parse_gml_srs()

static void parse_gml_srs ( xmlNodePtr  xnode, gmlSrs *  srs  )

static

Parse gml srsName attribute.

Definition at line 414 of file lwgeom_in_gml.c.

{
        char *p;
        int is_axis_order_gis_friendly;
        xmlNodePtr node;
        xmlChar *srsname;
        bool honours_authority_axis_order = false;
        char sep = ':';
 
        node = xnode;
        srsname = gmlGetProp(node, (xmlChar *) "srsName");
        /*printf("srsname %s\n",srsname);*/
        if (!srsname)
        {
                if (node->parent == NULL)
                {
                        srs->srid = SRID_UNKNOWN;
                        srs->reverse_axis = false;
                        return;
                }
                parse_gml_srs(node->parent, srs);
        }
        else
        {
                /* Severals     srsName formats are available...
                 *  cf WFS 1.1.0 -> 9.2 (p36)
                 *  cf ISO 19142:2009 -> 7.9.2.4.4 (p34)
                 *  cf RFC 5165 <http://tools.ietf.org/html/rfc5165>
                 *  cf CITE WFS-1.1 (GetFeature-tc17.2)
                 */
 
                /* SRS pattern like:    EPSG:4326
                                        urn:EPSG:geographicCRS:4326
                                        urn:ogc:def:crs:EPSG:4326
                                        urn:ogc:def:crs:EPSG::4326
                                        urn:ogc:def:crs:EPSG:6.6:4326
                                        urn:x-ogc:def:crs:EPSG:6.6:4326
                                        http://www.opengis.net/gml/srs/epsg.xml#4326
                                        http://www.epsg.org/6.11.2/4326
                */
 
                if (!strncmp((char *) srsname, "EPSG:", 5))
                {
                        sep = ':';
                        honours_authority_axis_order = false;
                }
                else if (!strncmp((char *) srsname, "urn:ogc:def:crs:EPSG:", 21)
                         || !strncmp((char *) srsname, "urn:x-ogc:def:crs:EPSG:", 23)
                         || !strncmp((char *) srsname, "urn:EPSG:geographicCRS:", 23))
                {
                        sep = ':';
                        honours_authority_axis_order = true;
                }
                else if (!strncmp((char *) srsname,
                                  "http://www.opengis.net/gml/srs/epsg.xml#", 40))
                {
                        sep = '#';
                        honours_authority_axis_order = false;
                }
                else gml_lwpgerror("unknown spatial reference system", 4);
 
                /* retrieve the last ':' or '#' char */
                for (p = (char *) srsname ; *p ; p++);
                for (--p ; *p != sep ; p--)
                        if (!isdigit(*p)) gml_lwpgerror("unknown spatial reference system", 5);
 
                srs->srid = atoi(++p);
 
                /* Check into spatial_ref_sys that this SRID really exist */
                is_axis_order_gis_friendly = gml_is_srs_axis_order_gis_friendly(srs->srid);
                if (srs->srid == SRID_UNKNOWN || is_axis_order_gis_friendly == -1)
                        gml_lwpgerror("unknown spatial reference system", 6);
 
                /* Reverse axis order if the srsName is meant to honour the axis
                   order defined by the authority and if that axis order is not
                   the GIS friendly one. */
                srs->reverse_axis = !is_axis_order_gis_friendly && honours_authority_axis_order;
 
                xmlFree(srsname);
                return;
        }
}

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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