Right. JTS assumes the coordinate system is Euclidean, so computing
intersections in a geodetic coordinate system (in which segments are great
circle arcs) is not going to produce a correct result.
On Tue, Jul 29, 2014 at 11:02 AM, Sebastian Kürten <
[email protected]> wrote:
> Okay, my fault, I should have tested using the JTS TestBuilder myself.
>
> Turns out it's just a problem with projections and I guess not
> strictly speaking JTS-related. I'm doing my spatial operations on some
> data which is in WGS84 and I thinkg doing linear interpolation between
> individual coordinates is just not possible. I did not realize this was
> a problem when working with small polygons, but with country-boundaries
> this becomes an issue. I guess it would work with Mercator projection.
>
> Thank you!
>
> On Tue, 29 Jul 2014 09:26:30 -0700
> Martin Davis <[email protected]> wrote:
>
> > When I run this computation in the JTS TestBuilder, I get exactly the
> > output in c.wkt, and it looks fine to me (see attached image).
> >
> > Perhaps your viewer code is not displaying it correctly for some
> > reason?
> >
> > [image: Inline image 1]
> >
> >
> > On Mon, Jul 28, 2014 at 5:39 AM, Sebastian Kürten <
> > [email protected]> wrote:
> >
> > > Hi,
> > >
> > > I'm performing some intersection operations with polygons and
> > > although I'm aware of the inherent limitations concerning the
> > > precision of the results due to limited precision floating point
> > > arithmetic, I find some of the results a little weird. Some results
> > > I get appear to be quite far off, is this within the range of
> > > expected error? See the attached files: c.wkt is the intersection
> > > of a.wkt and b.wkt. The image shows all three of them.
> > >
> > >
>
>
> ------------------------------------------------------------------------------
> Infragistics Professional
> Build stunning WinForms apps today!
> Reboot your WinForms applications with our WinForms controls.
> Build a bridge from your legacy apps to the future.
>
> http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk
> _______________________________________________
> Jts-topo-suite-user mailing list
> [email protected]
> https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user
>
------------------------------------------------------------------------------
Infragistics Professional
Build stunning WinForms apps today!
Reboot your WinForms applications with our WinForms controls.
Build a bridge from your legacy apps to the future.
http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk
_______________________________________________
Jts-topo-suite-user mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/jts-topo-suite-user
