[postgis-users] Same, similar et al

[nicklas.aven at jordogskog.no]

Another aproach could be to compare angles in each vertex "corner". If all angles are the same in some sort of tolerance the shape should be the same. 

Jusr a thought

/Nicklas

--

Sendt fra min Nokia N9



09.05.12 18:41 skrev Bob Pawley:

Hi Sandro


Absolutely, if it's something people want.


I developed the first part a few months ago, just as something to do . I 
compare relative distance of points(intersections) of the object, overriding 
the actual distances(size) and ignoring any spatial reference (placement).


The result is an array set of numbers that should match if the two objects 
are the same.


This system can be easily scaled to improve resolution. At the moment I use 
a resolution of 100 points.


I still need to develop a method of analyzing the arrays ( and perhaps, 
giving a percent evaluation of sameness) for which I have some ideas.


I will probably need some help in making it an actual Postgis function if 
that is what you have in mind.


Bob



-----Original Message----- 
From: Sandro Santilli
Sent: Wednesday, May 09, 2012 9:13 AM
To: PostGIS Users Discussion
Subject: Re: [postgis-users] Same, similar et al


On Wed, May 09, 2012 at 09:06:15AM -0700, Bob Pawley wrote:
> Hi Steve
>
> FYI - I'm not involved in the geography side of Postgis, I'm
> developing an application to analyze engineering drawings. So, same
> in shape even if the shapes are spatially diverse is what I was
> looking for.
>
> However, since this function doesn't exist I will need to develop 
> something.


Will you share it ?


--strk;

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