PostGIS  2.2.7dev-r@@SVN_REVISION@@
static void parse_gml_srs ( xmlNodePtr  xnode,
gmlSrs srs 
)
static

Parse gml srsName attribute.

Definition at line 349 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().

350 {
351  char *p;
352  int is_planar;
353  xmlNodePtr node;
354  xmlChar *srsname;
355  bool latlon = false;
356  char sep = ':';
357 
358  node = xnode;
359  srsname = gmlGetProp(node, (xmlChar *) "srsName");
360  /*printf("srsname %s\n",srsname);*/
361  if (!srsname)
362  {
363  if (node->parent == NULL)
364  {
365  srs->srid = SRID_UNKNOWN;
366  srs->reverse_axis = false;
367  return;
368  }
369  parse_gml_srs(node->parent, srs);
370  }
371  else
372  {
373  /* Severals srsName formats are available...
374  * cf WFS 1.1.0 -> 9.2 (p36)
375  * cf ISO 19142:2009 -> 7.9.2.4.4 (p34)
376  * cf RFC 5165 <http://tools.ietf.org/html/rfc5165>
377  * cf CITE WFS-1.1 (GetFeature-tc17.2)
378  */
379 
380  /* SRS pattern like: EPSG:4326
381  urn:EPSG:geographicCRS:4326
382  urn:ogc:def:crs:EPSG:4326
383  urn:ogc:def:crs:EPSG::4326
384  urn:ogc:def:crs:EPSG:6.6:4326
385  urn:x-ogc:def:crs:EPSG:6.6:4326
386  http://www.opengis.net/gml/srs/epsg.xml#4326
387  http://www.epsg.org/6.11.2/4326
388  */
389 
390  if (!strncmp((char *) srsname, "EPSG:", 5))
391  {
392  sep = ':';
393  latlon = false;
394  }
395  else if (!strncmp((char *) srsname, "urn:ogc:def:crs:EPSG:", 21)
396  || !strncmp((char *) srsname, "urn:x-ogc:def:crs:EPSG:", 23)
397  || !strncmp((char *) srsname, "urn:EPSG:geographicCRS:", 23))
398  {
399  sep = ':';
400  latlon = true;
401  }
402  else if (!strncmp((char *) srsname,
403  "http://www.opengis.net/gml/srs/epsg.xml#", 40))
404  {
405  sep = '#';
406  latlon = false;
407  }
408  else gml_lwpgerror("unknown spatial reference system", 4);
409 
410  /* retrieve the last ':' or '#' char */
411  for (p = (char *) srsname ; *p ; p++);
412  for (--p ; *p != sep ; p--)
413  if (!isdigit(*p)) gml_lwpgerror("unknown spatial reference system", 5);
414 
415  srs->srid = atoi(++p);
416 
417  /* Check into spatial_ref_sys that this SRID really exist */
418  is_planar = gml_is_srid_planar(srs->srid);
419  if (srs->srid == SRID_UNKNOWN || is_planar == -1)
420  gml_lwpgerror("unknown spatial reference system", 6);
421 
422  /* About lat/lon issue, Cf: http://tinyurl.com/yjpr55z */
423  srs->reverse_axis = !is_planar && latlon;
424 
425  xmlFree(srsname);
426  return;
427  }
428 }
static void gml_lwpgerror(char *msg, int error_code)
Definition: lwgeom_in_gml.c:67
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:172

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