[geos-devel] Correct use of setPrecision

[Martin Davis]

That is correct - the precision model is not used in relate and spatial
predicate evaluation.  (It's used in a few more places than the overlay
functions, but that is its primary usage)

It is feasible to introduce a precision model into the spatial predicate
computation, but not easily in the current implementation.  I have plans
for a better implementation which will make it straightforward to use the
precision model.  No timeline on that, however.

On Wed, Sep 6, 2017 at 6:03 AM, Daniel Baston <dbaston at gmail.com> wrote:

> My understanding is that precision models are considered only in the
> overlay options (and not in the geometry predicates).
>
> Dan
>
> On Mon, Sep 4, 2017 at 5:13 AM, Nyall Dawson <nyall.dawson at gmail.com>
> wrote:
>
>> On 4 September 2017 at 17:29, Sandro Santilli <strk at kbt.io> wrote:
>> > On Mon, Sep 04, 2017 at 04:28:32PM +1000, Nyall Dawson wrote:
>> >
>> >> However, after looking into this in more depth I think the original
>> >> python code is incorrectly used. It's being used by QGIS in order to
>> >> set a "tolerance" on a spatial join operation - i.e. to consider that
>> >> two geometries which are 100m distant actually do intersect.
>> >
>> > [...]
>> >
>> >> If this is correct, is there any other way in GEOS to handle this
>> situation?
>> >
>> > How about using GEOSDistance ?
>>
>> Thanks - that's a good option for intersects tests. I'm not sure
>> offhand if it would be translatable to the other geometry predicates,
>> but then I'd say trying to do a 'touches' or 'contains' test with a
>> tolerance would be quite an edge case anyway.
>>
>> Nyall
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>
>
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