[postgis-users] Dumping out points in a linestring

[Puneet Kishor]

On Jul 10, 2012, at 12:24 AM, Ed Linde <edolinde at gmail.com> wrote:

> Thanks, is there a way to then dump out inflection points in postgis?



Don't know off the top of my head. Perhaps there is a way to simplify the line so all points that don't change the slope are removed. Then you can dump the resulting line.


> 
> On Mon, Jul 9, 2012 at 3:13 PM, Mr. Puneet Kishor <punk.kish at gmail.com> wrote:
> 
> On Jul 9, 2012, at 6:37 PM, Ed Linde wrote:
> 
> > Thanks Nicolas. I was wondering what these points in the linestring
> > symbolize? Are the default set of points on a 2D linestring
> > indicating the positions at which the line is not straight and changes
> > directions?
> 
> 
> Points making up a linestring are just that, points. They have no relationship to whether or not the line changes direction. Consider...
> 
> 
>     +---------+-------------+---------------+
> 
> '+' are points defining the linestring that is symbolized by '+' and '-', but there is no change in direction, no inflection point.
> 
> 
> --
> Puneet Kishor
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