Geometry Boost List: Re: [geometry] [Spatial Index] bug & question

Subject: Re: [geometry] [Spatial Index] bug & question
From: Barend Gehrels (barend_at_[hidden])
Date: 2013-06-19 12:56:46

Hi,

On 19-6-2013 16:48, Adam Wulkiewicz wrote:
> Hi,
>
> TONGARI wrote:
>>
>> But I don't think this could be implemented in a really generic way for
>> Spatial Index, so I think a 'contains' (and 'covers'?) addition would
>> just be fine.
>>
>
> I like this solution, it's simple and meaningful. But this only makes 
> sense if those names aren't used in Boost.Geometry for something 
> different than boolean operation. So, I guess we must wait for Barend 
> with this.

Contains is perfect. It is reserved for exactly this function. It is 
(about) the reverse of within. Also covers is fine, which is (about) the 
reverse of covered_by. We plan to support them in Boost.Geometry too.

See also:
http://postgis.net/docs/manual-2.0/ST_Contains.html
http://postgis.net/docs/manual-2.0/ST_Covers.html

And a blog of "Dr JTS" explaining subtleties between the definitions
http://lin-ear-th-inking.blogspot.nl/2007/06/subtleties-of-ogc-covers-spatial.html

Regards, Barend