[R-sig-Geo] Compile sf in windows with liblwgeom

[Edzer Pebesma]

On 17/09/17 00:07, Edzer Pebesma wrote:
> 
> 
> 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>>
>> wrote:
>>
>>
>>
>>     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:
>>
>> https://gis.stackexchange.com/questions/254836/sf-lines-to-polygons-with-holes
> 
> 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
> same direction.
> 
>>
>> 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.

liblwgeom is part of the postgis source tree in
https://github.com/postgis/postgis , but when configuring that with

./autogen.sh
./configure --without-pgconfig

liblwgeom becomes the sole build target.

The few dependencies it has (geos, proj, json-c) are, AFAICT, all
already in rwinlib/gdal2

> 
>>
>> Barry
>>
> 
> 
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics  (ifgi),  University of Münster
Heisenbergstraße 2, 48149 Münster, Germany; +49 251 83 33081
Journal of Statistical Software:   http://www.jstatsoft.org/
Computers & Geosciences:   http://elsevier.com/locate/cageo/

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