[postgis-devel] st_dwithin, st_within, st_dcompletlywithin

[Paragon Corporation]

Not to pull a "but Oracle does it that way"

Their SDO_WITHIN_DISTANCE also uses the minimum distance like PostGIS
ST_Dwithin

http://download.oracle.com/docs/html/A85337_01/sdo_oper.htm#77655 

Do they have a fully dwithin counter part?

Thanks,
Regina

-----Original Message-----
From: postgis-devel-bounces at postgis.refractions.net
[mailto:postgis-devel-bounces at postgis.refractions.net] On Behalf Of Paul
Ramsey
Sent: Monday, July 06, 2009 7:23 PM
To: PostGIS Development Discussion
Subject: Re: [postgis-devel] st_dwithin, st_within, st_dcompletlywithin

It gets even more confusing if you note that some members of the WFS working
group insist that the semantics of the WithinDistance OGC filter op are the
semantics of your proposed function, rather than the semantics of dwithin.

P

On Mon, Jul 6, 2009 at 4:19 PM, <nicklas.aven at jordogskog.no> wrote:
> Hallo
>
> This is a semantic question.
> I'm working with the new functions st_shortestline etc.
> I found that we can get another new function for free when we have 
> implemented st_max_distance. By using the max-calculation instead of 
> min-calculation the same way as st_dwithin, we insead get 
> "st_dcompletlywithin" the function returns true if the maximum 
> distance between the geometries is shorter than the third input.
>
> My question is (beside the question if this is something useble), what 
> to call the function. I think it easily can be confusing. I mean, 
> st_within and st_dwithin is two quite similar names wich is ok because 
> they don't really relate to eachother in what they do, but if we add a 
> function that do the same as st_dwithin but whith the difference that 
> the geometries has to be completly inside the given distance of 
> eachother, maybe we risk making it confusing. I guess 
> st_dcompletlywithin is maybe the most describing, but very long.
>
> Greetings
> Nicklas
>
>
>
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