get_proj.c File Reference

GProj library - Functions for re-projecting point data. More...

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <math.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/gprojects.h>
#include <grass/glocale.h>

Include dependency graph for get_proj.c:

Go to the source code of this file.

Macros
#define	FINDERFUNC   set_proj_share
#define	PERMANENT   "PERMANENT"
#define	MAX_PARGS   100

Functions
int	pj_get_kv (struct pj_info *info, const struct Key_Value *in_proj_keys, const struct Key_Value *in_units_keys)
	Create a pj_info struct Co-ordinate System definition from a set of PROJ_INFO / PROJ_UNITS-style key-value pairs. More...
int	pj_get_string (struct pj_info *info, char *str)
	Create a pj_info struct Co-ordinate System definition from a string with a sequence of key=value pairs. More...
const char *	set_proj_share (const char *name)
int	pj_print_proj_params (const struct pj_info *iproj, const struct pj_info *oproj)
	Print projection parameters as used by PROJ.4 for input and output co-ordinate systems. More...

Detailed Description

GProj library - Functions for re-projecting point data.

Author

Original Author unknown, probably Soil Conservation Service, Eric Miller, Paul Kelly, Markus Metz

(C) 2003-2008, 2018 by the GRASS Development Team

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Definition in file get_proj.c.

Macro Definition Documentation

FINDERFUNC

#define FINDERFUNC   set_proj_share

Definition at line 27 of file get_proj.c.

MAX_PARGS

#define MAX_PARGS   100

Definition at line 29 of file get_proj.c.

PERMANENT

#define PERMANENT   "PERMANENT"

Definition at line 28 of file get_proj.c.

Function Documentation

pj_get_kv()

int pj_get_kv	(	struct pj_info *	info,
		const struct Key_Value *	in_proj_keys,
		const struct Key_Value *	in_units_keys
	)

Create a pj_info struct Co-ordinate System definition from a set of PROJ_INFO / PROJ_UNITS-style key-value pairs.

This function takes a GRASS-style co-ordinate system definition as stored in the PROJ_INFO and PROJ_UNITS files and processes it to create a pj_info representation for use in re-projecting with pj_do_proj(). In addition to the parameters passed to it it may also make reference to the system ellipse.table and datum.table files if necessary.

Parameters

info	Pointer to a pj_info struct (which must already exist) into which the co-ordinate system definition will be placed
in_proj_keys	PROJ_INFO-style key-value pairs
in_units_keys	PROJ_UNITS-style key-value pairs

Returns

-1 on error (unable to initialise PROJ.4) 2 if "default" 3-parameter datum shift values from datum.table were used 3 if an unrecognised datum name was passed on to PROJ.4 (and initialization was successful) 1 otherwise

Definition at line 61 of file get_proj.c.

pj_get_string()

int pj_get_string	(	struct pj_info *	info,
		char *	str
	)

Create a pj_info struct Co-ordinate System definition from a string with a sequence of key=value pairs.

This function takes a GRASS- or PROJ style co-ordinate system definition and processes it to create a pj_info representation for use in re-projecting with pj_do_proj(). In addition to the parameters passed to it it may also make reference to the system ellipse.table and datum.table files if necessary.

Parameters

info	Pointer to a pj_info struct (which must already exist) into which the co-ordinate system definition will be placed
str	input string with projection definition
in_units_keys	PROJ_UNITS-style key-value pairs

Returns

-1 on error (unable to initialise PROJ.4) 1 on success

Definition at line 331 of file get_proj.c.

pj_print_proj_params()

int pj_print_proj_params	(	const struct pj_info *	iproj,
		const struct pj_info *	oproj
	)

Print projection parameters as used by PROJ.4 for input and output co-ordinate systems.

Parameters

iproj	'Input' co-ordinate system
oproj	'Output' co-ordinate system

Returns

1 on success, -1 on error (i.e. if the PROJ-style definition is NULL for either co-ordinate system)

Definition at line 532 of file get_proj.c.

References _, pj_info::def, pj_info::meters, and NULL.

set_proj_share()

const char* set_proj_share

(

const char *

name

)

Definition at line 496 of file get_proj.c.

References G_free(), G_malloc, getenv(), and NULL.