[pgrouting-users] Driving distance/pgr_alphaShape/pgr_pointsAsPolygon

dave.potts at pinan.co.uk dave.potts at pinan.co.uk
Tue Nov 11 00:30:14 PST 2014

Hi list,

I am trying to work out why I would want to use pgr_alphaShape and
Pgr_pointsAsPolygon with the results of a pgr_dirvingDistance.

All 3 functions are enabled when 'Driving Distance' is enabled so logical
I assume that they are deisgned to be used together.

I can take the results of a driving distance, which gives me a list of
points, look up this list in by node table, which gives me a list of x/y
values, I can then create a polygon from this list which will give me what
I am after

What will pgr_pointsAsPolygon/pgr_alphashape enabled me to do  in this


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