ossimSrtmFactory Class Reference

the elevation manager, this class returns an ossimSrtmElevSource given a ground point and some directory with srtm files in it. More...

#include <ossimSrtmFactory.h>

Inheritance diagram for ossimSrtmFactory:

Public Member Functions
	ossimSrtmFactory ()
	default constructor More...
	ossimSrtmFactory (const ossimFilename &dir)
	Constructor that takes a directory name. More...
virtual	~ossimSrtmFactory ()
	destructor More...
virtual ossimElevSource *	getNewElevSource (const ossimGpt &gpt) const
	Open the appropriate ossimSrtmElevSource that covers given a ground point. More...
Public Member Functions inherited from ossimElevSourceFactory
	ossimElevSourceFactory ()
	default constructor More...
virtual	~ossimElevSourceFactory ()
	virtual destructor More...
virtual ossimFilename	getDirectory () const
virtual void	setDirectory (const ossimFilename &directory)
Public Member Functions inherited from ossimObject
	ossimObject ()
virtual	~ossimObject ()
virtual ossimObject *	dup () const
virtual ossimString	getShortName () const
virtual ossimString	getLongName () const
virtual ossimString	getDescription () const
virtual ossimString	getClassName () const
virtual RTTItypeid	getType () const
virtual bool	canCastTo (ossimObject *obj) const
virtual bool	canCastTo (const RTTItypeid &id) const
virtual bool	canCastTo (const ossimString &parentClassName) const
virtual bool	saveState (ossimKeywordlist &kwl, const char *prefix=0) const
virtual bool	loadState (const ossimKeywordlist &kwl, const char *prefix=0)
virtual std::ostream &	print (std::ostream &out) const
	Generic print method. More...
virtual bool	isEqualTo (const ossimObject &obj, ossimCompareType compareType=OSSIM_COMPARE_FULL) const
virtual void	accept (ossimVisitor &visitor)
Public Member Functions inherited from ossimReferenced
	ossimReferenced ()
	ossimReferenced (const ossimReferenced &)
ossimReferenced &	operator= (const ossimReferenced &)
void	ref () const
	increment the reference count by one, indicating that this object has another pointer which is referencing it. More...
void	unref () const
	decrement the reference count by one, indicating that a pointer to this object is referencing it. More...
void	unref_nodelete () const
	decrement the reference count by one, indicating that a pointer to this object is referencing it. More...
int	referenceCount () const

Additional Inherited Members
Protected Member Functions inherited from ossimReferenced
virtual	~ossimReferenced ()
Protected Attributes inherited from ossimElevSourceFactory
ossimFilename	theDirectory

Detailed Description

the elevation manager, this class returns an ossimSrtmElevSource given a ground point and some directory with srtm files in it.

Definition at line 27 of file ossimSrtmFactory.h.

Constructor & Destructor Documentation

ossimSrtmFactory() [1/2]

ossimSrtmFactory::ossimSrtmFactory

(

)

default constructor

Definition at line 34 of file ossimSrtmFactory.cpp.

   : ossimElevSourceFactory()
{}

ossimSrtmFactory() [2/2]

ossimSrtmFactory::ossimSrtmFactory

(

const ossimFilename &

dir

)

Constructor that takes a directory name.

Definition at line 38 of file ossimSrtmFactory.cpp.

References ossimElevSourceFactory::theDirectory.

   : ossimElevSourceFactory()
{
   theDirectory = dir;
}

~ossimSrtmFactory()

ossimSrtmFactory::~ossimSrtmFactory ( )

virtual

destructor

Definition at line 44 of file ossimSrtmFactory.cpp.

{}

Member Function Documentation

getNewElevSource()

ossimElevSource * ossimSrtmFactory::getNewElevSource ( const ossimGpt &  gpt ) const

virtual

Open the appropriate ossimSrtmElevSource that covers given a ground point.

Parameters

gpt	Ground point that an elevation source is need for.

Returns

Returns a pointer to an ossimElevSource if an srtm file is found that can cover the ground point. Returns NULL if no cell is found for the point.

Implements ossimElevSourceFactory.

Definition at line 47 of file ossimSrtmFactory.cpp.

{
   
   if (traceDebug())
   {
      ossimNotify(ossimNotifyLevel_DEBUG)
         << "DEBUG ossimSrtmFactory::getNewElevSource: Entered..."
         << std::endl;
   }

   ossimRefPtr<ossimElevCellHandler> srtmPtr;

   if (theDirectory == ossimFilename::NIL)
   {
      ossimNotify(ossimNotifyLevel_FATAL)
         << "ossimSrtmFactory::getNewElevSource: "
         << "SRTM directory has not been set!"
         << "\nReturning null elevation source..."
         << std::endl;
      
      return srtmPtr.release();
   }

   //---
   // Build up a srtm file name.
   //
   // Standard for name is upper case 'N' and 'W' lower case "hgt" like:
   // N27W081.hgt
   //---
   ossimFilename srtmFileBasename;

   int ilat =  static_cast<int>(floor(gpt.latd()));
   if (ilat < 0)
   {
      srtmFileBasename = "S";
   }
   else
   {
      srtmFileBasename = "N";
   }

   ilat = abs(ilat);
   std::ostringstream  os1;
   
   os1 << std::setfill('0') << std::setw(2) <<ilat;
   
   srtmFileBasename += os1.str().c_str();

   int ilon = static_cast<int>(floor(gpt.lond()));
   
   if (ilon < 0)
   {
      srtmFileBasename += "W";
   }
   else
   {
      srtmFileBasename += "E";
   }

   ilon = abs(ilon);
   std::ostringstream  os2;
   os2 << std::setfill('0') << std::setw(3) << ilon;
   
   srtmFileBasename += os2.str().c_str();
   srtmFileBasename.setExtension(".hgt");

   ossimFilename srtmFile = theDirectory.dirCat(srtmFileBasename);

   if (traceDebug())
   {
      ossimNotify(ossimNotifyLevel_DEBUG)
         << "DEBUG ossimSrtmFactory::getNewElevSource:"
         << "\nSearching for file:  " << srtmFile
         << std::endl;
   }
   // ossimRefPtr<ossimIFStream> is = ossimStreamFactoryRegistry::instance()->
   std::shared_ptr<ossim::istream> is = ossim::StreamFactoryRegistry::instance()->
                                           createIstream(srtmFile);

   // Look for the file mix case, then all lower case, then all upper case.
   if ( is )
   {
      if(is->fail())
      {
         // Try down casing the whole thing.
         srtmFileBasename = srtmFileBasename.downcase();
         srtmFile = theDirectory.dirCat(srtmFileBasename);
         
         is = ossim::StreamFactoryRegistry::instance()->
               createIstream(srtmFile);
         if ( is )
         {
            if(is->fail())
            {
               // OK, try upcasing the whole thing.
               srtmFileBasename = srtmFileBasename.upcase();
               srtmFile = theDirectory.dirCat(srtmFileBasename);
               is = ossim::StreamFactoryRegistry::instance()->
                     createIstream(srtmFile);
            }
         }
      }
   }

   if ( is && (!is->fail()) )
   {
      is.reset();
      srtmPtr = new ossimSrtmHandler();
      if(srtmPtr->open(srtmFile)&&srtmPtr->pointHasCoverage(gpt) )
      {
         return srtmPtr.release();
      }
      else
      {
         srtmPtr = 0;
      }
   }
   return srtmPtr.release();
}

---

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

• ossimSrtmFactory.h
• ossimSrtmFactory.cpp