[postgis-users] DE-9IM pattern for gaps

[Shaozhong SHI]

How about the following situations?

Scenario 1
2 lines zigzagging over the space.  Some time, a line crosses over another
and then crosses again to return.  Can DE-9IM tell with a pattern?

Scenario 2.
2 lines zigzagging over the space.  Some time, they meet and touch each
other, but never cross each other.  There may be gaps between them.
Will there be any DE-9IM for this situation?

Regards,

David

On Wed, 6 Jul 2022 at 17:00, Martin Davis <mtnclimb at gmail.com> wrote:

> You haven't specified what you mean by "gap".  The DE-9IM model is a
> "global" model, in that it considers the input geometries as a whole.  You
> can use the DE-9IM to determine if two geometries have a "gap" between them
> via ST_Disjoint.
>
> On Wed, Jul 6, 2022 at 8:48 AM Shaozhong SHI <shishaozhong at gmail.com>
> wrote:
>
>> Is there a DE-9IM pattern for gaps?
>> Regards,
>> David
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