rave_transform.h File Reference

Transformation routines. More...

#include "rave_types.h"
#include "rave_proj.h"

Go to the source code of this file.

Classes
struct	RaveTransform2D
	Data structure when working with 2D projections. More...
struct	RaveWeight2D
	Weight for one item. More...
struct	TransformWeight
	All weights that should be used for calculating a value of a position. More...
struct	RavePolarField
	Defines one field in a volume. More...
struct	RavePolarVolume
	Defines one polar volume. More...

Functions
double	get_array_item_2d (unsigned char *data, int x, int y, RaveDataType type, int stride_xsize)
	Gets the value at position x,y from the data field.
void	set_array_item_2d (unsigned char *data, int x, int y, double v, RaveDataType type, int stride_xsize)
	Sets the value at position x,y in the data field.
double	get_array_item_3d (RavePolarVolume *pvol, int e, int r, int a)
	Gets a value from a polar volume.
void	set_array_item_3d (RavePolarVolume *pvol, int e, int r, int a, double v)
	Sets a value in a polar volume.
TransformWeight *	init_tw (int noi)
	Creates a TransformWeight struct with noi number of weights allocated.
void	free_tw (TransformWeight *v)
	Deallocates the whole TransformWeight struct v, including the weights allocated.
TransformWeight *	get_nearest_weights_2d (int x, int y, UV here_s, RaveTransform2D *tw)
	Gets the weight for the pixel closest to here_s and .
TransformWeight *	get_bilinear_weights_2d (int x, int y, UV here_s, RaveTransform2D *tw)
	Gets the bilinear weights for the pixel surrounding here_s.
TransformWeight *	get_cubic_weights_2d (int x, int y, UV here_s, RaveTransform2D *tw)
	Gets the cubic weights for the pixel surrounding here_s.
TransformWeight *	get_cressman_weights_2d (int x, int y, UV here_s, RaveTransform2D *tw)
	Gets the cressman weights for the pixel surrounding here_s.
TransformWeight *	get_weights_2d (int x, int y, UV here_s, RaveTransform2D *tw)
	Gets the appropriate weights for the current algorithm and position.
double	compute_weights_2d (TransformWeight *tw)
	Evaluates the weights specified in the TransformWeight struct, the weights will be normalized within the function by dividing the given weight with the total_wsum attribute in the TransformWeight struct.

Detailed Description

Transformation routines.

Author

Anders Henja (Swedish Meteorological and Hydrological Institute, SMHI)

Date

2009-08-05

Function Documentation

compute_weights_2d()

double compute_weights_2d

(

TransformWeight *

tw

)

Evaluates the weights specified in the TransformWeight struct, the weights will be normalized within the function by dividing the given weight with the total_wsum attribute in the TransformWeight struct.

Parameters

[in]

tw

the transformation weight(s)

Returns

the computed value

free_tw()

void free_tw

(

TransformWeight *

v

)

Deallocates the whole TransformWeight struct v, including the weights allocated.

Parameters

[in]

v

the structure to be deallocated

get_array_item_2d()

double get_array_item_2d	(	unsigned char *	data,
		int	x,
		int	y,
		RaveDataType	type,
		int	stride_xsize )

Gets the value at position x,y from the data field.

Parameters

[in]	data	the data array
[in]	x	the x position
[in]	y	the y position
[in]	type	the type of the data
[in]	stride_xsize	the stride

get_array_item_3d()

double get_array_item_3d	(	RavePolarVolume *	pvol,
		int	e,
		int	r,
		int	a )

Gets a value from a polar volume.

Parameters

[in]	pvol	the polar volume
[in]	e	the elevation
[in]	r	the range bin
[in]	a	the azimuth

Returns

the value at the specified position

get_bilinear_weights_2d()

TransformWeight * get_bilinear_weights_2d	(	int	x,
		int	y,
		UV	here_s,
		RaveTransform2D *	tw )

Gets the bilinear weights for the pixel surrounding here_s.

Parameters

[in]	x	position in the out projection (only used for debugging)
[in]	y	position in the out projection (only used for debugging)
[in]	here_s	the pixel
[in]	tw	the transformation structure

Returns

the weight(s)

get_cressman_weights_2d()

TransformWeight * get_cressman_weights_2d	(	int	x,
		int	y,
		UV	here_s,
		RaveTransform2D *	tw )

Gets the cressman weights for the pixel surrounding here_s.

Parameters

[in]	x	position in the out projection (only used for debugging)
[in]	y	position in the out projection (only used for debugging)
[in]	here_s	the pixel
[in]	tw	the transformation structure

Returns

the weight(s)

get_cubic_weights_2d()

TransformWeight * get_cubic_weights_2d	(	int	x,
		int	y,
		UV	here_s,
		RaveTransform2D *	tw )

Gets the cubic weights for the pixel surrounding here_s.

Parameters

[in]	x	position in the out projection (only used for debugging)
[in]	y	position in the out projection (only used for debugging)
[in]	here_s	the pixel
[in]	tw	the transformation structure

Returns

the weight(s)

get_nearest_weights_2d()

TransformWeight * get_nearest_weights_2d	(	int	x,
		int	y,
		UV	here_s,
		RaveTransform2D *	tw )

Gets the weight for the pixel closest to here_s and .

Parameters

[in]	x	position in the out projection (only used for debugging)
[in]	y	position in the out projection (only used for debugging)
[in]	here_s	the pixel
[in]	tw	the transformation structure

Returns

the weight(s)

get_weights_2d()

TransformWeight * get_weights_2d	(	int	x,
		int	y,
		UV	here_s,
		RaveTransform2D *	tw )

Gets the appropriate weights for the current algorithm and position.

Parameters

[in]	x	position in the out projection (only used for debugging)
[in]	y	position in the out projection (only used for debugging)
[in]	here_s	the pixel
[in]	tw	the transformation structure.

Returns

the weight(s)

init_tw()

TransformWeight * init_tw

(

int

noi

)

Creates a TransformWeight struct with noi number of weights allocated.

Parameters

[in]

noi

the number of weights to be allocated

Returns

a TransformWeight struct with an array of weights allocated

set_array_item_2d()

void set_array_item_2d	(	unsigned char *	data,
		int	x,
		int	y,
		double	v,
		RaveDataType	type,
		int	stride_xsize )

Sets the value at position x,y in the data field.

Parameters

[in]	data	the data array
[in]	x	the x position
[in]	y	the y position
[in]	v	the value that will be converted into the specified type
[in]	type	the type of the data
[in]	stride_xsize	the stride

set_array_item_3d()

void set_array_item_3d	(	RavePolarVolume *	pvol,
		int	e,
		int	r,
		int	a,
		double	v )

Sets a value in a polar volume.

Parameters

[in]	pvol	the polar volume
[in]	e	the elevation
[in]	r	the range bin
[in]	a	the azimuth
[in]	v	the value to be set