PostGIS  2.5.0dev-r@@SVN_REVISION@@

◆ parse_gml_srs()

static void parse_gml_srs ( xmlNodePtr  xnode,
gmlSrs srs 
)
static

Parse gml srsName attribute.

Definition at line 364 of file lwgeom_in_gml.c.

References gml_is_srid_planar(), gml_lwpgerror(), gmlGetProp(), struct_gmlSrs::reverse_axis, struct_gmlSrs::srid, and SRID_UNKNOWN.

Referenced by parse_gml(), parse_gml_coll(), parse_gml_curve(), parse_gml_data(), parse_gml_line(), parse_gml_linearring(), parse_gml_mcurve(), parse_gml_mline(), parse_gml_mpoint(), parse_gml_mpoly(), parse_gml_msurface(), parse_gml_patch(), parse_gml_point(), parse_gml_polygon(), parse_gml_psurface(), parse_gml_tin(), and parse_gml_triangle().

365 {
366  char *p;
367  int is_planar;
368  xmlNodePtr node;
369  xmlChar *srsname;
370  bool latlon = false;
371  char sep = ':';
372 
373  node = xnode;
374  srsname = gmlGetProp(node, (xmlChar *) "srsName");
375  /*printf("srsname %s\n",srsname);*/
376  if (!srsname)
377  {
378  if (node->parent == NULL)
379  {
380  srs->srid = SRID_UNKNOWN;
381  srs->reverse_axis = false;
382  return;
383  }
384  parse_gml_srs(node->parent, srs);
385  }
386  else
387  {
388  /* Severals srsName formats are available...
389  * cf WFS 1.1.0 -> 9.2 (p36)
390  * cf ISO 19142:2009 -> 7.9.2.4.4 (p34)
391  * cf RFC 5165 <http://tools.ietf.org/html/rfc5165>
392  * cf CITE WFS-1.1 (GetFeature-tc17.2)
393  */
394 
395  /* SRS pattern like: EPSG:4326
396  urn:EPSG:geographicCRS:4326
397  urn:ogc:def:crs:EPSG:4326
398  urn:ogc:def:crs:EPSG::4326
399  urn:ogc:def:crs:EPSG:6.6:4326
400  urn:x-ogc:def:crs:EPSG:6.6:4326
401  http://www.opengis.net/gml/srs/epsg.xml#4326
402  http://www.epsg.org/6.11.2/4326
403  */
404 
405  if (!strncmp((char *) srsname, "EPSG:", 5))
406  {
407  sep = ':';
408  latlon = false;
409  }
410  else if (!strncmp((char *) srsname, "urn:ogc:def:crs:EPSG:", 21)
411  || !strncmp((char *) srsname, "urn:x-ogc:def:crs:EPSG:", 23)
412  || !strncmp((char *) srsname, "urn:EPSG:geographicCRS:", 23))
413  {
414  sep = ':';
415  latlon = true;
416  }
417  else if (!strncmp((char *) srsname,
418  "http://www.opengis.net/gml/srs/epsg.xml#", 40))
419  {
420  sep = '#';
421  latlon = false;
422  }
423  else gml_lwpgerror("unknown spatial reference system", 4);
424 
425  /* retrieve the last ':' or '#' char */
426  for (p = (char *) srsname ; *p ; p++);
427  for (--p ; *p != sep ; p--)
428  if (!isdigit(*p)) gml_lwpgerror("unknown spatial reference system", 5);
429 
430  srs->srid = atoi(++p);
431 
432  /* Check into spatial_ref_sys that this SRID really exist */
433  is_planar = gml_is_srid_planar(srs->srid);
434  if (srs->srid == SRID_UNKNOWN || is_planar == -1)
435  gml_lwpgerror("unknown spatial reference system", 6);
436 
437  /* About lat/lon issue, Cf: http://tinyurl.com/yjpr55z */
438  srs->reverse_axis = !is_planar && latlon;
439 
440  xmlFree(srsname);
441  return;
442  }
443 }
static void gml_lwpgerror(char *msg, __attribute__((__unused__)) int error_code)
Definition: lwgeom_in_gml.c:82
static void parse_gml_srs(xmlNodePtr xnode, gmlSrs *srs)
Parse gml srsName attribute.
static xmlChar * gmlGetProp(xmlNodePtr xnode, xmlChar *prop)
Retrieve a GML property from a node or NULL otherwise Respect namespaces if presents in the node elem...
static int gml_is_srid_planar(int srid)
Return 1 if given srid is planar (0 otherwise, i.e geocentric srid) Return -1 if srid is not in spati...
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:187
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