ossimImageElevationHandler Class Reference

Elevation source for a generic image opened via ossimImageHandler. More...

#include <ossimImageElevationHandler.h>

Inheritance diagram for ossimImageElevationHandler:

Classes
class	TileCacheEntry

Public Member Functions
	ossimImageElevationHandler ()
	default constructor More...
	ossimImageElevationHandler (const ossimFilename &file)
virtual double	getHeightAboveMSL (const ossimGpt &)
	METHOD: getHeightAboveMSL Height access methods. More...
virtual ossimIpt	getSizeOfElevCell () const
	METHOD: getSizeOfElevCell Returns the number of post in the cell. More...
virtual double	getPostValue (const ossimIpt &gridPt) const
	METHOD: getPostValue Returns the value at a given grid point as a double. More...
virtual bool	isOpen () const
virtual bool	open (const ossimFilename &file)
	Opens a stream to the srtm cell. More...
virtual void	close ()
	Closes the stream to the file. More...
virtual bool	pointHasCoverage (const ossimGpt &) const
	pointHasCoverage(gpt) More...
virtual ossimObject *	dup () const
Public Member Functions inherited from ossimElevCellHandler
	ossimElevCellHandler (const char *elev_filename)
	Constructors: More...
	ossimElevCellHandler (const ossimElevCellHandler &src)
virtual const ossimFilename &	getFilename () const
virtual double	getMeanSpacingMeters () const
	METHOD: meanSpacingMeters() Implements pure virtual for. More...
virtual bool	getAccuracyInfo (ossimElevationAccuracyInfo &info, const ossimGpt &gpt) const
bool	canConnectMyInputTo (ossim_int32 inputIndex, const ossimConnectableObject *object) const
	METHODS: accuracyLE90(), accuracyCE90() Returns the vertical and horizontal accuracy (90% confidence): More...
virtual bool	open (const ossimFilename &, bool=false)
virtual std::ostream &	print (std::ostream &out) const
	Outputs theErrorStatus as an ossimErrorCode and an ossimString. More...
Public Member Functions inherited from ossimElevSource
virtual double	getHeightAboveEllipsoid (const ossimGpt &)
bool	intersectRay (const ossimEcefRay &ray, ossimGpt &gpt, double defaultElevValue=0.0)
	METHOD: intersectRay() More...
virtual double	getMinHeightAboveMSL () const
	Access methods for the bounding elevations: More...
virtual double	getMaxHeightAboveMSL () const
double	getNullHeightValue () const
	Special numeric quantities as defined by this source: More...
double	getSeaLevelValue () const
virtual const ossimGrect &	getBoundingGndRect () const
	METHODS: accuracyLE90(), accuracyCE90() Returns the vertical and horizontal accuracy (90% confidence) in the region of gpt: More...
virtual void	initialize ()
	Implement ossimSource base-class pure virtuals: More...
virtual bool	getComputeStatisticsFlag () const
	Opens a stream to an elevation cell. More...
virtual void	setComputeStatisticsFlag (bool flag)
	Sets the flag which controls whether or not statistics will be computed upon opening a cell and not finding a corresponding statistics file. More...
Public Member Functions inherited from ossimSource
	ossimSource (ossimObject *owner=0)
	ossimSource (ossimObject *owner, ossim_uint32 inputListSize, ossim_uint32 outputListSize, bool inputListIsFixedFlag=true, bool outputListIsFixedFlag=true)
virtual	~ossimSource ()
virtual bool	isSourceEnabled () const
virtual void	enableSource ()
virtual void	disableSource ()
virtual bool	getEnableFlag () const
virtual void	setEnableFlag (bool flag)
virtual bool	isInitialized () const
virtual void	setInitializedFlag (bool flag)
virtual void	setProperty (ossimRefPtr< ossimProperty > property)
virtual ossimRefPtr< ossimProperty >	getProperty (const ossimString &name) const
virtual void	getPropertyNames (std::vector< ossimString > &propertyNames) const
virtual bool	saveState (ossimKeywordlist &kwl, const char *prefix=0) const
virtual bool	loadState (const ossimKeywordlist &kwl, const char *prefix=0)
Public Member Functions inherited from ossimConnectableObject
	ossimConnectableObject (ossimObject *owner=0)
	Base constructor of this object. More...
	ossimConnectableObject (ossimObject *owner, ossim_int32 inputListSize, ossim_int32 outputListSize, bool inputListIsFixedFlag=true, bool outputListIsFixedFlag=true)
virtual	~ossimConnectableObject ()
void	setId (const ossimId &id)
	All connectable objects will have id's. More...
const ossimId &	getId () const
	Will allow us to get this object's id. More...
const ossimObject *	getOwner () const
	Fetches the current owner, most likely a container but not limited to one. More...
virtual void	changeOwner (ossimObject *owner)
	Permits changing the object's owner. More...
virtual void	setDescription (const ossimString &description)
virtual ossimString	getDescription () const
virtual bool	isConnected (ossimConnectableObjectDirectionType direction=CONNECTABLE_DIRECTION_INPUT) const
	will check the direction specified to see if all slots are full. More...
	OSSIM_DEPRECATE_METHOD (virtual ossimConnectableObject *findConnectableObject(const ossimId &id))
	OSSIM_DEPRECATE_METHOD (virtual ossimConnectableObject *findObjectOfType(RTTItypeid typeId, ossimConnectableObjectDirectionType directionType, bool recurse=true))
	OSSIM_DEPRECATE_METHOD (virtual ossimConnectableObject *findObjectOfType(const ossimString &obj, ossimConnectableObjectDirectionType directionType, bool recurse=true))
	OSSIM_DEPRECATE_METHOD (virtual ossimConnectableObject *findInputObjectOfType(const ossimString &className))
virtual ossim_int32	findInputIndex (const ossimConnectableObject *object)
	Return a valid index of the input list if the passed in object is found else return -1. More...
virtual ossim_int32	findInputIndex (const ossimId &id)
	Return a valid index of the input list if the passed id is found else return -1. More...
virtual ossim_int32	findOutputIndex (const ossimConnectableObject *object)
	Return a valid index of the output list if the passed in object is found else return -1. More...
virtual ossim_int32	findOutputIndex (const ossimId &id)
	Return a valid index of the output list if the passed in object is found else return -1. More...
virtual ossim_int32	getMyInputIndexToConnectTo (ossimConnectableObject *object) const
	Should return the first available index to connect to. More...
virtual ossim_int32	getMyOutputIndexToConnectTo (ossimConnectableObject *object) const
	Should return the first available index to connect to. More...
virtual bool	canConnectMyOutputTo (ossim_int32 myOutputIndex, const ossimConnectableObject *object) const
	default implementation is to allow anyone to connect to us. More...
virtual void	disconnect (ossimConnectableObject *object=0)
	Will disconnect the object passed in. More...
virtual void	disconnect (const ossimId &id)
	Will disconnect the object passed in. More...
virtual ossimRefPtr< ossimConnectableObject >	disconnectMyInput (ossim_int32 inputIndex, bool disconnectOutputFlag=true, bool createEventFlag=true)
	Will disconnect the object at the given input index and generate a connection event. More...
virtual void	disconnectMyInput (ossimConnectableObject *input, bool disconnectOutputFlag=true, bool createEventFlag=true)
	Finds the index of the passed in input and calls disconnectMyInput(inputIndex, disconnectOutputFlag, createEventFlag);. More...
virtual void	disconnectMyInputs (ConnectableObjectList &inputList, bool disconnectOutputFlag=true, bool createEventFlag=true)
virtual ossimRefPtr< ossimConnectableObject >	disconnectMyOutput (ossim_int32 outputIndex, bool disconnectInputFlag=true, bool createEventFlag=true)
	Will disconnect the object at the given output index and generate a connection event. More...
virtual void	disconnectMyOutput (ossimConnectableObject *output, bool disconnectInputFlag=true, bool createEventFlag=true)
	Will disconnect the output object. More...
virtual void	disconnectMyOutputs (ConnectableObjectList &outputList, bool disconnectOutputFlag=true, bool createEventFlag=true)
virtual void	disconnectAllInputs ()
	Will disconnect all of the input objects. More...
virtual void	disconnectAllOutputs ()
	Will disconnect all of the output objects. More...
virtual ossim_int32	connectMyInputTo (ossimConnectableObject *inputObject, bool makeOutputConnection=true, bool createEventFlag=true)
	Will try to connect this objects input to the passed in object. More...
virtual ossim_int32	connectMyInputTo (ossim_int32 inputIndex, ossimConnectableObject *inputObject, bool makeOutputConnection=true, bool createEventFlag=true)
	Will connect the specified input to the passed in object. More...
virtual bool	connectMyInputTo (ConnectableObjectList &inputList, bool makeOutputConnection=true, bool createEventFlag=true)
virtual ossim_int32	connectMyOutputTo (ossimConnectableObject *outputObject, bool makeInputConnection=true, bool createEventFlag=true)
	Will try to connect this objects output to the passed in object. More...
virtual bool	connectMyOutputTo (ConnectableObjectList &outputList, bool makeInputConnection=true, bool createEventFlag=true)
virtual bool	connectInputList (ConnectableObjectList &inputList)
	Will disconnect itself from all inputs and reset to the passed in input list. More...
virtual bool	connectOutputList (ConnectableObjectList &outputList)
	Will disconnect itself from all outputs and reset to the passed in output list. More...
virtual ossim_uint32	getNumberOfInputs () const
	Returns the number of input objects. More...
virtual ossim_uint32	getNumberOfOutputs () const
	Return the number of output objects. More...
ossimConnectableObject *	getInput (ossim_uint32 index=0)
	returns the object at the specified index. More...
const ossimConnectableObject *	getInput (ossim_uint32 index=0) const
	returns the object at the specified index. More...
ossimConnectableObject *	getOutput (ossim_uint32 index=0)
	returns the object at the specified index. More...
const ossimConnectableObject *	getOutput (ossim_uint32 index=0) const
	returns the object at the specified index. More...
virtual void	setNumberOfInputs (ossim_int32 numberOfInputs)
	Will set the number of inputs. More...
virtual bool	getInputListIsFixedFlag () const
virtual bool	getOutputListIsFixedFlag () const
virtual void	setNumberOfOutputs (ossim_int32 numberOfInputs)
	Will set the number of outputs. More...
const ConnectableObjectList &	getInputList () const
const ConnectableObjectList &	getOutputList () const
ConnectableObjectList &	getInputList ()
ConnectableObjectList &	getOutputList ()
	OSSIM_DEPRECATE_METHOD (virtual void findAllObjectsOfType(ConnectableObjectList &result, const RTTItypeid &typeInfo, bool recurse=true))
	OSSIM_DEPRECATE_METHOD (virtual void findAllObjectsOfType(ConnectableObjectList &result, const ossimString &className, bool recurse=true))
virtual void	propagateEventToOutputs (ossimEvent &event)
virtual void	propagateEventToInputs (ossimEvent &event)
virtual void	setProperty (const ossimString &name, const ossimString &value)
virtual ossim_uint32	saveStateOfAllInputs (ossimKeywordlist &kwl, bool saveThisStateFlag=true, ossim_uint32 objectIndex=1, const char *prefix=0) const
	Save the state of all inputs to a keyword list. More...
virtual bool	fillContainer (ossimConnectableContainer &container)
	Inserts this object and all of its children and inputs into the container provided. More...
bool	moveInputUp (const ossimId &id)
	Moves the input connection matching id up one in the connection list. More...
bool	moveInputDown (const ossimId &id)
	Moves the input connection matching id down one in the connection list. More...
bool	moveInputToTop (const ossimId &id)
	Moves the input connection matching id to the top of the connection list. More...
bool	moveInputToBottom (const ossimId &id)
	Moves the input connection matching id to the bottom of the connection list. More...
virtual void	accept (ossimVisitor &visitor)
	We will add a visitor interface for all connectable objects. More...
Public Member Functions inherited from ossimObject
	ossimObject ()
virtual	~ossimObject ()
virtual ossimString	getShortName () const
virtual ossimString	getLongName () 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	isEqualTo (const ossimObject &obj, ossimCompareType compareType=OSSIM_COMPARE_FULL) const
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
Public Member Functions inherited from ossimListenerManager
	ossimListenerManager ()
virtual	~ossimListenerManager ()
virtual void	fireEvent (ossimEvent &event)
virtual bool	addListener (ossimListener *listener)
virtual bool	removeListener (ossimListener *listener)
virtual bool	findListener (ossimListener *listener)
Public Member Functions inherited from ossimPropertyInterface
	ossimPropertyInterface ()
virtual	~ossimPropertyInterface ()
virtual ossimString	getPropertyValueAsString (const ossimString &name) const
void	getPropertyList (std::vector< ossimRefPtr< ossimProperty > > &propertyList) const
void	setProperties (std::vector< ossimRefPtr< ossimProperty > > &propertyList)
Public Member Functions inherited from ossimErrorStatusInterface
	ossimErrorStatusInterface ()
virtual	~ossimErrorStatusInterface ()
virtual ossimErrorCode	getErrorStatus () const
virtual ossimString	getErrorStatusString () const
virtual void	setErrorStatus (ossimErrorCode error_status) const
virtual void	setErrorStatus () const
virtual void	clearErrorStatus () const
bool	hasError () const

Protected Member Functions
virtual	~ossimImageElevationHandler ()
	Protected destructor. More...
Protected Member Functions inherited from ossimElevCellHandler
	ossimElevCellHandler ()
virtual	~ossimElevCellHandler ()
Protected Member Functions inherited from ossimElevSource
virtual	~ossimElevSource ()
	ossimElevSource ()
	Constructors/Destructors: More...
	ossimElevSource (const ossimElevSource &src)
Protected Member Functions inherited from ossimSource
	ossimSource (const ossimSource &rhs)
const ossimSource &	operator= (const ossimSource &rhs)
Protected Member Functions inherited from ossimConnectableObject
ossimConnectableObject *	findObjectOfType (ConnectableObjectList *connectableList, ossimVisitor &visitor)
Protected Member Functions inherited from ossimReferenced
virtual	~ossimReferenced ()
Protected Member Functions inherited from ossimListenerManager
	ossimListenerManager (const ossimListenerManager &rhs)

Private Member Functions
	ossimImageElevationHandler (const ossimImageElevationHandler &)
	Hidden from use copy constructor. More...
const ossimImageElevationHandler &	operator= (const ossimImageElevationHandler &rhs)
	Hidden from use assignment operator. More...
ossimImageData *	getTile (ossim_uint32 x, ossim_uint32 y) const
	Looks for an elevation tile in the cache first before reading the tile from the input handler. More...

Private Attributes
ossimRefPtr< ossimImageHandler >	m_ih
	Pointers to links in chain. More...
ossimRefPtr< ossimImageGeometry >	m_geom
std::vector< TileCacheEntry >	m_tileCache
ossimDrect	m_rect
	Image space rect stored as drect for inlined pointHasCoverage method. More...
ossimIpt	m_tileSize
ossim_uint32	m_numTilesPerRow
std::mutex	m_mutex

Additional Inherited Members
Public Types inherited from ossimConnectableObject
enum	ossimConnectableObjectDirectionType { CONNECTABLE_DIRECTION_NONE = 0, CONNECTABLE_DIRECTION_INPUT = 1, CONNECTABLE_DIRECTION_OUTPUT = 2 }
typedef std::vector< ossimRefPtr< ossimConnectableObject > >	ConnectableObjectList
Protected Attributes inherited from ossimElevCellHandler
ossimFilename	theFilename
	Virtual method for reading. More...
double	theMeanSpacing
double	theAbsLE90
double	theAbsCE90
Protected Attributes inherited from ossimElevSource
double	theMinHeightAboveMSL
	Data members: More...
double	theMaxHeightAboveMSL
double	theNullHeightValue
double	theSeaLevelValue
ossimGrect	theGroundRect
bool	theComputeStatsFlag
Protected Attributes inherited from ossimSource
bool	theEnableFlag
bool	theInitializedFlag
Protected Attributes inherited from ossimConnectableObject
ossimId	theId
ossimString	theDescription
ossimObject *	theOwner
bool	theInputListIsFixedFlag
	Indicates whether the theInputObjectList is fixed. More...
bool	theOutputListIsFixedFlag
	Indicates whether the theOutputObjectList is fixed. More...
ConnectableObjectList	theInputObjectList
	Holds a list of input objects. More...
ConnectableObjectList	theOutputObjectList
	Holds a list of output objects. More...
Protected Attributes inherited from ossimListenerManager
std::list< ossimListener * >	theListenerList
bool	theEnabledFlag
std::list< ossimListener * >	theDelayedAdd
std::list< ossimListener * >	theDelayedRemove
bool	theFireEventFlag
Protected Attributes inherited from ossimErrorStatusInterface
ossimErrorCode	theErrorStatus

Detailed Description

Elevation source for a generic image opened via ossimImageHandler.

Definition at line 32 of file ossimImageElevationHandler.h.

Constructor & Destructor Documentation

ossimImageElevationHandler() [1/3]

ossimImageElevationHandler::ossimImageElevationHandler

(

)

default constructor

Definition at line 36 of file ossimImageElevationHandler.cpp.

References ossim::defaultTileSize(), and m_tileSize.

   :
   ossimElevCellHandler(),
   m_rect(),
   m_tileSize(256,256),
   m_numTilesPerRow(0),
   m_mutex()
{
   ossim::defaultTileSize(m_tileSize);
}

ossimImageElevationHandler() [2/3]

ossimImageElevationHandler::ossimImageElevationHandler

(

const ossimFilename &

file

)

Definition at line 47 of file ossimImageElevationHandler.cpp.

References ossim::defaultTileSize(), m_tileSize, and open().

   :
   ossimElevCellHandler(),
   m_rect(),
   m_tileSize(256,256),
   m_numTilesPerRow(0),
   m_mutex()
{
   ossim::defaultTileSize(m_tileSize);
   open(file);
}

~ossimImageElevationHandler()

ossimImageElevationHandler::~ossimImageElevationHandler ( )

protectedvirtual

Protected destructor.

This class is derived from ossimReferenced so users should always use ossimRefPtr<ossimImageElevationHandler> to hold instance.

Definition at line 131 of file ossimImageElevationHandler.cpp.

References close().

{
   close();
}

ossimImageElevationHandler() [3/3]

ossimImageElevationHandler::ossimImageElevationHandler ( const ossimImageElevationHandler &  copy )

private

Hidden from use copy constructor.

Definition at line 282 of file ossimImageElevationHandler.cpp.

{
   *this = copy;
}

Member Function Documentation

close()

void ossimImageElevationHandler::close ( )

inlinevirtual

Closes the stream to the file.

Reimplemented from ossimElevCellHandler.

Definition at line 137 of file ossimImageElevationHandler.h.

References m_geom, and m_ih.

Referenced by open(), and ~ossimImageElevationHandler().

{
   m_geom  = 0;
   m_ih    = 0;
}

dup()

virtual ossimObject* ossimImageElevationHandler::dup ( ) const

inlinevirtual

Implements ossimElevSource.

Definition at line 81 of file ossimImageElevationHandler.h.

References ossimElevCellHandler::getFilename().

{ return new ossimImageElevationHandler(this->getFilename()); }

getHeightAboveMSL()

double ossimImageElevationHandler::getHeightAboveMSL ( const ossimGpt &  gpt )

virtual

METHOD: getHeightAboveMSL Height access methods.

Implements ossimElevSource.

Definition at line 136 of file ossimImageElevationHandler.cpp.

References ossimImageData::getImageRectangle(), ossimImageData::getNullPix(), ossimImageData::getPix(), getTile(), ossimIrect::lr(), m_geom, m_rect, ossim::nan(), ossimDrect::pointWithin(), ossimImageGeometry::worldToLocal(), ossimIpt::x, ossimDpt::x, ossimIpt::y, and ossimDpt::y.

{
   double height = ossim::nan();

   // Get the image point for the world point.
   ossimDpt dpt;
   m_geom->worldToLocal(gpt, dpt);

   if  ( !m_rect.pointWithin(dpt) )
      return height;

   // Cast it to an int which will shift to nearest upper left post.
   ossim_uint32 x0 = static_cast<ossim_uint32>(dpt.x);
   ossim_uint32 y0 = static_cast<ossim_uint32>(dpt.y);

   ossimRefPtr<ossimImageData> data = getTile(x0, y0);

   // Check if we are at the bottom or right edge of the tile to move in one post:
   ossimIpt data_lr = data->getImageRectangle().lr();
   if (x0 == static_cast<ossim_uint32>(data_lr.x))
      --x0;
   if (y0 == static_cast<ossim_uint32>(data_lr.y))
      --y0;

   double p00 = data->getPix( ossimIpt(x0,   y0)   );
   double p01 = data->getPix( ossimIpt(x0+1, y0)   );
   double p10 = data->getPix( ossimIpt(x0,   y0+1) );
   double p11 = data->getPix( ossimIpt(x0+1, y0+1) );

   double xt0 = dpt.x - x0;
   double yt0 = dpt.y - y0;
   double xt1 = 1-xt0;
   double yt1 = 1-yt0;

   double w00 = xt1*yt1;
   double w01 = xt0*yt1;
   double w10 = xt1*yt0;
   double w11 = xt0*yt0;

   // Test for null posts and set the corresponding weights to 0:
   const double NP = data->getNullPix(0);

   if (p00 == NP)
      w00 = 0.0;
   if (p01 == NP)
      w01 = 0.0;
   if (p10 == NP)
      w10 = 0.0;
   if (p11 == NP)
      w11 = 0.0;

#if 0 /* Serious debug only... */
   cout << "\np00:  " << p00
         << "\np01:  " << p01
         << "\np10:  " << p10
         << "\np11:  " << p11
         << "\nw00:  " << w00
         << "\nw01:  " << w01
         << "\nw10:  " << w10
         << "\nw11:  " << w11
         << endl;
#endif

   double sum_weights = w00 + w01 + w10 + w11;
   if (sum_weights)
      height = (p00*w00 + p01*w01 + p10*w10 + p11*w11) / sum_weights;

   return height;
}

getPostValue()

double ossimImageElevationHandler::getPostValue ( const ossimIpt &  gridPt ) const

virtual

METHOD: getPostValue Returns the value at a given grid point as a double.

Satisfies pure virtual.

Implements ossimElevCellHandler.

Definition at line 266 of file ossimImageElevationHandler.cpp.

References ossimImageData::getNullPix(), ossimImageData::getPix(), getTile(), m_rect, ossim::nan(), ossimDrect::pointWithin(), ossimRefPtr< T >::valid(), ossimIpt::x, and ossimIpt::y.

{
   double height = ossim::nan();
   if ( m_rect.pointWithin(ossimDpt(gridPt)) )
   {
      ossimRefPtr<ossimImageData> data = getTile(gridPt.x, gridPt.y);
      if ( data.valid() )
      {
         height = data->getPix(0, 0);
         if (height == data->getNullPix(0))
            height = ossim::nan();
      }
   }
   return height;
}

getSizeOfElevCell()

ossimIpt ossimImageElevationHandler::getSizeOfElevCell ( ) const

virtual

METHOD: getSizeOfElevCell Returns the number of post in the cell.

Satisfies pure virtual. Note: x = longitude, y = latitude

Implements ossimElevCellHandler.

Definition at line 255 of file ossimImageElevationHandler.cpp.

References ossimImageHandler::getNumberOfLines(), ossimImageHandler::getNumberOfSamples(), m_ih, ossimRefPtr< T >::valid(), ossimIpt::x, and ossimIpt::y.

{
   ossimIpt sz(0,0);
   if ( m_ih.valid() )
   {
      sz.x = static_cast<ossim_int32>(m_ih->getNumberOfSamples(0));
      sz.y = static_cast<ossim_int32>(m_ih->getNumberOfLines(0));
   }
   return sz;
}

getTile()

ossimImageData * ossimImageElevationHandler::getTile ( ossim_uint32  x, ossim_uint32  y  ) const

private

Looks for an elevation tile in the cache first before reading the tile from the input handler.

Definition at line 206 of file ossimImageElevationHandler.cpp.

References ossimImageData::assign(), ossimImageData::dup(), ossimRefPtr< T >::get(), ossimImageSource::getTile(), m_ih, m_mutex, m_numTilesPerRow, m_tileCache, m_tileSize, ossimRefPtr< T >::valid(), ossimIpt::x, x, ossimIpt::y, and y.

Referenced by getHeightAboveMSL(), and getPostValue().

{
   // Establish the tile ID that this post belongs to:
   ossim_uint32 u = x/m_tileSize.x;
   ossim_uint32 v = y/m_tileSize.y;
   ossim_uint32 tile_id = v*m_numTilesPerRow + u;

   ossimRefPtr<ossimImageData> data = 0;

   // Search for this tile in the cache:
   std::lock_guard<std::mutex> lock(m_mutex);
   vector<TileCacheEntry>::iterator iter = m_tileCache.begin();
   while ((iter != m_tileCache.end()) && (iter->id != tile_id))
      ++iter;

   if (iter != m_tileCache.end())
   {
      // Found an entry in the cache:
      data = iter->data;
      if (iter != m_tileCache.begin())
      {
         // Need to move the entry to the top of the list (current most popular)
         TileCacheEntry temp = *iter;
         m_tileCache.erase(iter);
         m_tileCache.insert(m_tileCache.begin(), temp);
      }
   }
   else
   {
      // Didn't find the tile in the cache, read it from the handler and insert into the cache:
      ossimIpt ul (u*m_tileSize.x, v*m_tileSize.y);
      ossimIpt lr (ul.x + m_tileSize.x - 1, ul.y + m_tileSize.y - 1);
      ossimIrect tileRect (ul, lr);
      ossimRefPtr<ossimImageData> inData = m_ih->getTile(tileRect, 0 );
      if (inData.valid())
      {
         // Always insert at beginning. Need to check for overflow:
         data = (ossimImageData*) inData->dup();
         data->assign(inData.get());
         TileCacheEntry entry (tile_id, data.get());
         if (m_tileCache.size() == MAX_TILE_CACHE_SIZE)
            m_tileCache.pop_back();
         m_tileCache.insert(m_tileCache.begin(), entry);
      }
   }

   return data.get();
}

isOpen()

bool ossimImageElevationHandler::isOpen ( ) const

inlinevirtual

Returns

True if open, false if not.

Definition at line 132 of file ossimImageElevationHandler.h.

References m_ih, and ossimRefPtr< T >::valid().

Referenced by ossimImageElevationDatabase::createCell(), and open().

{
   return m_ih.valid();
}

open()

bool ossimImageElevationHandler::open ( const ossimFilename &  file )

virtual

Opens a stream to the srtm cell.

Returns

Returns true on success, false on error.

Definition at line 59 of file ossimImageElevationHandler.cpp.

References close(), ossimImageGeometry::getCornerGpts(), ossimImageHandler::getImageGeometry(), ossimImageGeometry::getMetersPerPixel(), ossimImageHandler::getNumberOfLines(), ossimImageHandler::getNumberOfSamples(), ossimImageHandlerRegistry::instance(), isOpen(), ossimGpt::lat, ossimGpt::lon, m_geom, m_ih, m_numTilesPerRow, m_rect, m_tileSize, ossimGrect::makeNan(), ossimImageHandlerRegistry::open(), ossimString::size(), ossimElevCellHandler::theFilename, ossimElevSource::theGroundRect, ossimElevCellHandler::theMeanSpacing, ossimRefPtr< T >::valid(), ossimDrect::width(), ossimIpt::x, ossimDpt::x, and ossimDpt::y.

Referenced by ossimImageElevationDatabase::createCell(), ossimImageElevationDatabase::getBoundingRect(), operator=(), and ossimImageElevationHandler().

{
   static const char M[] = "ossimImageElevationHandler::open";
   
   bool result = false;

   if ( isOpen() ) close();
   
   if ( file.size() )
   {
      //---
      // NOTE: The false passed to open is flag to NOT open overviews. If code is ever changed
      // to go between reduced resolution levels this should be changed.
      //---
      m_ih = ossimImageHandlerRegistry::instance()->open(file, true, false);
      if ( m_ih.valid() )
      {
         m_geom = m_ih->getImageGeometry();
         if ( m_geom.valid() )
         {
            result = true;

            // Image rect stored as a drect for ossimImageElevationHandler::pointHasCoverage
            // method.
            m_rect = ossimDrect(0.0, 0.0, m_ih->getNumberOfSamples()-1, m_ih->getNumberOfLines()-1);
            m_numTilesPerRow = m_rect.width()/m_tileSize.x;
            if (m_numTilesPerRow * m_tileSize.x != m_rect.width())
               ++m_numTilesPerRow;

            // Initialize base class stuff.
            theFilename = file;

            theMeanSpacing = (m_geom->getMetersPerPixel().x + m_geom->getMetersPerPixel().y) / 2.0;

            // Set the ossimElevSource::theGroundRect
            std::vector<ossimGpt> corner(4);
            if ( m_geom->getCornerGpts(corner[0], corner[1], corner[2], corner[3]) )
            {
               ossimGpt ulGpt(corner[0]);
               ossimGpt lrGpt(corner[0]);
               for ( ossim_uint32 i = 1; i < 4; ++i )
               {
                  if ( corner[i].lon < ulGpt.lon ) ulGpt.lon = corner[i].lon;
                  if ( corner[i].lat > ulGpt.lat ) ulGpt.lat = corner[i].lat;
                  if ( corner[i].lon > lrGpt.lon ) lrGpt.lon = corner[i].lon;
                  if ( corner[i].lat < lrGpt.lat ) lrGpt.lat = corner[i].lat;
               }
               theGroundRect = ossimGrect(ulGpt, lrGpt);
            }
            else
            {
               theGroundRect.makeNan();
            }
         }
         // theAbsLE90 ???
         // theAbsCE90 ???
      }
   }

   if ( traceDebug() )
   {
      ossimNotify(ossimNotifyLevel_DEBUG)
         << M << " DEBUG:"
         << "\nmean spacing(meters): " << theMeanSpacing
         << "\nunding rect: " << theGroundRect
         << "\nreturn status: " << (result?"true\n":"false\n");
   }
         
   return result;
}

operator=()

const ossimImageElevationHandler & ossimImageElevationHandler::operator= ( const ossimImageElevationHandler &  rhs )

private

Hidden from use assignment operator.

Definition at line 288 of file ossimImageElevationHandler.cpp.

References open(), and ossimElevCellHandler::theFilename.

{
   open(rhs.theFilename);
   return *this;
}

pointHasCoverage()

bool ossimImageElevationHandler::pointHasCoverage ( const ossimGpt &  gpt ) const

inlinevirtual

pointHasCoverage(gpt)

Overrides ossimElevCellHandler::pointHasCoverage

Returns

TRUE if coverage exists over gpt.

Reimplemented from ossimElevCellHandler.

Definition at line 143 of file ossimImageElevationHandler.h.

References m_geom, m_rect, ossimDrect::pointWithin(), ossimRefPtr< T >::valid(), and ossimImageGeometry::worldToLocal().

Referenced by ossimImageElevationDatabase::createCell().

{
   if ( m_geom.valid() )
   {
      ossimDpt dpt;
      m_geom->worldToLocal(gpt, dpt);
      return m_rect.pointWithin(dpt);
   }
   return false;
}

Member Data Documentation

m_geom

ossimRefPtr<ossimImageGeometry> ossimImageElevationHandler::m_geom

private

Definition at line 119 of file ossimImageElevationHandler.h.

Referenced by close(), getHeightAboveMSL(), open(), and pointHasCoverage().

m_ih

ossimRefPtr<ossimImageHandler> ossimImageElevationHandler::m_ih

mutableprivate

Pointers to links in chain.

Definition at line 118 of file ossimImageElevationHandler.h.

Referenced by close(), getSizeOfElevCell(), getTile(), isOpen(), and open().

m_mutex

std::mutex ossimImageElevationHandler::m_mutex

mutableprivate

Definition at line 127 of file ossimImageElevationHandler.h.

Referenced by getTile().

m_numTilesPerRow

ossim_uint32 ossimImageElevationHandler::m_numTilesPerRow

private

Definition at line 125 of file ossimImageElevationHandler.h.

Referenced by getTile(), and open().

m_rect

ossimDrect ossimImageElevationHandler::m_rect

private

Image space rect stored as drect for inlined pointHasCoverage method.

Definition at line 123 of file ossimImageElevationHandler.h.

Referenced by getHeightAboveMSL(), getPostValue(), open(), and pointHasCoverage().

m_tileCache

std::vector<TileCacheEntry> ossimImageElevationHandler::m_tileCache

mutableprivate

Definition at line 120 of file ossimImageElevationHandler.h.

Referenced by getTile().

m_tileSize

ossimIpt ossimImageElevationHandler::m_tileSize

private

Definition at line 124 of file ossimImageElevationHandler.h.

Referenced by getTile(), open(), and ossimImageElevationHandler().

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

• ossimImageElevationHandler.h
• ossimImageElevationHandler.cpp