I exposed these features in GEOSwift earlier last year, and I do remember finding the behavior a bit confusing. Here are some links to the community request that led me to expose it and the resulting change:
https://github.com/GEOSwift/GEOSwift/issues/196 https://github.com/GEOSwift/GEOSwift/pull/197 On Tue, Jan 5, 2021 at 6:39 PM Martin Davis <mtncl...@gmail.com> wrote: > And for the record, I am -10 on outputting scientific notation, except for > extremely large numbers (say > 10^20 - which should rarely occur in real > data). It just makes the output hard to read. > > On Tue, Jan 5, 2021 at 4:35 PM Martin Davis <mtncl...@gmail.com> wrote: > >> setTrim and setRoundingPrecision are GEOS-specific (not in JTS). >> >> What JTS has is WKTWriter.setPrecisionModel(). What that does is to set >> the max number of decimal places according to the precision supplied (e.g. >> scale = 10 produces 1 decimal, scale = 100 produces 2, etc) >> >> I like the simplicity of having setRoundingPrecision always apply to the >> decimal places. I can't really envision a scenario where there is any >> point in reducing the sig figs (i.e. lopping off digits to the L of the >> decimal place) since they would have to be output as zeroes anyway, so >> there is no savings. >> >> And I would think having trim = true as the default would be most >> friendly, since there doesn't seem to be any value in keeping trailing >> zeroes after the decimal point. >> >> On Tue, Jan 5, 2021 at 3:41 PM Paul Ramsey <pram...@cleverelephant.ca> >> wrote: >> >>> What do people think is the best practice for outputing WKT precision? >> >> >> (Also, what do these knobs (setTrim, setRoundingPrecision) mean in JTS >>> world? I'm guessing our behaviour is *not* an exact analogue. >>> >> >> _______________________________________________ > geos-devel mailing list > geos-devel@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/geos-devel >
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