PostGIS  3.1.6dev-r@@SVN_REVISION@@

◆ parse_gml_srs()

static void parse_gml_srs ( xmlNodePtr  xnode,
gmlSrs srs 
)
static

Parse gml srsName attribute.

Definition at line 498 of file lwgeom_in_gml.c.

499 {
500  char *p;
501  int is_axis_order_gis_friendly;
502  xmlNodePtr node;
503  xmlChar *srsname;
504  bool honours_authority_axis_order = false;
505  char sep = ':';
506 
507  node = xnode;
508  srsname = gmlGetProp(node, "srsName");
509  /*printf("srsname %s\n",srsname);*/
510  if (!srsname)
511  {
512  if (node->parent == NULL)
513  {
514  srs->srid = SRID_UNKNOWN;
515  srs->reverse_axis = false;
516  return;
517  }
518  parse_gml_srs(node->parent, srs);
519  }
520  else
521  {
522  /* Severals srsName formats are available...
523  * cf WFS 1.1.0 -> 9.2 (p36)
524  * cf ISO 19142:2009 -> 7.9.2.4.4 (p34)
525  * cf RFC 5165 <http://tools.ietf.org/html/rfc5165>
526  * cf CITE WFS-1.1 (GetFeature-tc17.2)
527  */
528 
529  /* SRS pattern like: EPSG:4326
530  urn:EPSG:geographicCRS:4326
531  urn:ogc:def:crs:EPSG:4326
532  urn:ogc:def:crs:EPSG::4326
533  urn:ogc:def:crs:EPSG:6.6:4326
534  urn:x-ogc:def:crs:EPSG:6.6:4326
535  http://www.opengis.net/gml/srs/epsg.xml#4326
536  http://www.epsg.org/6.11.2/4326
537  */
538 
539  if (!strncmp((char *) srsname, "EPSG:", 5))
540  {
541  sep = ':';
542  honours_authority_axis_order = false;
543  }
544  else if (!strncmp((char *) srsname, "urn:ogc:def:crs:EPSG:", 21)
545  || !strncmp((char *) srsname, "urn:x-ogc:def:crs:EPSG:", 23)
546  || !strncmp((char *) srsname, "urn:EPSG:geographicCRS:", 23))
547  {
548  sep = ':';
549  honours_authority_axis_order = true;
550  }
551  else if (!strncmp((char *) srsname,
552  "http://www.opengis.net/gml/srs/epsg.xml#", 40))
553  {
554  sep = '#';
555  honours_authority_axis_order = false;
556  }
557  else gml_lwpgerror("unknown spatial reference system", 4);
558 
559  /* retrieve the last ':' or '#' char */
560  for (p = (char *) srsname ; *p ; p++);
561  for (--p ; *p != sep ; p--)
562  if (!isdigit(*p)) gml_lwpgerror("unknown spatial reference system", 5);
563 
564  srs->srid = atoi(++p);
565 
566  /* Check into spatial_ref_sys that this SRID really exist */
567  is_axis_order_gis_friendly = gml_is_srs_axis_order_gis_friendly(srs->srid);
568  if (srs->srid == SRID_UNKNOWN || is_axis_order_gis_friendly == -1)
569  gml_lwpgerror("unknown spatial reference system", 6);
570 
571  /* Reverse axis order if the srsName is meant to honour the axis
572  order defined by the authority and if that axis order is not
573  the GIS friendly one. */
574  srs->reverse_axis = !is_axis_order_gis_friendly && honours_authority_axis_order;
575 
576  xmlFree(srsname);
577  return;
578  }
579 }
#define SRID_UNKNOWN
Unknown SRID value.
Definition: liblwgeom.h:229
static int gml_is_srs_axis_order_gis_friendly(int32_t srid)
Return 1 if the SRS definition from the authority has a GIS friendly order, that is easting,...
static xmlChar * gmlGetProp(xmlNodePtr xnode, const char *charProp)
Retrieve a GML property from a node or NULL otherwise Respect namespaces if presents in the node elem...
static void parse_gml_srs(xmlNodePtr xnode, gmlSrs *srs)
Parse gml srsName attribute.
static void gml_lwpgerror(char *msg, __attribute__((__unused__)) int error_code)
Definition: lwgeom_in_gml.c:81

References gml_is_srs_axis_order_gis_friendly(), 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().

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