geography_distance_tree()

Datum geography_distance_tree

(

PG_FUNCTION_ARGS

)

Definition at line 331 of file geography_measurement.c.

{
        GSERIALIZED *g1 = NULL;
        GSERIALIZED *g2 = NULL;
        double tolerance = 0.0;
        double distance;
        bool use_spheroid = true;
        SPHEROID s;
 
        /* Get our geometry objects loaded into memory. */
        g1 = PG_GETARG_GSERIALIZED_P(0);
        g2 = PG_GETARG_GSERIALIZED_P(1);
 
        gserialized_error_if_srid_mismatch(g1, g2, __func__);
 
        /* Return zero on empty arguments. */
        if ( gserialized_is_empty(g1) || gserialized_is_empty(g2) )
        {
                PG_FREE_IF_COPY(g1, 0);
                PG_FREE_IF_COPY(g2, 1);
                PG_RETURN_FLOAT8(0.0);
        }
 
        /* Read our tolerance value. */
        if ( PG_NARGS() > 2 && ! PG_ARGISNULL(2) )
                tolerance = PG_GETARG_FLOAT8(2);
 
        /* Read our calculation type. */
        if ( PG_NARGS() > 3 && ! PG_ARGISNULL(3) )
                use_spheroid = PG_GETARG_BOOL(3);
 
        /* Initialize spheroid */
        spheroid_init_from_srid(gserialized_get_srid(g1), &s);
 
        /* Set to sphere if requested */
        if ( ! use_spheroid )
                s.a = s.b = s.radius;
 
        if  ( geography_tree_distance(g1, g2, &s, tolerance, &distance) == LW_FAILURE )
        {
                elog(ERROR, "geography_distance_tree failed!");
                PG_RETURN_NULL();
        }
        /* Knock off any funny business at the nanometer level, ticket #2168 */
        distance = round(distance * INVMINDIST) / INVMINDIST;
 
        PG_RETURN_FLOAT8(distance);
}

References distance(), geography_tree_distance(), gserialized_error_if_srid_mismatch(), gserialized_get_srid(), gserialized_is_empty(), INVMINDIST, LW_FAILURE, and s.

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