[pgrouting-users] Direction for path

[poonam jalwan]

Hi,

Can u explain me how u implement  direction of shortest path in 
application.What is minimum requirement of data.

like my data structure is  :-

CREATE TABLE india_roads
(
  gid serial NOT NULL,
  med_descri character varying(254),
  rtt_descri character varying(254),
  f_code_des character varying(10),
  iso character varying(7),
  isocountry character varying(54),
  the_geom geometry,
  source integer,
  target integer,
  length double precision,
  "cost" double precision,
  id integer NOT NULL DEFAULT nextval('india_roads_gid_seq'::regclass),
  CONSTRAINT india_roads_pkey PRIMARY KEY (gid),
  CONSTRAINT enforce_dims_the_geom CHECK (ndims(the_geom) = 2),
  CONSTRAINT enforce_geotype_the_geom CHECK (geometrytype(the_geom) = 
'MULTILINESTRING'::text OR    the_geom IS NULL),
  CONSTRAINT enforce_srid_the_geom CHECK (srid(the_geom) = 4326)
)
WITH (OIDS=FALSE);
ALTER TABLE india_roads OWNER TO postgres;
GRANT ALL ON TABLE india_roads TO postgres;
GRANT SELECT ON TABLE india_roads TO public;

Finding direction of shortest path is possible on my dataset..



Thanks
Poonam

Stephen Woodbridge wrote:
> poonam jalwan wrote:
>> Hi All,
>>
>> I am using pgrouting functions for finding  shortest path from point 
>> A to point B,Now i want to find the direction of shortest path and 
>> multiple path from point A to point B.Please anyone help which 
>> function of pgrouting i have to use.
>
> When you say "direction of shortest path" are you referring to human 
> readable text driving directions?
>
> If so there currently is no function in pgRouting that does that. I 
> have discussed this in some detail on the list (check the archives), 
> and how it can be implemented. I have implemented this:
> http://imaptools.com:8080/maps/dd2.html?lat=34.53886&lon=69.15786&zoom=13&layers=B00TFTTTF&start=69.144741%2034.547085&stop=69.172264%2034.531735&method=STS&lang=eng 
>
> but is dependent on the structure of the data tables you load and use. 
> There is a lot more information in the archives explain how this was 
> done.
>
> -Steve
>