Understood, thank you for your help.
I am now faced with a strange problem. I'm obviously wrong somewhere in the
code, but perhaps there is something wrong with the compiler.
I am trying to export a selection of buildings around a place thanks to the
Extrusion Function I sent you some mails ago.
read SHP 'D:/Données/Indicateurs Morphométriques/BD TOPO/buildings.shp' to
buildings;
read SHP 'D:/Données/Indicateurs Morphométriques/BD
TOPO/squares_in_nantes_rgf93.shp' to roi;
zoi = roi filter(roi/gid == 2) select(r | mageometrie =
ST_Extent([ST_Buffer(r/the_geom, 100)]));
intersection = zoi join buildings(z, b | on ST_Intersects(z/mageometrie,
b/the_geom) include b/the_geom, b/Hauteur);
result = intersection select(r | r/Hauteur, truc =
ST_Intersection(r/mageometrie, r/the_geom));
export =[as geometry];
foreach building in result {
add buildingWithFlatRoofExtrusion(building/truc, building/Hauteur) to
export;
}
Unfortunately, this returns :
Exception in thread "main" java.io.IOException: Unable to delete file:
C:\Users\gchauvat\AppData\Local\Temp\ggl-temporal334116472884755770.tmp\ggl-temporal4934100457572999836.gtf
at org.apache.commons.io.FileUtils.forceDelete(FileUtils.java:1643)
at org.apache.commons.io.FileUtils.cleanDirectory(FileUtils.java:1268)
at org.apache.commons.io.FileUtils.deleteDirectory(FileUtils.java:1200)
at org.gearscape.ggl.runtime.IOUtils.clearTemporalFiles(IOUtils.java:95)
at gridGen.places_nantaises.main(places_nantaises.java:393)
I was wondering if it has something to do with a compiler error.
Thank you for looking at this.
I send you an image of a small city generated thanks to some ggl2 functions
(are you interested in the scripts?).
Guillaume
2012/6/22 Fernando González <fergonco@xxxxxxxxx>
> It is indeed right. In the first case, the select is not accessing the
> filter result, it is accessing the original "roi" variable and
> "roi/gid" returns a sequence of all gids. Try this and you'll see:
>
> show roi/gid;
>
> In the second case, the select predicate gives an alias "r" to the
> result of the filter and accesses every element in the resulting
> sequence using that alias. Note that this is the only way to access
> the result of the filter since using "roi" references the original
> variable, as in the first case.
>
> Hope it is clear.
>
> On Fri, Jun 22, 2012 at 10:52 AM, Guillaume Chauvat
> <guillaume.chauvat@xxxxxxxxxxxxxx> wrote:
> > Dear ggl2-users,
> >
> > Lets assume roi is an input datasource containing a numeric field called
> > gid. I'm surprised to notice that:
> >
> > show roi filter(roi/gid == 2) select(roi/gid);
> >
> > show roi filter(roi/gid == 2) select(r | r/gid);
> >
> > do not return the same results:
> >
> > [{gid=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17]}]
> >
> > [{gid=2}]
> >
> > What's wrong?
> >
> > Thanks a lot for your help.
>
>
>
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