ossimSrtmHandler.h

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//----------------------------------------------------------------------------
//
// License:  See tope level LICENSE.txt file.
//
// Author:  David Burken
//
// Description:
// 
// Shuttle Radar Topography Mission (SRTM) elevation source.
//
//----------------------------------------------------------------------------
// $Id: ossimSrtmHandler.h 23117 2015-01-29 22:33:13Z okramer $
#ifndef ossimSrtmHandler_HEADER
#define ossimSrtmHandler_HEADER

#include <ossim/base/ossimIoStream.h>
//#include <fstream>

#include <ossim/base/ossimString.h>
#include <ossim/elevation/ossimElevCellHandler.h>
#include <ossim/support_data/ossimSrtmSupportData.h>
#include <mutex>

class ossimEndian;

class OSSIMDLLEXPORT ossimSrtmHandler : public ossimElevCellHandler
{
public:

   ossimSrtmHandler();
   ossimSrtmHandler(const ossimSrtmHandler&);


   enum
   {
      NULL_POST = -32768 // Fixed by SRTM specification.
   };

   virtual double getHeightAboveMSL(const ossimGpt&);

   virtual ossimIpt getSizeOfElevCell() const;
      
   virtual double getPostValue(const ossimIpt& gridPt) const;

   virtual bool isOpen()const;
   
   virtual bool open(const ossimFilename& file, bool memoryMapFlag=false);

   virtual void close();
   
   virtual ossimObject* dup() const
   {
      ossimSrtmHandler* obj = new ossimSrtmHandler();
      obj->open(theFilename, (m_memoryMap.size() != 0));
      return obj;
   }

protected:
   virtual ~ossimSrtmHandler();
   ossimSrtmSupportData m_supportData;
   mutable std::mutex m_fileStrMutex;
   std::ifstream m_fileStr;

   bool          m_streamOpen;
   
   ossim_int32      m_numberOfLines;
   ossim_int32      m_numberOfSamples;
   ossim_int32      m_srtmRecordSizeInBytes;
   double           m_latSpacing;   // degrees
   double           m_lonSpacing;   // degrees
   ossimDpt         m_nwCornerPost; // cell origin;
   ossimEndian*     m_swapper;
   ossimScalarType  m_scalarType;
   
   mutable std::vector<ossim_int8> m_memoryMap;
   
   template <class T>
   double getHeightAboveMSLFileTemplate(T dummy, const ossimGpt& gpt);
   template <class T>
   double getHeightAboveMSLMemoryTemplate(T dummy, const ossimGpt& gpt);
   TYPE_DATA
};

#endif /* End of "#ifndef ossimSrtmHandler_HEADER" */