[postgis-users] working with PLSS: state-plane survey system coordinates

[Bill Thoen]

On Thu, Sep 28, 2006 at 06:32:03PM -0700, Dylan Beaudette wrote:
> However, I haven't quite come up with a good approach to throwing out 
> triangle-like sections: other than a simple check for 4 'corners' : NE NW SE 
> SW ... although this seems to work most of the time, a more robust approach 
> might be better.

The way I do this is to start with the minimum bounding rectangle of the
section, and then I loacate the point on the section boundary closest to
each corner of the MBR. If I get four different points, then all is fine;
otherwise, the section is degneræte.

- Bill Thoen