[pgrouting-dev] postgis2 and driving distance

[Daniel Kastl]

Hi Mario,

I think it's a good idea to drop CGAL if possible ... and you proofed that
it is possible.
I guess that PostGIS 2.0 will soon become a standard, so if we now want to
make a bigger cleanup and new release of pgRouting it's OK to require
PostGIS 2.0 in my opinion. There haven't been many questions about driving
distance on the lists, so I assume there are not so many users of this
function either.

If you move it into "core" (which is a good idea), please don't commit it
into "master" branch for now.
I would propose to either make a different branch for that, that we can
merge later, or use "devel-2_0" branch, which already contains code
cleanup: https://github.com/pgrouting/pgrouting/tree/devel-2_0

Daniel



On Tue, Jun 19, 2012 at 11:11 AM, Mario Basa <mario.basa at gmail.com> wrote:

> Hi,
>
> It really is possible now to take away CGAL from pgRouting since
> st_concavehull of PostGIS 2 can create the same alpha shape. I have already
> managed to compile diriving-dist without CGAL installed by modifying the
> cmake files and drivedist.c.
>
> I used this:
>
> select st_concavehull(st_collect(
>   st_geomfromewkt('srid=4326;POINT('||x1||' '||y1||')')),0.7) from
> jp_2po_4pgr,
>   driving_distance('SELECT id,source,target,cost,reverse_cost from
> jp_2po_4pgr
>   where st_contains(ST_GeomFromEWKT(''SRID=4326;POLYGON((139 35,139 36,140
> 36,140 35,139 35))''),
>   the_geom) = true',156598,0.07,false,false) where id = edge_id;
>
> to create the drive time polygon in the attached screen dump. The
> performance isn't so bad even with a 0.7 target percent parameter for the
> concave hull.
>
> I am planning to clean up routing_dd.sql and routing_dd_wrapper.sql and
> start using the newer st_* postgis functions.
>
> Will there be any objections if I move routing_dd into core instead of
> extra since it will now only use BOOST to compile.
>
> Mario.
>
>
>
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>
>


-- 
Georepublic UG & Georepublic Japan
eMail: daniel.kastl at georepublic.de
Web: http://georepublic.de
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