 inserter(tempObsSet, tempObsSet.begin()));
            set_intersection(thisObsSet.begin(), thisObsSet.end(),
                             tempObsSet.begin(), tempObsSet.end(),
                             inserter(obsSet, obsSet.begin()));
               // then copy the obsTypes back into theHeader
            theHeader.obsTypeList.clear();
            copy(obsSet.begin(), obsSet.end(),
                 inserter(theHeader.obsTypeList,
                          theHeader.obsTypeList.begin()));
         }
         return true;
      }
 
      bool firstHeader;
      gnsstk::RinexObsHeader theHeader;
      std::set<gnsstk::RinexObsType> obsSet;
   };
 
 
}
 
 
#endif