[geos-devel] OverlayNG as Default

[Daniel Baston]

This strikes me as a big deal - any thoughts on calling the next release
GEOS 4?

Dan

On Tue, Nov 3, 2020 at 5:45 PM Paul Ramsey <pramsey at cleverelephant.ca>
wrote:

> The switch has been flipped.
> If you build GEOS without any options, you will get the OverlayNG engine
> backing the standard geometry functions.
>
> geom->union()
> geom->intersection()
> geom->symdifference()
> geom->difference()
> geom->unaryunion()
>
> The unit and XML tests that differed from the old engine have been updated
> to match the new NG outputs. That means if you use the --disable-overlayng
> option in autotools or the DISABLE_OVERLAYNG option in cmake, not all tests
> will pass anymore. NG is the new normal.
>
> P.
>
> On Fri, Oct 30, 2020 at 1:10 PM Regina Obe <lr at pcorp.us> wrote:
>
>> +1 for flipping the switch.
>>
>>
>>
>> I don’t know what “light your hair on fair”   means J
>>
>>
>>
>>
>>
>> *From:* geos-devel [mailto:geos-devel-bounces at lists.osgeo.org] *On
>> Behalf Of *Paul Ramsey
>> *Sent:* Friday, October 30, 2020 3:47 PM
>> *To:* GEOS Development List <geos-devel at lists.osgeo.org>
>> *Subject:* [geos-devel] OverlayNG as Default
>>
>>
>>
>> OK, it's been a while, and I'd like to flip over GEOS master to use
>> OverlayNG as the engine behind
>>
>>
>>
>> Geometry.intersection()
>>
>> Geometry.difference()
>>
>> Geometry.union()
>>
>> Geometry.symdifference()
>>
>> Geometry.unaryunion()
>>
>>
>>
>> That will entail changing the expected outputs for a few of the
>> regression tests, as detailed here.
>>
>>
>>
>>
>> https://docs.google.com/document/d/1TDm2aR4a7O41-soS-25Xog1EdQcjmvKCnKltxjbxOC0/edit#heading=h.ojs23hjdmk7a
>>
>>
>>
>> Once that is done, regressions in PostGIS and other downstream projects
>> can be #ifdef'ed around GEOS version. As seen in the document above, there
>> actually aren't than many cases that need special handling in PostGIS, and
>> hopefully not in other downstream projects.
>>
>>
>>
>> If you have any concerns, please light your hair on fair in the next
>> couple days.
>>
>>
>>
>> P.
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>
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