source: grass/trunk/lib/proj/convert.c

Last change on this file was 74191, checked in by mmetz, 5 years ago

libproj: use proj_create_crs_to_crs() if possible
  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id
  • Property svn:mime-type set to text/x-csrc
File size: 35.4 KB
Line 
1
2/*!
3 \file lib/proj/convert.c
4
5 \brief GProj Library - Functions for manipulating co-ordinate
6 system representations
7
8 (C) 2003-2018 by the GRASS Development Team
9
10 This program is free software under the GNU General Public License
11 (>=v2). Read the file COPYING that comes with GRASS for details.
12
13 \author Paul Kelly, Frank Warmerdam, Markus Metz
14*/
15
16#include <grass/config.h>
17
18#include <stdio.h>
19#include <stdlib.h>
20#include <string.h>
21#include <math.h>
22#include <grass/gis.h>
23#include <grass/gprojects.h>
24#include <grass/glocale.h>
25
26#ifdef HAVE_OGR
27#include <cpl_csv.h>
28#include "local_proto.h"
29
30/* GRASS relative location of OGR co-ordinate system lookup tables */
31#define CSVDIR "/etc/proj/ogr_csv"
32
33static void DatumNameMassage(char **);
34#endif
35
36/* from proj-5.0.0/src/pj_units.c */
37struct gpj_units {
38 char *id; /* units keyword */
39 char *to_meter; /* multiply by value to get meters */
40 char *name; /* comments */
41 double factor; /* to_meter factor in actual numbers */
42};
43
44struct gpj_units
45gpj_units[] = {
46 {"km", "1000.", "Kilometer", 1000.0},
47 {"m", "1.", "Meter", 1.0},
48 {"dm", "1/10", "Decimeter", 0.1},
49 {"cm", "1/100", "Centimeter", 0.01},
50 {"mm", "1/1000", "Millimeter", 0.001},
51 {"kmi", "1852.0", "International Nautical Mile", 1852.0},
52 {"in", "0.0254", "International Inch", 0.0254},
53 {"ft", "0.3048", "International Foot", 0.3048},
54 {"yd", "0.9144", "International Yard", 0.9144},
55 {"mi", "1609.344", "International Statute Mile", 1609.344},
56 {"fath", "1.8288", "International Fathom", 1.8288},
57 {"ch", "20.1168", "International Chain", 20.1168},
58 {"link", "0.201168", "International Link", 0.201168},
59 {"us-in", "1./39.37", "U.S. Surveyor's Inch", 0.0254},
60 {"us-ft", "0.304800609601219", "U.S. Surveyor's Foot", 0.304800609601219},
61 {"us-yd", "0.914401828803658", "U.S. Surveyor's Yard", 0.914401828803658},
62 {"us-ch", "20.11684023368047", "U.S. Surveyor's Chain", 20.11684023368047},
63 {"us-mi", "1609.347218694437", "U.S. Surveyor's Statute Mile", 1609.347218694437},
64 {"ind-yd", "0.91439523", "Indian Yard", 0.91439523},
65 {"ind-ft", "0.30479841", "Indian Foot", 0.30479841},
66 {"ind-ch", "20.11669506", "Indian Chain", 20.11669506},
67 {NULL, NULL, NULL, 0.0}
68};
69
70static char *grass_to_wkt(const struct Key_Value *proj_info,
71 const struct Key_Value *proj_units,
72 const struct Key_Value *proj_epsg,
73 int esri_style, int prettify)
74{
75#ifdef HAVE_OGR
76 OGRSpatialReferenceH hSRS;
77 char *wkt, *local_wkt;
78
79 hSRS = GPJ_grass_to_osr2(proj_info, proj_units, proj_epsg);
80
81 if (hSRS == NULL)
82 return NULL;
83
84 if (esri_style)
85 OSRMorphToESRI(hSRS);
86
87 if (prettify)
88 OSRExportToPrettyWkt(hSRS, &wkt, 0);
89 else
90 OSRExportToWkt(hSRS, &wkt);
91
92 local_wkt = G_store(wkt);
93 CPLFree(wkt);
94 OSRDestroySpatialReference(hSRS);
95
96 return local_wkt;
97#else
98 G_warning(_("GRASS is not compiled with OGR support"));
99 return NULL;
100#endif
101}
102
103/*!
104 * \brief Converts a GRASS co-ordinate system representation to WKT style.
105 *
106 * Takes a GRASS co-ordinate system as specified by two sets of
107 * key/value pairs derived from the PROJ_INFO and PROJ_UNITS files,
108 * and converts it to the 'Well Known Text' format.
109 *
110 * \param proj_info Set of GRASS PROJ_INFO key/value pairs
111 * \param proj_units Set of GRASS PROJ_UNIT key/value pairs
112 * \param esri_style boolean Output ESRI-style WKT (Use OSRMorphToESRI()
113 * function provided by OGR library)
114 * \param prettify boolean Use linebreaks and indents to 'prettify' output
115 * WKT string (Use OSRExportToPrettyWkt() function in OGR)
116 *
117 * \return Pointer to a string containing the co-ordinate system in
118 * WKT format
119 * \return NULL on error
120 */
121char *GPJ_grass_to_wkt(const struct Key_Value *proj_info,
122 const struct Key_Value *proj_units,
123 int esri_style, int prettify)
124{
125 return grass_to_wkt(proj_info, proj_units, NULL, esri_style, prettify);
126}
127
128/*!
129 * \brief Converts a GRASS co-ordinate system representation to WKT
130 * style. EPSG code is preferred if available.
131 *
132 * Takes a GRASS co-ordinate system as specified key/value pairs
133 * derived from the PROJ_EPSG file. TOWGS84 parameter is scanned
134 * from PROJ_INFO file and appended to co-ordinate system definition
135 * imported from EPSG code by GDAL library. PROJ_UNITS file is
136 * ignored. The function converts it to the 'Well Known Text' format.
137 *
138 * \todo Merge with GPJ_grass_to_wkt() in GRASS 8.
139 *
140 * \param proj_info Set of GRASS PROJ_INFO key/value pairs
141 * \param proj_units Set of GRASS PROJ_UNIT key/value pairs
142 * \param proj_epsg Set of GRASS PROJ_EPSG key/value pairs
143 * \param esri_style boolean Output ESRI-style WKT (Use OSRMorphToESRI()
144 * function provided by OGR library)
145 * \param prettify boolean Use linebreaks and indents to 'prettify' output
146 * WKT string (Use OSRExportToPrettyWkt() function in OGR)
147 *
148 * \return Pointer to a string containing the co-ordinate system in
149 * WKT format
150 * \return NULL on error
151 */
152char *GPJ_grass_to_wkt2(const struct Key_Value *proj_info,
153 const struct Key_Value *proj_units,
154 const struct Key_Value *proj_epsg,
155 int esri_style, int prettify)
156{
157 return grass_to_wkt(proj_info, proj_units, proj_epsg, esri_style, prettify);
158}
159
160#ifdef HAVE_OGR
161/*!
162 * \brief Converts a GRASS co-ordinate system to an OGRSpatialReferenceH object.
163 *
164 * \param proj_info Set of GRASS PROJ_INFO key/value pairs
165 * \param proj_units Set of GRASS PROJ_UNIT key/value pairs
166 *
167 * \return OGRSpatialReferenceH object representing the co-ordinate system
168 * defined by proj_info and proj_units or NULL if it fails
169 */
170OGRSpatialReferenceH GPJ_grass_to_osr(const struct Key_Value * proj_info,
171 const struct Key_Value * proj_units)
172{
173 struct pj_info pjinfo;
174 char *proj4, *proj4mod, *wkt, *modwkt, *startmod, *lastpart;
175 OGRSpatialReferenceH hSRS, hSRS2;
176 OGRErr errcode;
177 struct gpj_datum dstruct;
178 struct gpj_ellps estruct;
179 size_t len;
180 const char *ellpskv, *unit, *unfact;
181 char *ellps, *ellpslong, *datum, *params, *towgs84, *datumlongname,
182 *start, *end;
183 const char *sysname, *osrunit, *osrunfact;
184 double a, es, rf;
185 int haveparams = 0;
186
187 if ((proj_info == NULL) || (proj_units == NULL))
188 return NULL;
189
190 hSRS = OSRNewSpatialReference(NULL);
191
192 /* create PROJ structure from GRASS key/value pairs */
193 if (pj_get_kv(&pjinfo, proj_info, proj_units) < 0) {
194 G_warning(_("Unable parse GRASS PROJ_INFO file"));
195 return NULL;
196 }
197
198 /* fetch the PROJ definition */
199 /* TODO: get the PROJ definition as used by pj_get_kv() */
200 if ((proj4 = pjinfo.def) == NULL) {
201 G_warning(_("Unable get PROJ.4-style parameter string"));
202 return NULL;
203 }
204#ifdef HAVE_PROJ_H
205 proj_destroy(pjinfo.pj);
206#else
207 pj_free(pjinfo.pj);
208#endif
209
210 unit = G_find_key_value("unit", proj_units);
211 unfact = G_find_key_value("meters", proj_units);
212 if (unfact != NULL && (strcmp(pjinfo.proj, "ll") != 0))
213 G_asprintf(&proj4mod, "%s +to_meter=%s", proj4, unfact);
214 else
215 proj4mod = G_store(proj4);
216
217 /* create GDAL OSR from proj string */
218 if ((errcode = OSRImportFromProj4(hSRS, proj4mod)) != OGRERR_NONE) {
219 G_warning(_("OGR can't parse PROJ.4-style parameter string: "
220 "%s (OGR Error code was %d)"), proj4mod, errcode);
221 return NULL;
222 }
223 G_free(proj4mod);
224
225 /* this messes up PROJCS versus GEOGCS!
226 sysname = G_find_key_value("name", proj_info);
227 if (sysname)
228 OSRSetProjCS(hSRS, sysname);
229 */
230
231 if ((errcode = OSRExportToWkt(hSRS, &wkt)) != OGRERR_NONE) {
232 G_warning(_("OGR can't get WKT-style parameter string "
233 "(OGR Error code was %d)"), errcode);
234 return NULL;
235 }
236
237 ellpskv = G_find_key_value("ellps", proj_info);
238 GPJ__get_ellipsoid_params(proj_info, &a, &es, &rf);
239 haveparams = GPJ__get_datum_params(proj_info, &datum, &params);
240
241 if (ellpskv != NULL)
242 ellps = G_store(ellpskv);
243 else
244 ellps = NULL;
245
246 if ((datum == NULL) || (GPJ_get_datum_by_name(datum, &dstruct) < 0)) {
247 datumlongname = G_store("unknown");
248 if (ellps == NULL)
249 ellps = G_store("unnamed");
250 }
251 else {
252 datumlongname = G_store(dstruct.longname);
253 if (ellps == NULL)
254 ellps = G_store(dstruct.ellps);
255 GPJ_free_datum(&dstruct);
256 }
257 G_debug(3, "GPJ_grass_to_osr: datum: <%s>", datum);
258 G_free(datum);
259 if (GPJ_get_ellipsoid_by_name(ellps, &estruct) > 0) {
260 ellpslong = G_store(estruct.longname);
261 DatumNameMassage(&ellpslong);
262 GPJ_free_ellps(&estruct);
263 }
264 else
265 ellpslong = G_store(ellps);
266
267 startmod = strstr(wkt, "GEOGCS");
268 lastpart = strstr(wkt, "PRIMEM");
269 len = strlen(wkt) - strlen(startmod);
270 wkt[len] = '\0';
271 if (haveparams == 2) {
272 /* Only put datum params into the WKT if they were specifically
273 * specified in PROJ_INFO */
274 char *paramkey, *paramvalue;
275
276 paramkey = strtok(params, "=");
277 paramvalue = params + strlen(paramkey) + 1;
278 if (G_strcasecmp(paramkey, "towgs84") == 0)
279 G_asprintf(&towgs84, ",TOWGS84[%s]", paramvalue);
280 else
281 towgs84 = G_store("");
282 G_free(params);
283 }
284 else
285 towgs84 = G_store("");
286
287 sysname = OSRGetAttrValue(hSRS, "PROJCS", 0);
288 if (sysname == NULL) {
289 /* Not a projected co-ordinate system */
290 start = G_store("");
291 end = G_store("");
292 }
293 else {
294 if ((strcmp(sysname, "unnamed") == 0) &&
295 (G_find_key_value("name", proj_info) != NULL))
296 G_asprintf(&start, "PROJCS[\"%s\",",
297 G_find_key_value("name", proj_info));
298 else
299 start = G_store(wkt);
300
301 osrunit = OSRGetAttrValue(hSRS, "UNIT", 0);
302 osrunfact = OSRGetAttrValue(hSRS, "UNIT", 1);
303
304 if ((unfact == NULL) || (G_strcasecmp(osrunit, "unknown") != 0))
305 end = G_store("");
306 else {
307 char *buff;
308 double unfactf = atof(unfact);
309
310 G_asprintf(&buff, ",UNIT[\"%s\",", osrunit);
311
312 startmod = strstr(lastpart, buff);
313 len = strlen(lastpart) - strlen(startmod);
314 lastpart[len] = '\0';
315 G_free(buff);
316
317 if (unit == NULL)
318 unit = "unknown";
319 G_asprintf(&end, ",UNIT[\"%s\",%.16g]]", unit, unfactf);
320 }
321
322 }
323 OSRDestroySpatialReference(hSRS);
324 G_asprintf(&modwkt,
325 "%sGEOGCS[\"%s\",DATUM[\"%s\",SPHEROID[\"%s\",%.16g,%.16g]%s],%s%s",
326 start, ellps, datumlongname, ellpslong, a, rf, towgs84,
327 lastpart, end);
328 hSRS2 = OSRNewSpatialReference(modwkt);
329 G_free(modwkt);
330
331 CPLFree(wkt);
332 G_free(start);
333 G_free(ellps);
334 G_free(datumlongname);
335 G_free(ellpslong);
336 G_free(towgs84);
337 G_free(end);
338
339 return hSRS2;
340}
341
342/*!
343 * \brief Converts a GRASS co-ordinate system to an
344 * OGRSpatialReferenceH object. EPSG code is preferred if available.
345 *
346 * The co-ordinate system definition is imported from EPSG (by GDAL)
347 * definition if available. TOWGS84 parameter is scanned from
348 * PROJ_INFO file and appended to co-ordinate system definition. If
349 * EPSG code is not available, PROJ_INFO file is used as
350 * GPJ_grass_to_osr() does.
351
352 * \todo Merge with GPJ_grass_to_osr() in GRASS 8.
353 *
354 * \param proj_info Set of GRASS PROJ_INFO key/value pairs
355 * \param proj_units Set of GRASS PROJ_UNIT key/value pairs
356 * \param proj_epsg Set of GRASS PROJ_EPSG key/value pairs
357 *
358 * \return OGRSpatialReferenceH object representing the co-ordinate system
359 * defined by proj_info and proj_units or NULL if it fails
360 */
361OGRSpatialReferenceH GPJ_grass_to_osr2(const struct Key_Value * proj_info,
362 const struct Key_Value * proj_units,
363 const struct Key_Value * proj_epsg)
364{
365 int epsgcode = 0;
366
367 if (proj_epsg) {
368 const char *epsgstr = G_find_key_value("epsg", proj_epsg);
369 if (epsgstr)
370 epsgcode = atoi(epsgstr);
371 }
372
373 if (epsgcode) {
374 const char *towgs84;
375 OGRSpatialReferenceH hSRS;
376
377 hSRS = OSRNewSpatialReference(NULL);
378
379 OSRImportFromEPSG(hSRS, epsgcode);
380
381 /* take +towgs84 from projinfo file if defined */
382 towgs84 = G_find_key_value("towgs84", proj_info);
383 if (towgs84) {
384 char **tokens;
385 int i;
386 double df[] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0};
387
388 tokens = G_tokenize(towgs84, ",");
389
390 for (i = 0; i < G_number_of_tokens(tokens); i++)
391 df[i] = atof(tokens[i]);
392 G_free_tokens(tokens);
393
394 OSRSetTOWGS84(hSRS, df[0], df[1], df[2], df[3], df[4], df[5], df[6]);
395 }
396
397 return hSRS;
398 }
399
400 return GPJ_grass_to_osr(proj_info, proj_units);
401}
402
403/*!
404 * \brief Converts an OGRSpatialReferenceH object to a GRASS co-ordinate system.
405 *
406 * \param cellhd Pointer to a GRASS Cell_head structure that will have its
407 * projection-related members populated with appropriate values
408 * \param projinfo Pointer to a pointer which will have a GRASS Key_Value
409 * structure allocated containing a set of GRASS PROJ_INFO values
410 * \param projunits Pointer to a pointer which will have a GRASS Key_Value
411 * structure allocated containing a set of GRASS PROJ_UNITS values
412 * \param hSRS OGRSpatialReferenceH object containing the co-ordinate
413 * system to be converted
414 * \param datumtrans Index number of datum parameter set to use, 0 to leave
415 * unspecified
416 *
417 * \return 2 if a projected or lat/long co-ordinate system has been
418 * defined
419 * \return 1 if an unreferenced XY co-ordinate system has
420 * been defined
421 */
422int GPJ_osr_to_grass(struct Cell_head *cellhd, struct Key_Value **projinfo,
423 struct Key_Value **projunits, OGRSpatialReferenceH hSRS1,
424 int datumtrans)
425{
426 struct Key_Value *temp_projinfo;
427 char *pszProj4 = NULL, *pszRemaining;
428 char *pszProj = NULL;
429 const char *pszProjCS = NULL;
430 char *datum = NULL;
431 char *proj4_unit = NULL;
432 struct gpj_datum dstruct;
433 const char *ograttr;
434 OGRSpatialReferenceH hSRS;
435
436 *projinfo = NULL;
437 *projunits = NULL;
438
439 hSRS = hSRS1;
440
441 if (hSRS == NULL)
442 goto default_to_xy;
443
444 /* Set finder function for locating OGR csv co-ordinate system tables */
445 /* SetCSVFilenameHook(GPJ_set_csv_loc); */
446
447 /* Hopefully this doesn't do any harm if it wasn't in ESRI format
448 * to start with... */
449 OSRMorphFromESRI(hSRS);
450
451 *projinfo = G_create_key_value();
452
453 /* use proj4 definition from EXTENSION attribute if existing */
454 ograttr = OSRGetAttrValue(hSRS, "EXTENSION", 0);
455 if (ograttr && *ograttr && strcmp(ograttr, "PROJ4") == 0) {
456 ograttr = OSRGetAttrValue(hSRS, "EXTENSION", 1);
457 G_debug(3, "proj4 extension:");
458 G_debug(3, "%s", ograttr);
459
460 if (ograttr && *ograttr) {
461 char *proj4ext;
462 OGRSpatialReferenceH hSRS2;
463
464 hSRS2 = OSRNewSpatialReference(NULL);
465 proj4ext = G_store(ograttr);
466
467 /* test */
468 if (OSRImportFromProj4(hSRS2, proj4ext) != OGRERR_NONE) {
469 G_warning(_("Updating spatial reference with embedded proj4 definition failed. "
470 "Proj4 definition: <%s>"), proj4ext);
471 OSRDestroySpatialReference(hSRS2);
472 }
473 else {
474 /* use new OGR spatial reference defined with embedded proj4 string */
475 /* TODO: replace warning with important_message once confirmed working */
476 G_warning(_("Updating spatial reference with embedded proj4 definition"));
477
478 /* -------------------------------------------------------------------- */
479 /* Derive the user name for the coordinate system. */
480 /* -------------------------------------------------------------------- */
481 pszProjCS = OSRGetAttrValue(hSRS, "PROJCS", 0);
482 if (!pszProjCS)
483 pszProjCS = OSRGetAttrValue(hSRS, "GEOGCS", 0);
484
485 if (pszProjCS) {
486 G_set_key_value("name", pszProjCS, *projinfo);
487 }
488 else if (pszProj) {
489 char path[4095];
490 char name[80];
491
492 /* use name of the projection as name for the coordinate system */
493
494 sprintf(path, "%s/etc/proj/projections", G_gisbase());
495 if (G_lookup_key_value_from_file(path, pszProj, name, sizeof(name)) >
496 0)
497 G_set_key_value("name", name, *projinfo);
498 else
499 G_set_key_value("name", pszProj, *projinfo);
500 }
501
502 /* the original hSRS1 is left as is, ok? */
503 hSRS = hSRS2;
504 }
505 G_free(proj4ext);
506 }
507 }
508
509 /* -------------------------------------------------------------------- */
510 /* Set cellhd for well known coordinate systems. */
511 /* -------------------------------------------------------------------- */
512 if (!OSRIsGeographic(hSRS) && !OSRIsProjected(hSRS))
513 goto default_to_xy;
514
515 if (cellhd) {
516 int bNorth;
517
518 if (OSRIsGeographic(hSRS)) {
519 cellhd->proj = PROJECTION_LL;
520 cellhd->zone = 0;
521 }
522 else if (OSRGetUTMZone(hSRS, &bNorth) != 0) {
523 cellhd->proj = PROJECTION_UTM;
524 cellhd->zone = OSRGetUTMZone(hSRS, &bNorth);
525 if (!bNorth)
526 cellhd->zone *= -1;
527 }
528 else {
529 cellhd->proj = PROJECTION_OTHER;
530 cellhd->zone = 0;
531 }
532 }
533
534 /* -------------------------------------------------------------------- */
535 /* Get the coordinate system definition in PROJ.4 format. */
536 /* -------------------------------------------------------------------- */
537 if (OSRExportToProj4(hSRS, &pszProj4) != OGRERR_NONE)
538 goto default_to_xy;
539
540 /* -------------------------------------------------------------------- */
541 /* Parse the PROJ.4 string into key/value pairs. Do a bit of */
542 /* extra work to "GRASSify" the result. */
543 /* -------------------------------------------------------------------- */
544 temp_projinfo = G_create_key_value();
545
546 /* Create "local" copy of proj4 string so we can modify and free it
547 * using GRASS functions */
548 pszRemaining = G_store(pszProj4);
549 CPLFree(pszProj4);
550 pszProj4 = pszRemaining;
551 while ((pszRemaining = strstr(pszRemaining, "+")) != NULL) {
552 char *pszToken, *pszValue;
553
554 pszRemaining++;
555
556 /* Advance pszRemaining to end of this token[=value] pair */
557 pszToken = pszRemaining;
558 while (*pszRemaining != ' ' && *pszRemaining != '\0')
559 pszRemaining++;
560
561 if (*pszRemaining == ' ') {
562 *pszRemaining = '\0';
563 pszRemaining++;
564 }
565
566 /* parse token, and value */
567 if (strstr(pszToken, "=") != NULL) {
568 pszValue = strstr(pszToken, "=");
569 *pszValue = '\0';
570 pszValue++;
571 }
572 else
573 pszValue = "defined";
574
575 /* projection name */
576 if (G_strcasecmp(pszToken, "proj") == 0) {
577 /* The ll projection is known as longlat in PROJ.4 */
578 if (G_strcasecmp(pszValue, "longlat") == 0)
579 pszValue = "ll";
580
581 pszProj = pszValue;
582 }
583
584 /* discard @null nadgrids */
585 if (G_strcasecmp(pszToken, "nadgrids") == 0 &&
586 G_strcasecmp(pszValue, "@null") == 0)
587 continue;
588
589 /* Ellipsoid and datum handled separately below */
590 if (G_strcasecmp(pszToken, "ellps") == 0
591 || G_strcasecmp(pszToken, "a") == 0
592 || G_strcasecmp(pszToken, "b") == 0
593 || G_strcasecmp(pszToken, "es") == 0
594 || G_strcasecmp(pszToken, "rf") == 0
595 || G_strcasecmp(pszToken, "datum") == 0)
596 continue;
597
598 /* We will handle units separately */
599 if (G_strcasecmp(pszToken, "to_meter") == 0)
600 continue;
601
602 if (G_strcasecmp(pszToken, "units") == 0) {
603 proj4_unit = G_store(pszValue);
604 continue;
605 }
606
607 G_set_key_value(pszToken, pszValue, temp_projinfo);
608 }
609 if (!pszProj)
610 G_warning(_("No projection name! Projection parameters likely to be meaningless."));
611
612 /* -------------------------------------------------------------------- */
613 /* Derive the user name for the coordinate system. */
614 /* -------------------------------------------------------------------- */
615 if (!G_find_key_value("name", *projinfo)) {
616 pszProjCS = OSRGetAttrValue(hSRS, "PROJCS", 0);
617 if (!pszProjCS)
618 pszProjCS = OSRGetAttrValue(hSRS, "GEOGCS", 0);
619
620 if (pszProjCS) {
621 G_set_key_value("name", pszProjCS, *projinfo);
622 }
623 else if (pszProj) {
624 char path[4095];
625 char name[80];
626
627 /* use name of the projection as name for the coordinate system */
628
629 sprintf(path, "%s/etc/proj/projections", G_gisbase());
630 if (G_lookup_key_value_from_file(path, pszProj, name, sizeof(name)) >
631 0)
632 G_set_key_value("name", name, *projinfo);
633 else
634 G_set_key_value("name", pszProj, *projinfo);
635 }
636 }
637
638 /* -------------------------------------------------------------------- */
639 /* Find the GRASS datum name and choose parameters either */
640 /* interactively or not. */
641 /* -------------------------------------------------------------------- */
642
643 {
644 const char *pszDatumNameConst = OSRGetAttrValue(hSRS, "DATUM", 0);
645 struct datum_list *list, *listhead;
646 char *dum1, *dum2, *pszDatumName;
647 int paramspresent =
648 GPJ__get_datum_params(temp_projinfo, &dum1, &dum2);
649
650 if (pszDatumNameConst) {
651 /* Need to make a new copy of the string so we don't mess
652 * around with the memory inside the OGRSpatialReferenceH? */
653
654 pszDatumName = G_store(pszDatumNameConst);
655 DatumNameMassage(&pszDatumName);
656 G_debug(3, "GPJ_osr_to_grass: pszDatumNameConst: <%s>", pszDatumName);
657
658 list = listhead = read_datum_table();
659
660 while (list != NULL) {
661 if (G_strcasecmp(pszDatumName, list->longname) == 0) {
662 datum = G_store(list->name);
663 break;
664 }
665 list = list->next;
666 }
667 free_datum_list(listhead);
668
669 if (datum == NULL) {
670 if (paramspresent < 2)
671 /* Only give warning if no parameters present */
672 G_warning(_("Datum <%s> not recognised by GRASS and no parameters found"),
673 pszDatumName);
674 }
675 else {
676 G_set_key_value("datum", datum, *projinfo);
677
678 if (paramspresent < 2) {
679 /* If no datum parameters were imported from the OSR
680 * object then we should use the set specified by datumtrans */
681 char *params, *chosenparams = NULL;
682 int paramsets;
683
684 paramsets =
685 GPJ_get_default_datum_params_by_name(datum, &params);
686
687 if (paramsets < 0)
688 G_warning(_("Datum <%s> apparently recognised by GRASS but no parameters found. "
689 "You may want to look into this."), datum);
690 else if (datumtrans > paramsets) {
691
692 G_warning(_("Invalid transformation number %d; valid range is 1 to %d. "
693 "Leaving datum transform parameters unspecified."),
694 datumtrans, paramsets);
695 datumtrans = 0;
696 }
697
698 if (paramsets > 0) {
699 struct gpj_datum_transform_list *tlist, *old;
700
701 tlist = GPJ_get_datum_transform_by_name(datum);
702
703 if (tlist != NULL) {
704 do {
705 if (tlist->count == datumtrans)
706 chosenparams = G_store(tlist->params);
707 old = tlist;
708 tlist = tlist->next;
709 GPJ_free_datum_transform(old);
710 } while (tlist != NULL);
711 }
712 }
713
714 if (chosenparams != NULL) {
715 char *paramkey, *paramvalue;
716
717 paramkey = strtok(chosenparams, "=");
718 paramvalue = chosenparams + strlen(paramkey) + 1;
719 G_set_key_value(paramkey, paramvalue, *projinfo);
720 G_free(chosenparams);
721 }
722
723 if (paramsets > 0)
724 G_free(params);
725 }
726
727 }
728 G_free(pszDatumName);
729 }
730 }
731
732 /* -------------------------------------------------------------------- */
733 /* Determine an appropriate GRASS ellipsoid name if possible, or */
734 /* else just put a and es values into PROJ_INFO */
735 /* -------------------------------------------------------------------- */
736
737 if ((datum != NULL) && (GPJ_get_datum_by_name(datum, &dstruct) > 0)) {
738 /* Use ellps name associated with datum */
739 G_set_key_value("ellps", dstruct.ellps, *projinfo);
740 GPJ_free_datum(&dstruct);
741 G_free(datum);
742 }
743 else {
744 /* If we can't determine the ellipsoid from the datum, derive it
745 * directly from "SPHEROID" parameters in WKT */
746 const char *pszSemiMajor = OSRGetAttrValue(hSRS, "SPHEROID", 1);
747 const char *pszInvFlat = OSRGetAttrValue(hSRS, "SPHEROID", 2);
748
749 if (pszSemiMajor != NULL && pszInvFlat != NULL) {
750 char *ellps = NULL;
751 struct ellps_list *list, *listhead;
752 double a = atof(pszSemiMajor), invflat = atof(pszInvFlat), flat;
753 double es;
754
755 /* Allow for incorrect WKT describing a sphere where InvFlat
756 * is given as 0 rather than inf */
757 if (invflat > 0)
758 flat = 1 / invflat;
759 else
760 flat = 0;
761
762 es = flat * (2.0 - flat);
763
764 list = listhead = read_ellipsoid_table(0);
765
766 while (list != NULL) {
767 /* Try and match a and es against GRASS defined ellipsoids;
768 * accept first one that matches. These numbers were found
769 * by trial and error and could be fine-tuned, or possibly
770 * a direct comparison of IEEE floating point values used. */
771 if ((a == list->a || fabs(a - list->a) < 0.1 || fabs(1 - a / list->a) < 0.0000001) &&
772 ((es == 0 && list->es == 0) ||
773 /* Special case for sphere */
774 (invflat == list->rf || fabs(invflat - list->rf) < 0.0000001))) {
775 ellps = G_store(list->name);
776 break;
777 }
778 list = list->next;
779 }
780 if (listhead != NULL)
781 free_ellps_list(listhead);
782
783 if (ellps == NULL) {
784 /* If we weren't able to find a matching ellps name, set
785 * a and es values directly from WKT-derived data */
786 char es_str[100];
787
788 G_set_key_value("a", (char *)pszSemiMajor, *projinfo);
789
790 sprintf(es_str, "%.16g", es);
791 G_set_key_value("es", es_str, *projinfo);
792 }
793 else {
794 /* else specify the GRASS ellps name for readability */
795 G_set_key_value("ellps", ellps, *projinfo);
796 G_free(ellps);
797 }
798
799 }
800
801 }
802
803 /* -------------------------------------------------------------------- */
804 /* Finally append the detailed projection parameters to the end */
805 /* -------------------------------------------------------------------- */
806
807 {
808 int i;
809
810 for (i = 0; i < temp_projinfo->nitems; i++)
811 G_set_key_value(temp_projinfo->key[i],
812 temp_projinfo->value[i], *projinfo);
813
814 G_free_key_value(temp_projinfo);
815 }
816
817 G_free(pszProj4);
818
819 /* -------------------------------------------------------------------- */
820 /* Set the linear units. */
821 /* -------------------------------------------------------------------- */
822 *projunits = G_create_key_value();
823
824 if (OSRIsGeographic(hSRS)) {
825 /* We assume degrees ... someday we will be wrong! */
826 G_set_key_value("unit", "degree", *projunits);
827 G_set_key_value("units", "degrees", *projunits);
828 G_set_key_value("meters", "1.0", *projunits);
829 }
830 else {
831 char szFormatBuf[256];
832 char *pszUnitsName = NULL;
833 double dfToMeters;
834 char *pszUnitsPlural, *pszStringEnd;
835
836 dfToMeters = OSRGetLinearUnits(hSRS, &pszUnitsName);
837
838 /* the unit name can be arbitrary: the following can be the same
839 * us-ft (proj.4 keyword)
840 * U.S. Surveyor's Foot (proj.4 name)
841 * US survey foot (WKT)
842 * Foot_US (WKT)
843 */
844
845 /* Workaround for the most obvious case when unit name is unknown */
846 if ((G_strcasecmp(pszUnitsName, "unknown") == 0) &&
847 (dfToMeters == 1.))
848 G_asprintf(&pszUnitsName, "meter");
849
850 if ((G_strcasecmp(pszUnitsName, "metre") == 0))
851 G_asprintf(&pszUnitsName, "meter");
852 if ((G_strcasecmp(pszUnitsName, "kilometre") == 0))
853 G_asprintf(&pszUnitsName, "kilometer");
854
855 if (dfToMeters != 1. && proj4_unit) {
856 int i;
857
858 i = 0;
859 while (gpj_units[i].id != NULL) {
860 if (strcmp(proj4_unit, gpj_units[i].id) == 0) {
861 G_asprintf(&pszUnitsName, "%s", gpj_units[i].name);
862 break;
863 }
864 i++;
865 }
866 }
867
868 G_set_key_value("unit", pszUnitsName, *projunits);
869
870 /* Attempt at plural formation (WKT format doesn't store plural
871 * form of unit name) */
872 pszUnitsPlural = G_malloc(strlen(pszUnitsName) + 3);
873 strcpy(pszUnitsPlural, pszUnitsName);
874 pszStringEnd = pszUnitsPlural + strlen(pszUnitsPlural) - 4;
875 if (G_strcasecmp(pszStringEnd, "foot") == 0) {
876 /* Special case for foot - change two o's to e's */
877 pszStringEnd[1] = 'e';
878 pszStringEnd[2] = 'e';
879 }
880 else if (G_strcasecmp(pszStringEnd, "inch") == 0) {
881 /* Special case for inch - add es */
882 pszStringEnd[4] = 'e';
883 pszStringEnd[5] = 's';
884 pszStringEnd[6] = '\0';
885 }
886 else {
887 /* For anything else add an s at the end */
888 pszStringEnd[4] = 's';
889 pszStringEnd[5] = '\0';
890 }
891
892 G_set_key_value("units", pszUnitsPlural, *projunits);
893 G_free(pszUnitsPlural);
894
895 sprintf(szFormatBuf, "%.16g", dfToMeters);
896 G_set_key_value("meters", szFormatBuf, *projunits);
897
898 }
899
900 if (hSRS != hSRS1)
901 OSRDestroySpatialReference(hSRS);
902
903 return 2;
904
905 /* -------------------------------------------------------------------- */
906 /* Fallback to returning an ungeoreferenced definition. */
907 /* -------------------------------------------------------------------- */
908 default_to_xy:
909 if (cellhd != NULL) {
910 cellhd->proj = PROJECTION_XY;
911 cellhd->zone = 0;
912 }
913 if (*projinfo)
914 G_free_key_value(*projinfo);
915
916 *projinfo = NULL;
917 *projunits = NULL;
918
919 if (hSRS != NULL && hSRS != hSRS1)
920 OSRDestroySpatialReference(hSRS);
921
922 return 1;
923}
924#endif
925
926/*!
927 * \brief Converts a WKT projection description to a GRASS co-ordinate system.
928 *
929 * \param cellhd Pointer to a GRASS Cell_head structure that will have its
930 * projection-related members populated with appropriate values
931 * \param projinfo Pointer to a pointer which will have a GRASS Key_Value
932 * structure allocated containing a set of GRASS PROJ_INFO values
933 * \param projunits Pointer to a pointer which will have a GRASS Key_Value
934 * structure allocated containing a set of GRASS PROJ_UNITS values
935 * \param wkt Well-known Text (WKT) description of the co-ordinate
936 * system to be converted
937 * \param datumtrans Index number of datum parameter set to use, 0 to leave
938 * unspecified
939 *
940 * \return 2 if a projected or lat/long co-ordinate system has been
941 * defined
942 * \return 1 if an unreferenced XY co-ordinate system has
943 * been defined
944 * \return -1 on error
945 */
946int GPJ_wkt_to_grass(struct Cell_head *cellhd, struct Key_Value **projinfo,
947 struct Key_Value **projunits, const char *wkt,
948 int datumtrans)
949{
950#ifdef HAVE_OGR
951 int retval;
952
953 if (wkt == NULL)
954 retval =
955 GPJ_osr_to_grass(cellhd, projinfo, projunits, NULL, datumtrans);
956 else {
957 OGRSpatialReferenceH hSRS;
958
959 /* Set finder function for locating OGR csv co-ordinate system tables */
960 /* SetCSVFilenameHook(GPJ_set_csv_loc); */
961
962 hSRS = OSRNewSpatialReference(wkt);
963 retval =
964 GPJ_osr_to_grass(cellhd, projinfo, projunits, hSRS, datumtrans);
965 OSRDestroySpatialReference(hSRS);
966 }
967
968 return retval;
969#else
970 return -1;
971#endif
972}
973
974#ifdef HAVE_OGR
975/* GPJ_set_csv_loc()
976 * 'finder function' for use with OGR SetCSVFilenameHook() function */
977
978const char *GPJ_set_csv_loc(const char *name)
979{
980 const char *gisbase = G_gisbase();
981 static char *buf = NULL;
982
983 if (buf != NULL)
984 G_free(buf);
985
986 G_asprintf(&buf, "%s%s/%s", gisbase, CSVDIR, name);
987
988 return buf;
989}
990
991
992/* The list below is only for files that use a non-standard name for a
993 * datum that is already supported in GRASS. The number of entries must be even;
994 * they are all in pairs. The first one in the pair is the non-standard name;
995 * the second is the GRASS/GDAL name. If a name appears more than once (as for
996 * European_Terrestrial_Reference_System_1989) then it means there was more
997 * than one non-standard name for it that needs to be accounted for.
998 *
999 * N.B. The order of these pairs is different from that in
1000 * ogr/ogrfromepsg.cpp in the GDAL source tree! GRASS uses the EPSG
1001 * names in its WKT representation except WGS_1984 and WGS_1972 as
1002 * these shortened versions seem to be standard.
1003 * Below order:
1004 * the equivalent name comes first in the pair, and
1005 * the EPSG name (as used in the GRASS datum.table file) comes second.
1006 *
1007 * The datum parameters are stored in
1008 * ../gis/datum.table # 3 parameters
1009 * ../gis/datumtransform.table # 7 parameters (requires entry in datum.table)
1010 *
1011 * Hint: use GDAL's "testepsg" to identify the canonical name, e.g.
1012 * testepsg epsg:4674
1013 */
1014
1015static const char *papszDatumEquiv[] = {
1016 "Militar_Geographische_Institute",
1017 "Militar_Geographische_Institut",
1018 "World_Geodetic_System_1984",
1019 "WGS_1984",
1020 "World_Geodetic_System_1972",
1021 "WGS_1972",
1022 "European_Terrestrial_Reference_System_89",
1023 "European_Terrestrial_Reference_System_1989",
1024 "European_Reference_System_1989",
1025 "European_Terrestrial_Reference_System_1989",
1026 "ETRS_1989",
1027 "European_Terrestrial_Reference_System_1989",
1028 "ETRS89",
1029 "European_Terrestrial_Reference_System_1989",
1030 "ETRF_1989",
1031 "European_Terrestrial_Reference_System_1989",
1032 "NZGD_2000",
1033 "New_Zealand_Geodetic_Datum_2000",
1034 "Monte_Mario_Rome",
1035 "Monte_Mario",
1036 "MONTROME",
1037 "Monte_Mario",
1038 "Campo_Inchauspe_1969",
1039 "Campo_Inchauspe",
1040 "S_JTSK",
1041 "System_Jednotne_Trigonometricke_Site_Katastralni",
1042 "S_JTSK_Ferro",
1043 "Militar_Geographische_Institut",
1044 "Potsdam_Datum_83",
1045 "Deutsches_Hauptdreiecksnetz",
1046 "South_American_1969",
1047 "South_American_Datum_1969",
1048 "ITRF_1992",
1049 "ITRF92",
1050 NULL
1051};
1052
1053/************************************************************************/
1054/* OGREPSGDatumNameMassage() */
1055/* */
1056/* Massage an EPSG datum name into WMT format. Also transform */
1057/* specific exception cases into WKT versions. */
1058
1059/************************************************************************/
1060
1061static void DatumNameMassage(char **ppszDatum)
1062{
1063 int i, j;
1064 char *pszDatum = *ppszDatum;
1065
1066 G_debug(3, "DatumNameMassage: Raw string found <%s>", (char *)pszDatum);
1067 /* -------------------------------------------------------------------- */
1068 /* Translate non-alphanumeric values to underscores. */
1069 /* -------------------------------------------------------------------- */
1070 for (i = 0; pszDatum[i] != '\0'; i++) {
1071 if (!(pszDatum[i] >= 'A' && pszDatum[i] <= 'Z')
1072 && !(pszDatum[i] >= 'a' && pszDatum[i] <= 'z')
1073 && !(pszDatum[i] >= '0' && pszDatum[i] <= '9')) {
1074 pszDatum[i] = '_';
1075 }
1076 }
1077
1078 /* -------------------------------------------------------------------- */
1079 /* Remove repeated and trailing underscores. */
1080 /* -------------------------------------------------------------------- */
1081 for (i = 1, j = 0; pszDatum[i] != '\0'; i++) {
1082 if (pszDatum[j] == '_' && pszDatum[i] == '_')
1083 continue;
1084
1085 pszDatum[++j] = pszDatum[i];
1086 }
1087 if (pszDatum[j] == '_')
1088 pszDatum[j] = '\0';
1089 else
1090 pszDatum[j + 1] = '\0';
1091
1092 /* -------------------------------------------------------------------- */
1093 /* Search for datum equivalences. Specific massaged names get */
1094 /* mapped to OpenGIS specified names. */
1095 /* -------------------------------------------------------------------- */
1096 G_debug(3, "DatumNameMassage: Search for datum equivalences of <%s>", (char *)pszDatum);
1097 for (i = 0; papszDatumEquiv[i] != NULL; i += 2) {
1098 if (EQUAL(*ppszDatum, papszDatumEquiv[i])) {
1099 G_free(*ppszDatum);
1100 *ppszDatum = G_store(papszDatumEquiv[i + 1]);
1101 break;
1102 }
1103 }
1104}
1105
1106#endif /* HAVE_OGR */
Note: See TracBrowser for help on using the repository browser.