[postgis-devel] st_dwithin, st_within, st_dcompletlywithin

[nicklas.aven at jordogskog.no]

I think ST_DFullyWithin sounds great.
Is it ok if I put this to in ticket #137. In the code they are all close related, st_distance, st_max_distace, st_shortestline, st_longestline, st_dwithin, st_dfullywithin

I have a patch for the trunk that seems to work, but I haven't tested more than randomly. I will try to build cunit-tests but I think it is difficult to get the make check thing work at all. In windows I get som problems and in ubuntu I get permission-problems. I'm new to Linux.

I also just have become a father :-) two weeks ago so my sparetime for learning new things has drastically decreased. 

/Nicklas


2009-07-07 Paragon Corporation  wrote:

Paul and Nicklas,
>
>I think we had suggested calling it ST_DFullyWithin or maybe that was my
>idea.
>
>http://trac.osgeo.org/postgis/ticket/20
>
>Though I guess we closed this out when we put the short circuit in for
>ST_DWithin.  We probably should resurrect or add it as a separate ticket.
>Nicklas since you are working on it, you want to add it as a trac item.
>
>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, 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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>>
>>
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