[postgis-users] Evenly distributing a point set

Rémi Cura remi.cura at gmail.com
Mon Jan 26 01:56:03 PST 2015

it is unclear what you want and how your data looks like.
For better answer it would be good to have better info.

Maybe a screen of your data, some facts, for what usage (admissible error,
expected quality ..) etc etc.

What you are trying to do (reconstruct a network from sampled pieces) is in
general a complicated problem.
It may be simpler depending on your data and hypothesis.


2015-01-26 9:28 GMT+01:00 Dave Barter <dave at phased.co.uk>:

> > These points were created from a GPX file along a road journey so they
> crudely map to a line string
> "Map matching" is the term often used to describe the process of assigning
> noisy Gpx points to underlying road network.
> My problem is a bit more involved.
> The GPX points represent the national cycle network in the UK. These
> points cover roads/tracks/paths and all sorts and as such I cannot really
> snap to map. Creating line strings from the points will possibly cause
> errors as well as I think there will be a lot of cases where the wrong
> points are joined.
> I think the safest method is to remove densely distributed points from the
> current set until they all have a KNN value of > X. This will not create a
> completely even distribution but will ensure that no points are created in
> the wrong place which may be the case with line interpolation.
> Can anyone help me with a query to do this?
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