[geos-devel] CAPI GEOSUnionCascaded

Martin Davis mtnclimb at gmail.com
Thu Jul 15 11:24:55 PDT 2021

+1 for flipping to OverylayNG

On Thu, Jul 15, 2021 at 11:01 AM Paul Ramsey <pramsey at cleverelephant.ca>

> Just stumbled over this old stub,
> https://github.com/libgeos/geos/blob/main/capi/geos_ts_c.cpp#L1425
> In addition to GEOSUnaryUnion, which calls a cascaded union as required,
> we have this explicit hook into cascaded polygon union in the C API. It
> seems a little duplicative, which is not a high crime, but it also has a
> hidden feature: unlike UnaryUnion which calls the new NG routines in "safe
> sequence" (try full precision, fall back to gentle snapping, fall back to
> snap rounding), this CAPI GEOSUnionCascaded call uses the
> ClassicUnionStrategy, which is to say the *old* overlay functions and the
> HeuristicOverlay fallbacks (various forms of bit stripping and precision
> reduction).
> Question:
> - just remove this API end point entirely?
> - flip it over to also use NG semantics?
> - don't touch that you fool, it's important to have it as it is!
> thanks,
> P
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