[postgis-users] Same, similar et al

[Nicolas Ribot]

Hi,

Doen't the st_hausdorffDistance function compare shapes of geometries ?

Nicolas

On 9 May 2012 19:36,  <nicklas.aven at jordogskog.no> wrote:
> 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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