[R-sig-Geo] Compile sf in windows with liblwgeom
edzer.pebesma at uni-muenster.de
Sun Sep 17 00:07:35 CEST 2017
On 16/09/17 18:22, Barry Rowlingson wrote:
> On Sat, Sep 16, 2017 at 3:45 PM, Edzer Pebesma
> <edzer.pebesma at uni-muenster.de <mailto:edzer.pebesma at uni-muenster.de>>
> On 16/09/17 15:20, Eduardo Diez wrote:
> > Dear list,
> > I have a MULTIPOLYGON geometry set where the rings are in the wrong
> > direction and would like to correct that with *st_make_valid*. As I'm in
> > Windows and use the binary version of the *sf* package it gives me the
> > error:
> >> sp2 = st_make_valid(sp1)
> > Error in CPL_make_valid(x) :
> > st_make_valid requires compilation against liblwgeom
> > Is there a series of steps I can follow for compiling *sf* in Windows
> > linked to liblwgeom?
> No, and I also don't think that st_make_valid does this.
> st_make_valid certainly did something:
I only tried a single outer ring in both directions, and it didn't
revert them. Maybe it only reverts if if outer and inner ring have the
> I've just added an edit to my answer there with the sp-and-back round
> trip, which seems to work, but its not exactly the most satisfying solution.
It would be fairly trivial to move some of the code to sf - at a
performance penalty if we'd do the check always, like sp does.
> What's the problem with liblwgeom on Windows?
It's not part of the rwinlib collection at https://github.com/rwinlib ;
I'll bring it up with Jeroen next time I see him. lwgeom has more good
things than what sf uses.
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