[postgis-users] Dumping out points in a linestring

[Mr. Puneet Kishor]

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