Re: Comments on Norbert's topological extension of relational algebra

On Friday, December 11, 2015 at 1:20:03 AM UTC-8, Norbert_Paul wrote:
> Norbert_Paul wrote:
> > Tegiri Nenashi wrote:
> >
> >> Here is a paper reinforcing that intuition:
> >> http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.135.2459&rep=rep1&type=pdf
> >>
> >
> > No. This is Egenhofer's "Topological Relations" approach. It is
> > completetly different.
>
> I Took a closer look at the paper. This seems to be one from the RCC8 community:
> Note that the classical
> "Note that PO,TPP,TPP^T, NTPP, NTPP^T, EC, DC, 1' are
> pairwise disjoint, and their sum is 1."
> appears on Page 6.
>
> The abstract of
> http://www.spatial.maine.edu/~max/RaBTR.pdf
> mentions "the eight fundamental topological relations".
>
> It always astonishes me that both communities, RCC8 and Egenhofer, have
> extremely similar concepts but almost never does one group cite papers from
> the other group. The above paper does not even mention Egenhofer.
>
> So this looks like two rivaling research communities
>
> "Topological Relations" vs. RCC8
>
> working on the same topic, and I am sure they know from each other.

Egenhofer's approach seems to be sharper than RCC8. For one thing, there is no muddling the water mereologic stuff. Therefore, let's focus on Egenhofer's approach. Can you please expand on differences of your method with Egenhofer's (aside the database angle)? Received on Fri Dec 11 2015 - 18:39:15 CET