How to enable st_make_valid in sf on Windows (get sf to link to liblwgeom)

[Zedseayou]

Hi all,

Apologies in advance for some probably fairly naive questions. I am working on Windows and trying to get started using st_make_valid. The info here and on this page indicate that st_make_valid needs sf to be installed from source, with liblwgeom present, for a link to happen when I call library(sf).

I have not been able to figure out what is meant by having liblwgeom "present". I installed PostgreSQL 9.6.5 and PostGIS 2.3.3 from the instructions on this link. I had thought that after doing this liblwgeom would be present, but sf still did not detect it.

This info here from March seems to suggest that a dev version of liblwgeom is needed, but not what that entails? Alternatively, what is meant by sf "detecting" liblwgeom? Do I need to point it somewhere in particular? This previous issue was the only thing I could find on getting sf installed with liblwgeom on Windows, but it did not seem to be the same issue. Is there some other major misunderstanding that I have given a lack of experience with PostGIS in the first place?

Any help would be greatly appreciated, including if this question should be directed elsewhere.

Thanks in advance.

EDIT 2 Oct: Saw some more queries here and here on this. Attempting to get st_buffer trick to work in the meantime!

[edzer]

Compiling R packages on windows from source is not trivial if there are external dependencies, and it looks like nobody has so far sorted this out and shared it in such a way that you can carry it out like a recipe. liblwgeom is, like gdal, a "library of libraries", and hence may need some special care, compared to stand-alone libraries like proj or geos.

[tim-salabim]

I haven't had any luck so far. But for most cases the trick w st_buffer(x, 0) seems to work just fine.

[edzer]

Closing here, as we've split off lwgeom to its own R package.

[edzer]

https://twitter.com/edzerpebesma/status/928367268605591555 see appveyor button in README of the lwgeom pkg.