[postgis-users] Where a full list of DE-9IM pattern can be found for ST_Relate?

[Phil Bartie]

Hi David,

There are a large number (6561) of theoretical possible relationships
between 2 features which can be expressed by DE-9IM. Not sure what you mean
by 'type of errors', but from what I understand the DE-9IM is a
mathematically complete set of all options for how 2 features can interact.

As well as the wiki page Martin mentioned there's also some examples here:
https://docs.tatukgis.com/DK11/doc:de9im
These slides are quite useful too for some more background -
https://event.cwi.nl/eswc2015-geo/02-background.pdf -  check slides 14 to
20.

A key paper from Clementini et al on the theory behind all this is:
http://delab.csd.auth.gr/~alex/sdb/artSSD93.pdf

best
Phil

On Tue, 29 Mar 2022 at 22:43, Shaozhong SHI <shishaozhong at gmail.com> wrote:

> I saw that one, but could not find a table of DE-9IM, type of
> intersection, type of errors.
>
> Some may not be errors.
>
> It will nice to get hold of a confirmed table.
>
> Regards,
>
> David
>
> On Tue, 29 Mar 2022 at 22:03, Martin Davis <mtnclimb at gmail.com> wrote:
>
>> The first thing that shows up on a web search is a good resource:
>>
>> https://en.wikipedia.org/wiki/DE-9IM
>>
>> On Tue, Mar 29, 2022 at 1:27 PM Shaozhong SHI <shishaozhong at gmail.com>
>> wrote:
>>
>>> Where a full list of DE-9IM pattern can be found for ST_Relate?
>>>
>>> Regards,
>>>
>>> David
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