[postgis-users] Bezier or Spline smoothing implementation

[Mike Toews]

On 19 September 2013 21:58, Stefan Keller <sfkeller at gmail.com> wrote:
> Good you pointed to ST_Line_Interpolate. The use case I have in mind is that
> I have e.g. roads and want to smooth ithem before they are being rendered.
> The input is a linestring and the output is another linestring with about
> same amount of coordinates (or less) - but smoothed.
> Something like this
> http://www.codeproject.com/Articles/31859/Draw-a-Smooth-Curve-through-a-Set-of-2D-Points-wit

A good illustration to contrast the different linear referencing
interpolation techniques is shown here:
http://www.xmswiki.com/xms/File:Redverts.gif where (a) is the original
LineString with 5 vertices, (b) by linear interpolation (i.e.,
ST_Line_Interpolate), and (c) by spline interpolation. Yes, I though
about a spline method too, but I have no solution. The software for
the illustration is closed-source, so there is no further help there.

-Mike