VAPoR::Proj4API Class Reference

Wrapper for proj4 C API. More...

#include <Proj4API.h>

Inheritance diagram for VAPoR::Proj4API:

Public Member Functions
	Proj4API ()
	~Proj4API ()
int	Initialize (string srcdef, string dstdef)
int	Transform (double *x, double *y, size_t n, int offset=1) const
int	Transform (double *x, double *y, double *z, size_t n, int offset=1) const
bool	IsLatLonSrc () const
bool	IsLatLonDst () const
bool	IsGeocentSrc () const
bool	IsGeocentDst () const
string	GetSrcStr () const
	Return the current source projection definition string. More...
string	GetDstStr () const
	Return the current destination projection definition string. More...
string	ProjErr () const
Public Member Functions inherited from VetsUtil::MyBase
	MyBase ()
const string &	getClassName () const

Additional Inherited Members
Public Types inherited from VetsUtil::MyBase
typedef void(*	ErrMsgCB_T )(const char *msg, int err_code)
typedef void(*	DiagMsgCB_T )(const char *msg)
Static Public Member Functions inherited from VetsUtil::MyBase
static void	SetErrMsg (const char *format,...)
	Record a formatted error message. More...
static void	SetErrMsg (int errcode, const char *format,...)
	Record a formatted error message and an error code. More...
static const char *	GetErrMsg ()
static void	SetErrCode (int err_code)
	Record an error code. More...
static int	GetErrCode ()
	Retrieve the current error code. More...
static void	SetErrMsgCB (ErrMsgCB_T cb)
static ErrMsgCB_T	GetErrMsgCB ()
static void	SetErrMsgFilePtr (FILE *fp)
static const FILE *	SetErrMsgFilePtr ()
static void	SetDiagMsg (const char *format,...)
	Record a formatted diagnostic message. More...
static const char *	GetDiagMsg ()
static void	SetDiagMsgCB (DiagMsgCB_T cb)
static DiagMsgCB_T	GetDiagMsgCB ()
static void	SetDiagMsgFilePtr (FILE *fp)
static bool	EnableErrMsg (bool enable)
Static Public Attributes inherited from VetsUtil::MyBase
static char *	ErrMsg
static int	ErrCode
static int	ErrMsgSize
static FILE *	ErrMsgFilePtr
static ErrMsgCB_T	ErrMsgCB
static char *	DiagMsg
static int	DiagMsgSize
static FILE *	DiagMsgFilePtr
static DiagMsgCB_T	DiagMsgCB
static bool	Enabled
Protected Member Functions inherited from VetsUtil::MyBase
void	SetClassName (const string &name)

Detailed Description

Wrapper for proj4 C API.

Author

John Clyne

This class provides a convience wrapper for the proj4 Cartographic Projections Library http://trac.osgeo.org/proj/

Definition at line 17 of file Proj4API.h.

Constructor & Destructor Documentation

VAPoR::Proj4API::Proj4API

(

)

VAPoR::Proj4API::~Proj4API

(

)

Member Function Documentation

string VAPoR::Proj4API::GetDstStr

(

)

const

Return the current destination projection definition string.

string VAPoR::Proj4API::GetSrcStr

(

)

const

Return the current source projection definition string.

int VAPoR::Proj4API::Initialize	(	string	srcdef,
		string	dstdef
	)

Initialize the class

Initializes the class with source and destination proj4 transformation strings.

Parameters

[in]	srcdef	The source proj4 transformation definition. If empty, the string "+proj=latlong" is used.
[in]	dstdef	The destintation proj4 transformation definition. If empty, the string "+proj=latlong" is used.

Return values

status

Retruns a negative int on failure

See also

pj_init_plus()

bool VAPoR::Proj4API::IsGeocentDst

(

)

const

bool VAPoR::Proj4API::IsGeocentSrc

(

)

const

bool VAPoR::Proj4API::IsLatLonDst

(

)

const

Return true of destination projection definition is lat-long

This method returns true iff the destination projection definition is geographic (i.e. +proj=latlong). If true, subsequent transforms will return output values in geographic coordinates (i.e. degrees) False is returned otherwise

See also

Initialize(), pj_is_latlong()

bool VAPoR::Proj4API::IsLatLonSrc

(

)

const

Return true of source projection definition is lat-long

This method returns true iff the source projection definition is geographic (i.e. +proj=latlong). If true, subsequent transforms expect input values to be in geographic coordinates (i.e. degrees) False is returned otherwise

See also

Initialize(), pj_is_latlong()

string VAPoR::Proj4API::ProjErr

(

)

const

Return the error string generated by the proj4 C API for the most recent error

See also

pj_strerrno()

int VAPoR::Proj4API::Transform	(	double *	x,
		double *	y,
		size_t	n,
		int	offset = 1
	)		const

Transform coordinates

Transforms coordinates based on defintions of the source and destination proj4 transformation definitions passed to Initialize(). Transformations are performed between Geographic coordinates (latitude and longitude) and Cartographic coordinates (Cartesian) as specified by the transformation definitions. Cartographic coordinates are referred to as the Projection Coordinate System (PCS). Default units for the PCS are meters on the ground. Geographic coordinates are always in degrees.

Note

As with the proj4 C library the transformations are performed in place, modifiying the input values

Parameters

[in,out]	x	array of longitudes or PCS X values
[in,out]	y	array of latitudes or PCS Y values
[in]	n	num elements in x, y, and z
[in]	offset	Offset between adjacent values in the input and output arrays.

Return values

status

Retruns a negative int on failure

See also

Initialize(), pj_transform()

int VAPoR::Proj4API::Transform	(	double *	x,
		double *	y,
		double *	z,
		size_t	n,
		int	offset = 1
	)		const

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

• /Users/clyne/src/vapor/lib/vdf/Proj4API.h