for an srtm file. More...

#include <ossimSrtmHandler.h>

Inheritance diagram for ossimSrtmHandler:

Public Types
enum	{ NULL_POST = -32768 }

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

Public Member Functions
	ossimSrtmHandler ()
	Constructor that takes a file name. More...

	ossimSrtmHandler (const ossimSrtmHandler &)

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, bool memoryMapFlag=false)
	Opens a stream to the srtm cell. More...

virtual void	close ()
	Closes the stream to the file. 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	pointHasCoverage (const ossimGpt &) const
	METHOD: pointIsInsideRect() Method to check if the ground point elevation is defined: 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 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	~ossimSrtmHandler ()
	destructor More...

template<class T >
double	getHeightAboveMSLFileTemplate (T dummy, const ossimGpt &gpt)

template<class T >
double	getHeightAboveMSLMemoryTemplate (T dummy, const ossimGpt &gpt)

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)

Protected Attributes
ossimSrtmSupportData	m_supportData

std::mutex	m_fileStrMutex

std::ifstream	m_fileStr

bool	m_streamOpen
	true if stream is open. More...

ossim_int32	m_numberOfLines

ossim_int32	m_numberOfSamples

ossim_int32	m_srtmRecordSizeInBytes

double	m_latSpacing

double	m_lonSpacing

ossimDpt	m_nwCornerPost

ossimEndian *	m_swapper

ossimScalarType	m_scalarType

std::vector< ossim_int8 >	m_memoryMap

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

for an srtm file.

Definition at line 29 of file ossimSrtmHandler.h.

Member Enumeration Documentation

◆ anonymous enum

anonymous enum

Enumerator
NULL_POST

Definition at line 38 of file ossimSrtmHandler.h.

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

Constructor & Destructor Documentation

◆ ossimSrtmHandler() [1/2]

ossimSrtmHandler::ossimSrtmHandler ( )

Constructor that takes a file name.

Definition at line 30 of file ossimSrtmHandler.cpp.

    :
       ossimElevCellHandler(),
       m_streamOpen(false),
       m_numberOfLines(0),
       m_numberOfSamples(0),
       m_srtmRecordSizeInBytes(0),
       m_latSpacing(0.0),
       m_lonSpacing(0.0),
       m_nwCornerPost(),
       m_swapper(0)
 {
 }

◆ ossimSrtmHandler() [2/2]

ossimSrtmHandler::ossimSrtmHandler ( const ossimSrtmHandler & src )

Definition at line 384 of file ossimSrtmHandler.cpp.

References ossimString::c_str(), ossimElevCellHandler::getFilename(), isOpen(), m_fileStr, and m_memoryMap.

 :ossimElevCellHandler(src),
 m_supportData(src.m_supportData),
 m_streamOpen(src.m_streamOpen),
 m_numberOfLines(src.m_numberOfLines),
 m_numberOfSamples(src.m_numberOfSamples),
 m_srtmRecordSizeInBytes(src.m_srtmRecordSizeInBytes),
 m_latSpacing(src.m_latSpacing),
 m_lonSpacing(src.m_lonSpacing),
 m_nwCornerPost(src.m_nwCornerPost),
 m_swapper(src.m_swapper?new ossimEndian:0),
 m_scalarType(src.m_scalarType),
 m_memoryMap(src.m_memoryMap)
 {
    if(m_memoryMap.empty()&&src.isOpen())
    {
       m_fileStr.open(src.getFilename().c_str(),
                      std::ios::binary|std::ios::in);
    }
 }

◆ ~ossimSrtmHandler()

ossimSrtmHandler::~ossimSrtmHandler ( )

protectedvirtual

destructor

Definition at line 44 of file ossimSrtmHandler.cpp.

References close(), and m_swapper.

 {
    if (m_swapper)
    {
       delete m_swapper;
       m_swapper = 0;
    }
    close();
 }

Member Function Documentation

◆ close()

void ossimSrtmHandler::close ( )

virtual

Closes the stream to the file.

Reimplemented from ossimElevCellHandler.

Definition at line 492 of file ossimSrtmHandler.cpp.

References m_fileStr, m_memoryMap, and m_streamOpen.

Referenced by ~ossimSrtmHandler().

 {
    m_fileStr.close();
    m_memoryMap.clear();
    m_streamOpen = false;
 }

◆ dup()

virtual ossimObject* ossimSrtmHandler::dup ( ) const

inlinevirtual

Implements ossimElevSource.

Definition at line 77 of file ossimSrtmHandler.h.

References open().

    {
       ossimSrtmHandler* obj = new ossimSrtmHandler();
       obj->open(theFilename, (m_memoryMap.size() != 0));
       return obj;
    }

◆ getHeightAboveMSL()

double ossimSrtmHandler::getHeightAboveMSL ( const ossimGpt & gpt )

virtual

METHOD: getHeightAboveMSL Height access methods.

Implements ossimElevSource.

Definition at line 54 of file ossimSrtmHandler.cpp.

References getHeightAboveMSLFileTemplate(), getHeightAboveMSLMemoryTemplate(), isOpen(), m_memoryMap, m_scalarType, ossim::nan(), OSSIM_FLOAT32, and OSSIM_SINT16.

 {
    if(!isOpen()) return ossim::nan();
    if(!m_memoryMap.empty())
    {
       switch(m_scalarType)
       {
          case OSSIM_SINT16:
          {
             return getHeightAboveMSLMemoryTemplate((ossim_sint16)0, gpt);
          }
          case OSSIM_FLOAT32:
          {
             return getHeightAboveMSLMemoryTemplate((ossim_float32)0, gpt);
          }
          default:
          {
             break;
          }
       }
    }
    else
    {
       switch(m_scalarType)
       {
          case OSSIM_SINT16:
          {
             return getHeightAboveMSLFileTemplate((ossim_sint16)0, gpt);
          }
          case OSSIM_FLOAT32:
          {
             return getHeightAboveMSLFileTemplate((ossim_float32)0, gpt);
          }
          default:
          {
             break;
          }
       }
    }
 
    return ossim::nan();
 }

◆ getHeightAboveMSLFileTemplate()

template<class T >

double ossimSrtmHandler::getHeightAboveMSLFileTemplate	(	T	dummy,
		const ossimGpt &	gpt
	)

protected

Definition at line 98 of file ossimSrtmHandler.cpp.

References ossimDpt::lat, ossimGpt::lat, ossimDpt::lon, ossimGpt::lon, m_fileStr, m_fileStrMutex, m_latSpacing, m_lonSpacing, m_numberOfLines, m_numberOfSamples, m_nwCornerPost, m_srtmRecordSizeInBytes, m_swapper, ossim::nan(), ossimEndian::swap(), and ossimElevSource::theNullHeightValue.

Referenced by getHeightAboveMSL().

 {
    // Establish the grid indexes:
    double xi = (gpt.lon - m_nwCornerPost.lon) / m_lonSpacing;
    double yi = (m_nwCornerPost.lat - gpt.lat) / m_latSpacing;
 
    int x0 = static_cast<int>(xi);
    int y0 = static_cast<int>(yi);
 
    if(x0 == (m_numberOfSamples-1))
    {
       --x0; // Move over one post.
    }
    
    // Check for top edge.
    //    if (gpt.lat == theGroundRect.ul().lat)
    if(y0 == (m_numberOfLines-1))
    {
       --y0; // Move down one post.
    }
 
 
    // Do some error checking.
    if ( xi < 0.0 || yi < 0.0 ||
         x0 > (m_numberOfSamples  - 2.0) ||
         y0 > (m_numberOfLines    - 2.0) )
    {
       return ossim::nan();
    }
 
    T p[4];
    
    double p00;
    double p01;
    double p10;
    double p11;
 
    //---
    // Grab the four points from the srtm cell needed.
    //---
    std::streampos offset = y0 * m_srtmRecordSizeInBytes + x0 * sizeof(T);
 
    {
       std::lock_guard<std::mutex> lock(m_fileStrMutex);
 
       // lets a seek cur
       // 
       // Put the file pointer at the start of the first elevation post.
       m_fileStr.seekg(offset, std::ios::beg);
       // Get the first post.
       m_fileStr.read((char*)p, sizeof(T));
       
       // Get the second post.
       m_fileStr.read((char*)(p+1), sizeof(T));
       
       // Move over to the next column.
       offset += m_srtmRecordSizeInBytes;
       
       m_fileStr.seekg(offset, std::ios::beg);
       
       // Get the third post.
       m_fileStr.read((char*)(p+2), sizeof(T));
       
       // Get the fourth post.
       m_fileStr.read((char*)(p+3), sizeof(T));
       
       if(m_fileStr.fail())
       {
          return ossim::nan();
       }
    }
    if (m_swapper)
    {
       m_swapper->swap((T*)p, 4);
    }
 
    p00 = p[0];
    p01 = p[1];
    p10 = p[2];
    p11 = p[3];
    
    // Perform bilinear interpolation:
 
    double xt0 = xi - x0;
    double yt0 = yi - 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:
    //***
    if (p00 == theNullHeightValue)
       w00 = 0.0;
    if (p01 == theNullHeightValue)
       w01 = 0.0;
    if (p10 == theNullHeightValue)
       w10 = 0.0;
    if (p11 == theNullHeightValue)
       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)
    {
       return (p00*w00 + p01*w01 + p10*w10 + p11*w11) / sum_weights;
    }
 
    return ossim::nan();
 }

◆ getHeightAboveMSLMemoryTemplate()

template<class T >

double ossimSrtmHandler::getHeightAboveMSLMemoryTemplate	(	T	dummy,
		const ossimGpt &	gpt
	)

protected

Definition at line 227 of file ossimSrtmHandler.cpp.

References ossim::almostEqual(), ossimDpt::lat, ossimGpt::lat, ossimDpt::lon, ossimGpt::lon, ossimGrect::lr(), m_latSpacing, m_lonSpacing, m_memoryMap, m_numberOfLines, m_numberOfSamples, m_nwCornerPost, m_srtmRecordSizeInBytes, m_swapper, ossim::nan(), ossimEndian::swap(), ossimElevSource::theGroundRect, and ossimElevSource::theNullHeightValue.

Referenced by getHeightAboveMSL().

 {
    // Establish the grid indexes:
    double xi = (gpt.lon - m_nwCornerPost.lon) / m_lonSpacing;
    double yi = (m_nwCornerPost.lat - gpt.lat) / m_latSpacing;
    
    int x0 = static_cast<int>(xi);
    int y0 = static_cast<int>(yi);
    
    if(x0 == (m_numberOfSamples-1))
    {
       --x0; // Move over one post.
    }
    
    // Check for top edge.
    //    if (gpt.lat == theGroundRect.ul().lat)
    if(y0 == (m_numberOfLines-1))
    {
       --y0; // Move down one post.
    }
 #if 0
    // Check for right edge.
    if (ossim::almostEqual(gpt.lon,theGroundRect.lr().lon))
    {
       --x0; // Move over one post to the left.
    }
    
    // Check for bottom edge.
    if (ossim::almostEqual(gpt.lat,theGroundRect.lr().lat))
    {
       --y0; // Move up one post.
    }
 #endif
    // Do some error checking.
    if ( xi < 0.0 || yi < 0.0 ||
        x0 > (m_numberOfSamples  - 2.0) ||
        y0 > (m_numberOfLines    - 2.0) )
    {
       //       std::cout << "ossimSrtmHandler::getHeightAboveMSLTemplate: leaving 1" << std::endl;
       return ossim::nan();
    }
 
    // Grab the four points from the srtm cell needed.
    ossim_uint64 offset = y0 * m_srtmRecordSizeInBytes + x0 * sizeof(T);
    ossim_uint64 offset2 =offset+m_srtmRecordSizeInBytes;
    T v00 = *(reinterpret_cast<T*> (&m_memoryMap[offset]));
    T v01 = *(reinterpret_cast<T*> (&m_memoryMap[offset + sizeof(T)]));
    T v10 = *(reinterpret_cast<T*> (&m_memoryMap[offset2]));
    T v11 = *(reinterpret_cast<T*> (&m_memoryMap[offset2 + sizeof(T)]));
    if (m_swapper)
    {
       m_swapper->swap(v00);
       m_swapper->swap(v01);
       m_swapper->swap(v10);
       m_swapper->swap(v11);
    }
    double p00 = v00;
    double p01 = v01;
    double p10 = v10;
    double p11 = v11;
    
    double xt0 = xi - x0;
    double yt0 = yi - 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:
    //***
    if (p00 == theNullHeightValue)
       w00 = 0.0;
    if (p01 == theNullHeightValue)
       w01 = 0.0;
    if (p10 == theNullHeightValue)
       w10 = 0.0;
    if (p11 == theNullHeightValue)
       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)
    {
       return (p00*w00 + p01*w01 + p10*w10 + p11*w11) / sum_weights;
    }
    
    return ossim::nan();
 }

◆ getPostValue()

double ossimSrtmHandler::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 333 of file ossimSrtmHandler.cpp.

References ossim::nan(), ossimNotify(), ossimNotifyLevel_WARN, and ossimElevSource::theNullHeightValue.

 {
    ossimNotify(ossimNotifyLevel_WARN)
       << "ossimSrtmHandler::getPostValue(const ossimIpt& gridPt):  NEED TO IMPLEMENT TO NEW INTERFACE\n";
    
    return theNullHeightValue;
 #if 0
    static const char MODULE[] = "ossimSrtmHandler::getPostValue";
    
    if(!theFileStr.valid()) return ossim::nan();
    
    // Do some error checking.
    if ( gridPt.x < 0.0 || gridPt.y < 0.0 ||
         gridPt.x > (theNumberOfSamples  - 1) ||
         gridPt.y > (theNumberOfLines - 1) )
    {
       if(traceDebug())
       {
          ossimNotify(ossimNotifyLevel_WARN)
             << "WARNING " << MODULE << ": No intersection..." << std::endl;
       }
       return ossim::nan();
    }
 
    if (!isOpen())
    {
       return ossim::nan();
    }
 
    std::streampos offset = gridPt.y * theSrtmRecordSizeInBytes + gridPt.x * 2;
 
    // Put the file pointer at the start of the first elevation post.
    m_fileStr.seekg(offset, std::ios::beg);
 
    ossim_sint16 p;
 
    // Get the post.
    m_fileStr.read((char*)&p, 2);
    if (theSwapper)
    {
       theSwapper->swap(p);
    }
    return p;
 #endif
 }

◆ getSizeOfElevCell()

ossimIpt ossimSrtmHandler::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 379 of file ossimSrtmHandler.cpp.

References m_numberOfLines, and m_numberOfSamples.

 {
    return ossimIpt(m_numberOfSamples, m_numberOfLines);
 }

◆ isOpen()

bool ossimSrtmHandler::isOpen ( ) const

virtual

Definition at line 405 of file ossimSrtmHandler.cpp.

References m_fileStrMutex, m_memoryMap, and m_streamOpen.

Referenced by getHeightAboveMSL(), and ossimSrtmHandler().

 {
    if(!m_memoryMap.empty()) return true;
    
    std::lock_guard<std::mutex> lock(m_fileStrMutex);
    return m_streamOpen;
    // return (m_fileStr.is_open());
 }

◆ open()

bool ossimSrtmHandler::open	(	const ossimFilename &	file,
		bool	memoryMapFlag = `false`
	)

virtual

Opens a stream to the srtm cell.

Returns: Returns true on success, false on error.

Reimplemented from ossimElevCellHandler.

Definition at line 415 of file ossimSrtmHandler.cpp.

Referenced by ossimSrtmElevationDatabase::createCell(), and dup().

 {
    theFilename = file;
    clearErrorStatus();
    if (!m_supportData.setFilename(file, false) )
    {
       theErrorStatus = ossimErrorCodes::OSSIM_ERROR;
       return false;
    }
    if(m_swapper) {delete m_swapper;m_swapper=0;}
    m_scalarType = m_supportData.getScalarType();
    // SRTM is stored in big endian.
    if ( ossim::byteOrder() == OSSIM_LITTLE_ENDIAN)
    {
       m_swapper = new ossimEndian();
    }
    m_streamOpen = false;
    m_numberOfLines         = m_supportData.getNumberOfLines();
    m_numberOfSamples       = m_supportData.getNumberOfSamples();
    m_srtmRecordSizeInBytes = m_numberOfSamples * ossim::scalarSizeInBytes(m_scalarType);
    m_latSpacing            = m_supportData.getLatitudeSpacing();
    m_lonSpacing            = m_supportData.getLongitudeSpacing();
    m_nwCornerPost.lon      = m_supportData.getSouthwestLongitude();
    m_nwCornerPost.lat      = m_supportData.getSouthwestLatitude()+1.0;
    m_scalarType            = m_supportData.getScalarType();
    theGroundRect = ossimGrect(ossimGpt(m_nwCornerPost.lat,
                                        m_nwCornerPost.lon,
                                        0.0),
                               ossimGpt(m_nwCornerPost.lat-1.0,
                                        m_nwCornerPost.lon+1.0,
                                        0.0));
    theMeanSpacing = (m_latSpacing*ossimGpt().metersPerDegree().y);
    
    // Set the base class null height value.
    theNullHeightValue = -32768.0;
 
    m_fileStr.clear();
    m_fileStr.open(theFilename.c_str(), std::ios::in | std::ios::binary);
    if(!m_fileStr)
    {
       return false;
    }
    
    if(memoryMapFlag)
    {
       m_memoryMap.resize(theFilename.fileSize());
       m_fileStr.read((char*)&m_memoryMap.front(), (streamsize)m_memoryMap.size());
       m_fileStr.close();
    }
    m_streamOpen = true;
    // Capture the stream state for non-const is_open on old compiler.
    
    return m_streamOpen;
 #if 0
    // theMinHeightAboveMSL;
    // theMaxHeightAboveMSL;
    if(theFileStr.valid())
    {
       if(!m_fileStr.fail())
       {
          return true;
       }
    }
    theFileStr = 0;
 
    
    theFileStr = ossimStreamFactoryRegistry::instance()->createNewIFStream(theFilename,
                                                                           std::ios::in | std::ios::binary);   
 
    if(theFileStr.valid())
    {
       return (!m_fileStr.fail());
    }
    return false;
 #endif
 }

Member Data Documentation

◆ m_fileStr

std::ifstream ossimSrtmHandler::m_fileStr

protected

Definition at line 89 of file ossimSrtmHandler.h.

Referenced by close(), getHeightAboveMSLFileTemplate(), open(), and ossimSrtmHandler().

◆ m_fileStrMutex

std::mutex ossimSrtmHandler::m_fileStrMutex

mutableprotected

Definition at line 88 of file ossimSrtmHandler.h.

Referenced by getHeightAboveMSLFileTemplate(), and isOpen().

◆ m_latSpacing

double ossimSrtmHandler::m_latSpacing

protected

Definition at line 97 of file ossimSrtmHandler.h.

Referenced by getHeightAboveMSLFileTemplate(), getHeightAboveMSLMemoryTemplate(), and open().

◆ m_lonSpacing

double ossimSrtmHandler::m_lonSpacing

protected

Definition at line 98 of file ossimSrtmHandler.h.

Referenced by getHeightAboveMSLFileTemplate(), getHeightAboveMSLMemoryTemplate(), and open().

◆ m_memoryMap

std::vector<ossim_int8> ossimSrtmHandler::m_memoryMap

mutableprotected

Definition at line 103 of file ossimSrtmHandler.h.

Referenced by close(), getHeightAboveMSL(), getHeightAboveMSLMemoryTemplate(), isOpen(), open(), and ossimSrtmHandler().

◆ m_numberOfLines

ossim_int32 ossimSrtmHandler::m_numberOfLines

protected

Definition at line 94 of file ossimSrtmHandler.h.

Referenced by getHeightAboveMSLFileTemplate(), getHeightAboveMSLMemoryTemplate(), getSizeOfElevCell(), and open().

◆ m_numberOfSamples

ossim_int32 ossimSrtmHandler::m_numberOfSamples

protected

Definition at line 95 of file ossimSrtmHandler.h.

Referenced by getHeightAboveMSLFileTemplate(), getHeightAboveMSLMemoryTemplate(), getSizeOfElevCell(), and open().

◆ m_nwCornerPost

ossimDpt ossimSrtmHandler::m_nwCornerPost

protected

Definition at line 99 of file ossimSrtmHandler.h.

Referenced by getHeightAboveMSLFileTemplate(), getHeightAboveMSLMemoryTemplate(), and open().

◆ m_scalarType

ossimScalarType ossimSrtmHandler::m_scalarType

protected

Definition at line 101 of file ossimSrtmHandler.h.

Referenced by getHeightAboveMSL(), and open().

◆ m_srtmRecordSizeInBytes

ossim_int32 ossimSrtmHandler::m_srtmRecordSizeInBytes

protected

Definition at line 96 of file ossimSrtmHandler.h.

Referenced by getHeightAboveMSLFileTemplate(), getHeightAboveMSLMemoryTemplate(), and open().

◆ m_streamOpen

bool ossimSrtmHandler::m_streamOpen

protected

true if stream is open.

Definition at line 92 of file ossimSrtmHandler.h.

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

◆ m_supportData

ossimSrtmSupportData ossimSrtmHandler::m_supportData

protected

Definition at line 87 of file ossimSrtmHandler.h.

Referenced by open().

◆ m_swapper

ossimEndian* ossimSrtmHandler::m_swapper

protected

Definition at line 100 of file ossimSrtmHandler.h.

Referenced by getHeightAboveMSLFileTemplate(), getHeightAboveMSLMemoryTemplate(), open(), and ~ossimSrtmHandler().

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

Public Types

Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Member Enumeration Documentation

◆ anonymous enum

Constructor & Destructor Documentation

◆ ossimSrtmHandler() [1/2]

◆ ossimSrtmHandler() [2/2]

◆ ~ossimSrtmHandler()

Member Function Documentation

◆ close()

◆ dup()

◆ getHeightAboveMSL()

◆ getHeightAboveMSLFileTemplate()

◆ getHeightAboveMSLMemoryTemplate()

◆ getPostValue()

◆ getSizeOfElevCell()

◆ isOpen()

◆ open()

Member Data Documentation

◆ m_fileStr

◆ m_fileStrMutex

◆ m_latSpacing

◆ m_lonSpacing

◆ m_memoryMap

◆ m_numberOfLines

◆ m_numberOfSamples

◆ m_nwCornerPost

◆ m_scalarType

◆ m_srtmRecordSizeInBytes

◆ m_streamOpen

◆ m_supportData

◆ m_swapper