Hi,
Is method of applying constraints (setting tolerance) similar in
ConformingDelaunayTriangulator Class to DelaunayTriangulationBuilder class?
Brian.
On Tue, Dec 3, 2013 at 12:57 PM, Brian Sanjeewa Rupasinghe <
[email protected]> wrote:
>
> Hi,
>
> Yes, changing the tolerance affects the topology seriously. I tested this
> class with different data sets. What is weird is for some data sets, it
> works for a very small tolerance and for some not. Any alternative for this?
>
> Cheers, Brian.
>
> On Tue, Dec 3, 2013 at 12:21 AM, <
> [email protected]> wrote:
>
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>> Today's Topics:
>>
>> 1. Polygon difference (Brian Sanjeewa Rupasinghe)
>> 2. Re: Polygon difference (Martin Davis)
>> 3. extract inserted envelopes from strtree (andrea antonello)
>> 4. Fwd: Polygon offset (Martin Davis)
>> 5. DelaunayTriangulationBuilder snapping tolerance
>> (Brian Sanjeewa Rupasinghe)
>> 6. Point to polygon distance in specified directions
>> (Michael Bedward)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Sat, 30 Nov 2013 13:41:50 +0000
>> From: Brian Sanjeewa Rupasinghe <[email protected]>
>> Subject: [Jts-topo-suite-user] Polygon difference
>> To: [email protected]
>> Message-ID:
>> <
>> caema-4gameevhzub-vmtdbnxiaqhrpzqb5quf08tdq9gt1u...@mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> I have a small rectangles inside a bigger one with one side almost
>> touching
>> that of bigger rectangle. I need to get the difference which should be
>> another rectangle wiith JTS difference() method. Once obtained the
>> difference, output is not exactly a rectangle because
>> vertices of the touching edge of smaller rectangle do not exist on the
>> larger rectangle. Is there any possibility to clean the geometries so that
>> the two touching lines will collapse and
>> create new segments along that line with correct noding. I tried using
>> GeometrySnapper class with computeOverlaySnapTolerance() method. But it
>> did not work. Is there any other method to deal with this in JTS?
>>
>> Cheers, Brian
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Sun, 1 Dec 2013 07:11:04 -0800
>> From: Martin Davis <[email protected]>
>> Subject: Re: [Jts-topo-suite-user] Polygon difference
>> Cc: "[email protected]"
>> <[email protected]>
>> Message-ID:
>> <
>> cak2ens1vj8knq2txwbg+-no-0exrvzurbbeotrr0bqedez2...@mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Would be helpful to see the WKT for this case and perhaps the expected
>> output.
>>
>>
>> On Sat, Nov 30, 2013 at 5:41 AM, Brian Sanjeewa Rupasinghe <
>> [email protected]> wrote:
>>
>> > I have a small rectangles inside a bigger one with one side almost
>> > touching that of bigger rectangle. I need to get the difference which
>> > should be another rectangle wiith JTS difference() method. Once obtained
>> > the difference, output is not exactly a rectangle because
>> > vertices of the touching edge of smaller rectangle do not exist on the
>> > larger rectangle. Is there any possibility to clean the geometries so
>> that
>> > the two touching lines will collapse and
>> > create new segments along that line with correct noding. I tried using
>> > GeometrySnapper class with computeOverlaySnapTolerance() method. But it
>> > did not work. Is there any other method to deal with this in JTS?
>> >
>> > Cheers, Brian
>> >
>> >
>> >
>> >
>> ------------------------------------------------------------------------------
>> > Rapidly troubleshoot problems before they affect your business. Most IT
>> > organizations don't have a clear picture of how application performance
>> > affects their revenue. With AppDynamics, you get 100% visibility into
>> your
>> > Java,.NET, & PHP application. Start your 15-day FREE TRIAL of
>> AppDynamics
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>> http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clktrk
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>> >
>> >
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>>
>> ------------------------------
>>
>> Message: 3
>> Date: Mon, 2 Dec 2013 14:59:12 +0100
>> From: andrea antonello <[email protected]>
>> Subject: [Jts-topo-suite-user] extract inserted envelopes from strtree
>> To: "[email protected]"
>> <[email protected]>
>> Message-ID:
>> <
>> cacck5jpeq5najqu97b09vlpxjg8toaa2pn+wcrgpepo95tg...@mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hello,
>> I am trying to understand if there is a way to get the list of envelopes
>> that were used to insert items in a STRtree, but while I see a way to get
>> the itemstree I can't find one to get the itemBoundables list.
>>
>> Any idea?
>>
>> Thanks,
>> Andrea
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>>
>> ------------------------------
>>
>> Message: 4
>> Date: Mon, 2 Dec 2013 11:29:01 -0800
>> From: Martin Davis <[email protected]>
>> Subject: [Jts-topo-suite-user] Fwd: Polygon offset
>> To: "[email protected]"
>> <[email protected]>
>> Message-ID:
>> <CAK2ens0maXAt2huOznTNKvZkdqGu81cR=
>> [email protected]>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Brian, please send these questions to the JTS list so all can share.
>>
>> Yes, setQuadrantSegments is irrelevant if JOIN_MITRE is used.
>>
>> For an explanation of mitre limit see the Javadoc:
>>
>> http://tsusiatsoftware.net/jts/javadoc/com/vividsolutions/jts/operation/buffer/BufferParameters.html#setMitreLimit(double)
>>
>>
>> On Sun, Dec 1, 2013 at 8:44 AM, Brian Sanjeewa Rupasinghe <
>> [email protected]
>> > wrote:
>>
>> > Hi Martin,
>> >
>> > In the code i sent for setting parameters in buffering, i suppose
>> BufP.setQuadrantSegments(1)
>> > does not make any sense for Join_Meter style . What is meant by setting
>> a
>> > value to Default_Meter_Limit? Will it be more the value, more pointing
>> at
>> > corners??
>> >
>> > Cheers, Brian
>> >
>> >
>> > On Thu, Nov 28, 2013 at 10:10 PM, Brian Sanjeewa Rupasinghe <
>> > [email protected]> wrote:
>> >
>> >> Here is the method and the polygon i used with a +- 20 m distance.
>> >>
>> >> public static Geometry bufferPlusMinus (Geometry g, double dst1, double
>> >> dst2)
>> >> {
>> >> BufferParameters BufP = new BufferParameters();
>> >> BufP.setEndCapStyle(3);
>> >> BufP.setJoinStyle(2);
>> >> BufP.setQuadrantSegments(1);
>> >> BufferBuilder Buffb = new BufferBuilder(BufP);
>> >> Geometry BuffG = Buffb.buffer(g, dst1);
>> >> Geometry fp = Buffb.buffer(BuffG, dst2);
>> >> return fp;
>> >> }
>> >>
>> >>
>> >>
>> >>
>> >> POLYGON ((852.0508353104653 79.66036245972747, 785.3441701464214
>> >> -13.474425749638762, 721.4579830330817 -14.427950930434887,
>> >> 718.7632379569188 10.092344825531626, 718.535947988926
>> 20.8108253483052,
>> >> 739.5010955848701 12.351204388538228, 734.8751753004104
>> 4.721699044367739,
>> >> 776.4081693414112 6.153871252678144, 785.3441701464214
>> 12.270754131856343,
>> >> 831.0856877145211 70.0973126791213, 814.1664457949871 71.5685511069069,
>> >> 803.8677768004884 81.49941049445935, 852.0508353104653
>> 79.66036245972747))
>> >>
>> >>
>> >>
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>>
>> ------------------------------
>>
>> Message: 5
>> Date: Mon, 2 Dec 2013 22:50:56 +0000
>> From: Brian Sanjeewa Rupasinghe <[email protected]>
>> Subject: [Jts-topo-suite-user] DelaunayTriangulationBuilder snapping
>> tolerance
>> To: [email protected]
>> Message-ID:
>> <
>> caema-4irrhwbrq9zcjufabe_owixi_sbkc7s4q+f1bi+bsv...@mail.gmail.com>
>> Content-Type: text/plain; charset="iso-8859-1"
>>
>> Hi,
>>
>> I use DelaunayTriangulationBuilder class to run triangulation between
>> polygons and lines (about 2500 geometries) with lines used as constraint
>> edges. Initially i set the tolerance to a smaller value (0.001). For this
>> value, triangulation does not run. However, when i increased it to 3.1,
>> the
>> triangulation executed. This tolerance is for snapping according to JTS
>> API. I need to know what happens when the tolerance is increased. Will it
>> affect triangulation result? According to API, i suppose it is not, but to
>> deal with robustness issues. Further clarification is appreciated.
>>
>> Cheers, Brian
>> -------------- next part --------------
>> An HTML attachment was scrubbed...
>>
>> ------------------------------
>>
>> Message: 6
>> Date: Tue, 3 Dec 2013 11:21:19 +1100
>> From: Michael Bedward <[email protected]>
>> Subject: [Jts-topo-suite-user] Point to polygon distance in specified
>> directions
>> To: "[email protected]"
>> <[email protected]>
>> Cc: Trent Penman <[email protected]>
>> Message-ID:
>> <
>> cacjvtdou4jseh+sxl-otmrdybbku_eb-8w-cv7a+9e84aft...@mail.gmail.com>
>> Content-Type: text/plain; charset=ISO-8859-1
>>
>> Hi Martin,
>>
>> The following is a general algorithm query rather than a specific JTS
>> question - hope that's ok.
>>
>> I have a set of polygons which represent urban areas within a
>> fire-prone landscape. There are about 5000 polygons varying widely in
>> area, spatial extent, number of vertices and boundary complexity.
>>
>> I have the task of creating a regular grid of sample points within the
>> surrounding landscape and, for each point, determining the distance to
>> the nearest polygon within each of eight compass segments (ie. N to
>> NE, NE to E...). The results only need to be expressed as categorized
>> values based on a small number of distance cut-points.
>>
>> I've been trying to nut out something other than a brute force
>> approach to this without much success so far. One of the possibly less
>> brutish approaches I've thought of involves the following:
>>
>> 1. Split up the urban polygons by intersecting them with a regular
>> lattice, create PreparedGeometry objects for the resulting parts and
>> put them into an STRtree.
>>
>> 2. Construct a sampling template made up of polygons representing the
>> compass segments, each split according to the distance cut-points
>> (looking a bit like a dart board), possibly using a custom
>> CoordinateSequence to have vertex coordinates calculated on the fly
>> based on the centre coordinate.
>>
>> 3. For each sample point location:
>> For each compass segment:
>> For inner to outer segment part:
>> Query the spatial index with the segment part envelope
>> and, if any urban polygons are returned, test for
>> intersection.
>>
>> I'm sure there must be a better way. Any suggestions or comments will
>> be gratefully accepted.
>>
>> Michael
>>
>>
>>
>> ------------------------------
>>
>>
>> ------------------------------------------------------------------------------
>> Rapidly troubleshoot problems before they affect your business. Most IT
>> organizations don't have a clear picture of how application performance
>> affects their revenue. With AppDynamics, you get 100% visibility into your
>> Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics
>> Pro!
>>
>> http://pubads.g.doubleclick.net/gampad/clk?id=84349351&iu=/4140/ostg.clktrk
>>
>> ------------------------------
>>
>> _______________________________________________
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