GRASS GIS 8 Programmer's Manual
8.2.2dev(2023)-3d2c704037
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GProj library - Functions for reading datum parameters from the location database. More...
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <grass/gis.h>
#include <grass/glocale.h>
#include <grass/gprojects.h>
#include "local_proto.h"
Go to the source code of this file.
Functions | |
int | GPJ_get_ellipsoid_params (double *a, double *e2, double *rf) |
Get the ellipsoid parameters from the database. More... | |
int | GPJ__get_ellipsoid_params (const struct Key_Value *proj_keys, double *a, double *e2, double *rf) |
Get the ellipsoid parameters from proj keys structure. More... | |
int | GPJ_get_ellipsoid_by_name (const char *name, struct gpj_ellps *estruct) |
Looks up ellipsoid in ellipsoid table and returns the a, e2 parameters for the ellipsoid. More... | |
struct ellps_list * | read_ellipsoid_table (int fatal) |
void | GPJ_free_ellps (struct gpj_ellps *estruct) |
Free ellipsoid data structure. More... | |
void | free_ellps_list (struct ellps_list *elist) |
GProj library - Functions for reading datum parameters from the location database.
(C) 2003-2008 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 ellipse.c.
void free_ellps_list | ( | struct ellps_list * | elist | ) |
Definition at line 316 of file ellipse.c.
References G_free(), and NULL.
Referenced by GPJ_get_ellipsoid_by_name().
int GPJ__get_ellipsoid_params | ( | const struct Key_Value * | proj_keys, |
double * | a, | ||
double * | e2, | ||
double * | rf | ||
) |
Get the ellipsoid parameters from proj keys structure.
If the PROJECTION_FILE exists in the PERMANENT mapset, read info from that file, otherwise return WGS 84 values.
Dies with diagnostic if there is an error.
proj_keys | proj definition | |
[out] | a | semi-major axis |
[out] | e2 | first eccentricity squared |
[out] | rf | reciprocal of the ellipsoid flattening term |
void GPJ_free_ellps | ( | struct gpj_ellps * | estruct | ) |
Free ellipsoid data structure.
estruct | data structure to be freed |
Definition at line 309 of file ellipse.c.
References G_free(), gpj_ellps::longname, and gpj_ellps::name.
int GPJ_get_ellipsoid_by_name | ( | const char * | name, |
struct gpj_ellps * | estruct | ||
) |
Looks up ellipsoid in ellipsoid table and returns the a, e2 parameters for the ellipsoid.
name | ellipsoid name | |
[out] | estruct | ellipsoid |
Definition at line 160 of file ellipse.c.
References gpj_ellps::a, gpj_ellps::es, free_ellps_list(), G_store(), G_strcasecmp(), list, gpj_ellps::longname, gpj_ellps::name, NULL, read_ellipsoid_table(), and gpj_ellps::rf.
int GPJ_get_ellipsoid_params | ( | double * | a, |
double * | e2, | ||
double * | rf | ||
) |
Get the ellipsoid parameters from the database.
If the PROJECTION_FILE exists in the PERMANENT mapset, read info from that file, otherwise return WGS 84 values.
Dies with diagnostic if there is an error.
[out] | a | semi-major axis |
[out] | e2 | first eccentricity squared |
[out] | rf | reciprocal of the ellipsoid flattening term |