Thanks Sven,
I will test the performance... some my objects have around
10000 points.
Maybe I will reduce the amount of point and sacrifice some precision.
I thought something like that was already available in SH.
Best regards
On Sat, Jul 25, 2015 at 4:31 AM, Sven Van Caekenberghe <s...@stfx.eu> wrote:
> Arturo,
>
> In Pharo itself, you could just do it yourself, like this:
>
> T3GeoTools class>>#is: position inside: polygon
> "T3GeoTools is: 5.33732@50.92601 inside: { 5.48230@50.82249.
> 5.49523@50.81288. 5.50138@50.82008. 5.50228@50.82595. 5.49265@50.82560.
> 5.48230@50.82249 }"
>
> "T3GeoTools is: 5.49007@50.82205 inside: { 5.48230@50.82249.
> 5.49523@50.81288. 5.50138@50.82008. 5.50228@50.82595. 5.49265@50.82560.
> 5.48230@50.82249 }"
>
> "Point in polygon - ray casting algorithm -
> http://www.ecse.rpi.edu/Homepages/wrf/Research/Short_Notes/pnpoly.html";
>
> | inside otherIndex |
> inside := false.
> otherIndex := polygon size.
> polygon doWithIndex: [ :each :index | | other |
> other := polygon at: otherIndex.
> (((each y > position y) ~= (other y > position y))
> and: [ position x < (((other x - each x) *
> (position y - each y) / (other y - each y)) + each x) ])
> ifTrue: [ inside := inside not ].
> otherIndex := index ].
> ^ inside
>
> Inside circle, rectangle etc are trivial.
>
> Sven
>
> > On 25 Jul 2015, at 01:19, Arturo Zambrano <arturo.zambr...@gmail.com>
> wrote:
> >
> > Hi All,
> > I would like to get some advice regarding which path I should take.
> >
> > Problem:
> > Given a coordinate I want to know to which geographical object it
> belongs to.
> >
> > Path 1
> > Using Glorp to make a query to a Postgis instance containing the
> boundaries of the geobjects
> >
> >
> >
> > Path 2
> > Use the data form GADM data (according to this thread).
> >
> >
> > I would avoid path 1 in order to avoid installation of postgi. From the
> > thread mentioned above, I thing that it requires some development.
> >
> >
> > Regarding Path 2, I don't see which framework or library should I use to
> > import and query the data contained in the KMZ from GADM.
> >
> >
> > Any advice is welcome.
> >
> > Best regards.
> > Art
> >
> >
>
>
>
