ossimNadconGridFile Class Reference

#include <ossimNadconGridFile.h>

Public Member Functions
	ossimNadconGridFile ()
	~ossimNadconGridFile ()
bool	open (const ossimFilename &file)
void	close ()
double	getShiftAtLatLon (double lat, double lon) const
bool	pointWithin (double lat, double lon) const
const ossimDrect	getBoundingRect () const
const ossimFilename &	getFilename () const
bool	getFileOkFlag () const
ossimDpt	getSpacing () const

Protected Attributes
std::ifstream	theInputFile
bool	theFileOkFlag
ossimFilename	theFilename
ossimNadconGridHeader	theHeader
ossimDrect	theBoundingRect
ossimDpt	theLatLonOrigin

Detailed Description

Definition at line 14 of file ossimNadconGridFile.h.

Constructor & Destructor Documentation

ossimNadconGridFile()

ossimNadconGridFile::ossimNadconGridFile ( )

inline

Definition at line 17 of file ossimNadconGridFile.h.

: theFileOkFlag(false) {}

~ossimNadconGridFile()

ossimNadconGridFile::~ossimNadconGridFile

(

)

Definition at line 6 of file ossimNadconGridFile.cpp.

{
   close();
}

Member Function Documentation

close()

void ossimNadconGridFile::close

(

)

Definition at line 32 of file ossimNadconGridFile.cpp.

{
   theInputFile.close();
}

getBoundingRect()

const ossimDrect ossimNadconGridFile::getBoundingRect ( ) const

inline

Definition at line 26 of file ossimNadconGridFile.h.

   {
      return theBoundingRect;
   }

getFilename()

const ossimFilename& ossimNadconGridFile::getFilename ( ) const

inline

Definition at line 31 of file ossimNadconGridFile.h.

   {
      return theFilename;
   }

getFileOkFlag()

bool ossimNadconGridFile::getFileOkFlag ( ) const

inline

Definition at line 35 of file ossimNadconGridFile.h.

Referenced by ossimNadconNarDatum::shift(), and ossimNadconNasDatum::shift().

   {
      return theFileOkFlag;
   }

getShiftAtLatLon()

double ossimNadconGridFile::getShiftAtLatLon	(	double	lat,
		double	lon
	)		const

Definition at line 37 of file ossimNadconGridFile.cpp.

References ossimEndian::getSystemEndianType(), ossim::nan(), OSSIM_LITTLE_ENDIAN, ossimEndian::swap(), x, and y.

Referenced by ossimNadconNarDatum::shift(), and ossimNadconNasDatum::shift().

{
   double result = ossim::nan();
   if(pointWithin(lat, lon))
   {
      double x = (lon - theLatLonOrigin.lon)/(double)theHeader.getDeltaX();
      double y = (lat - theLatLonOrigin.lat)/(double)theHeader.getDeltaY();

      int lat0 = (int)y;
      int lat1 = lat0 + 1;
      int lon0 = (int)x;
      int lon1 = lon0 + 1;

      int rows = theHeader.getNumberOfRows();
      int cols = theHeader.getNumberOfCols();

      if(lat1 >= rows) lat1 = lat0;
      if(lon1 >= cols) lon1 = lon0;

      double tLat = y - lat0;
      double tLon = x - lon0;

      int offset00 = lat0*theHeader.getBytesPerRow() + lon0*4 + theHeader.getStartOffset();
      int offset01 = lat0*theHeader.getBytesPerRow() + lon1*4 + theHeader.getStartOffset();
      int offset11 = lat1*theHeader.getBytesPerRow() + lon1*4 + theHeader.getStartOffset();
      int offset10 = lat1*theHeader.getBytesPerRow() + lon0*4 + theHeader.getStartOffset();
      
      
      double v00 = 0.0;
      double v01 = 0.0;
      double v11 = 0.0;
      double v10 = 0.0;
      
      theInputFile.seekg((std::streampos)offset00);
      theInputFile.read((char*)&v00, 4);
      theInputFile.seekg((std::streampos)offset01);
      theInputFile.read((char*)&v01, 4);
      theInputFile.seekg((std::streampos)offset11);
      theInputFile.read((char*)&v11, 4);
      theInputFile.seekg((std::streampos)offset10);
      theInputFile.read((char*)&v10, 4);
      ossimEndian anEndian;

      if(anEndian.getSystemEndianType() != OSSIM_LITTLE_ENDIAN)
      {
         anEndian.swap(v00);
         anEndian.swap(v01);
         anEndian.swap(v11);
         anEndian.swap(v10);
      }
      
      double top    = (double)v00 + ((double)v01 - (double)v00)*tLon;
      double bottom = (double)v10 + ((double)v11 - (double)v10)*tLon;
      
      result = top + (bottom-top)*tLat;
   }
   
   return result;
}

getSpacing()

ossimDpt ossimNadconGridFile::getSpacing ( ) const

inline

Definition at line 39 of file ossimNadconGridFile.h.

   {
      return theHeader.getSpacing();
   }

open()

bool ossimNadconGridFile::open

(

const ossimFilename &

file

)

Definition at line 11 of file ossimNadconGridFile.cpp.

References ossimString::c_str().

Referenced by ossimNadconGridDatum::checkGrid().

{
   if(theHeader.readHeader(file))
   {
      theInputFile.close();
      theInputFile.clear();
      theInputFile.open(file.c_str(), ios::in|ios::binary);

      theBoundingRect = theHeader.getBoundingRect();
      theLatLonOrigin.lat = theHeader.getMinY();
      theLatLonOrigin.lon = theHeader.getMinX();
      theFilename = file;
      theFileOkFlag = true;
      return theInputFile.good();
   }
   theFileOkFlag = false;
   theFilename   = "";

   return false;
}

pointWithin()

bool ossimNadconGridFile::pointWithin	(	double	lat,
		double	lon
	)		const

Definition at line 97 of file ossimNadconGridFile.cpp.

{
  return theBoundingRect.pointWithin(ossimDpt(lon, lat));
}

Member Data Documentation

theBoundingRect

ossimDrect ossimNadconGridFile::theBoundingRect

protected

Definition at line 49 of file ossimNadconGridFile.h.

theFilename

ossimFilename ossimNadconGridFile::theFilename

protected

Definition at line 47 of file ossimNadconGridFile.h.

theFileOkFlag

bool ossimNadconGridFile::theFileOkFlag

mutableprotected

Definition at line 46 of file ossimNadconGridFile.h.

theHeader

ossimNadconGridHeader ossimNadconGridFile::theHeader

protected

Definition at line 48 of file ossimNadconGridFile.h.

theInputFile

std::ifstream ossimNadconGridFile::theInputFile

mutableprotected

Definition at line 45 of file ossimNadconGridFile.h.

theLatLonOrigin

ossimDpt ossimNadconGridFile::theLatLonOrigin

protected

Definition at line 50 of file ossimNadconGridFile.h.

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The documentation for this class was generated from the following files:

• ossimNadconGridFile.h
• ossimNadconGridFile.cpp