PostGIS  2.3.8dev-r@@SVN_REVISION@@

◆ parse_gml_srs()

static void parse_gml_srs ( xmlNodePtr  xnode,
gmlSrs srs 
)
static

Parse gml srsName attribute.

Definition at line 363 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().

364 {
365  char *p;
366  int is_planar;
367  xmlNodePtr node;
368  xmlChar *srsname;
369  bool latlon = false;
370  char sep = ':';
371 
372  node = xnode;
373  srsname = gmlGetProp(node, (xmlChar *) "srsName");
374  /*printf("srsname %s\n",srsname);*/
375  if (!srsname)
376  {
377  if (node->parent == NULL)
378  {
379  srs->srid = SRID_UNKNOWN;
380  srs->reverse_axis = false;
381  return;
382  }
383  parse_gml_srs(node->parent, srs);
384  }
385  else
386  {
387  /* Severals srsName formats are available...
388  * cf WFS 1.1.0 -> 9.2 (p36)
389  * cf ISO 19142:2009 -> 7.9.2.4.4 (p34)
390  * cf RFC 5165 <http://tools.ietf.org/html/rfc5165>
391  * cf CITE WFS-1.1 (GetFeature-tc17.2)
392  */
393 
394  /* SRS pattern like: EPSG:4326
395  urn:EPSG:geographicCRS:4326
396  urn:ogc:def:crs:EPSG:4326
397  urn:ogc:def:crs:EPSG::4326
398  urn:ogc:def:crs:EPSG:6.6:4326
399  urn:x-ogc:def:crs:EPSG:6.6:4326
400  http://www.opengis.net/gml/srs/epsg.xml#4326
401  http://www.epsg.org/6.11.2/4326
402  */
403 
404  if (!strncmp((char *) srsname, "EPSG:", 5))
405  {
406  sep = ':';
407  latlon = false;
408  }
409  else if (!strncmp((char *) srsname, "urn:ogc:def:crs:EPSG:", 21)
410  || !strncmp((char *) srsname, "urn:x-ogc:def:crs:EPSG:", 23)
411  || !strncmp((char *) srsname, "urn:EPSG:geographicCRS:", 23))
412  {
413  sep = ':';
414  latlon = true;
415  }
416  else if (!strncmp((char *) srsname,
417  "http://www.opengis.net/gml/srs/epsg.xml#", 40))
418  {
419  sep = '#';
420  latlon = false;
421  }
422  else gml_lwpgerror("unknown spatial reference system", 4);
423 
424  /* retrieve the last ':' or '#' char */
425  for (p = (char *) srsname ; *p ; p++);
426  for (--p ; *p != sep ; p--)
427  if (!isdigit(*p)) gml_lwpgerror("unknown spatial reference system", 5);
428 
429  srs->srid = atoi(++p);
430 
431  /* Check into spatial_ref_sys that this SRID really exist */
432  is_planar = gml_is_srid_planar(srs->srid);
433  if (srs->srid == SRID_UNKNOWN || is_planar == -1)
434  gml_lwpgerror("unknown spatial reference system", 6);
435 
436  /* About lat/lon issue, Cf: http://tinyurl.com/yjpr55z */
437  srs->reverse_axis = !is_planar && latlon;
438 
439  xmlFree(srsname);
440  return;
441  }
442 }
static void gml_lwpgerror(char *msg, int error_code)
Definition: lwgeom_in_gml.c:81
static void parse_gml_srs(xmlNodePtr xnode, gmlSrs *srs)
Parse gml srsName attribute.
static xmlChar * gmlGetProp(xmlNodePtr xnode, xmlChar *prop)
Retrieve a GML propertie from a node or NULL otherwise Respect namespaces if presents in the node ele...
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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