gprojects.h

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/******************************************************************************
 *
 * MODULE:       gproj library
 * AUTHOR(S):    Original Author unknown, probably Soil Conservation Service
 *               Paul Kelly
 * PURPOSE:      Include file for GRASS modules that use the PROJ
 *               wrapper functions
 * SPDX-FileCopyrightText: 2003 GRASS Development Team
 * SPDX-License-Identifier: GPL-2.0-or-later
 *
 *****************************************************************************/
 
#ifndef GRASS_GPROJECTS_H
#define GRASS_GPROJECTS_H
 
#include <grass/config.h>
 
#include <ogr_srs_api.h>
 
/* TODO: clean up support for PROJ 5+ */
#include <proj.h>
#define RAD_TO_DEG 57.295779513082321
#define DEG_TO_RAD .017453292519943296
 
#ifndef PJ_WKT2_LATEST
/* update if new PROJ versions support new WKT2 standards */
#define PJ_WKT2_LATEST PJ_WKT2_2019
#endif
 
/* Data Files */
#define ELLIPSOIDTABLE      "/etc/proj/ellipse.table"
#define DATUMTABLE          "/etc/proj/datum.table"
#define DATUMTRANSFORMTABLE "/etc/proj/datumtransform.table"
/* GRASS relative location of datum conversion lookup tables */
#define GRIDDIR             "/etc/proj/nad"
 
/* TODO: rename pj_ to gpj_ to avoid symbol clash with PROJ lib */
struct pj_info {
    PJ *pj;
    double meters;
    int zone;
    char proj[100];
    char *def;
    char *srid;
    char *wkt;
};
 
struct gpj_datum {
    char *name, *longname, *ellps;
    double dx, dy, dz;
};
 
/* no longer needed with PROJ6+ */
struct gpj_datum_transform_list {
 
    int count; /**< Transform Number (ordered list) */
 
    char *params; /**< PROJ.4-style datum transform parameters */
 
    char *where_used; /**< Comment text describing where (geographically)
                       * the transform is valid */
 
    char *comment; /**< Additional Comments */
 
    struct gpj_datum_transform_list
        *next; /**< Pointer to next set of
                * transform parameters in linked list */
};
 
struct gpj_ellps {
    char *name, *longname;
    double a, es, rf;
};
 
#include <grass/defs/gprojects.h>
 
#endif