[geos-devel] OverlayNG as Default

[Paul Ramsey]

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
>
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>
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> *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
>
>
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> Geometry.intersection()
>
> Geometry.difference()
>
> Geometry.union()
>
> Geometry.symdifference()
>
> Geometry.unaryunion()
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> That will entail changing the expected outputs for a few of the regression
> tests, as detailed here.
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>
> https://docs.google.com/document/d/1TDm2aR4a7O41-soS-25Xog1EdQcjmvKCnKltxjbxOC0/edit#heading=h.ojs23hjdmk7a
>
>
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> 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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