Dear OpenJumper,
We are working at IRSTV on a CDT api in JAVA. The api will integrate some
functionalities like insert polygon with hole, node, line and skeleton
refinement. It's a transposition of my thesis work in pure java.
Feel free to send me a mail.
R1.
2008/4/16, Geoffrey G Roy <[EMAIL PROTECTED]>:
>
> Dear SS (and others)
>
> Could you let me know ehat the status is for the use of Java 1.6 - has a
> decision been made to move OpenJump, or is it still a work in progress.
>
> Geoff
>
>
> Stefan Steiniger wrote:
> > Hei Christopher
> >
> > thanks for your outline :)
> > I actually have not that much background knowledge to evaluate if what
> > you do propose is good, but I guess you know it better. But modularity
> > is always a plus and documentation is sufficient. However.. a good rule
> > is to always start with a simple model and extend it later. I.e. one
> > could also make first all in one and then introduce modularity later.
> >
> > btw. Today I just stumbled across this article that has been published
> > this month:
> > "Sweep-line algorithm for constrained Delaunay triangulation"
> >
> http://www.informaworld.com/openurl?genre=article&issn=1365%2d8816&volume=22&issue=4&spage=449
> >
> > If there is need I can send it to you. Note, that it is a 2D algorithm
> > (brwosing the article shortly). I actually have needs too for 2D CDT's..
> > in map generalization.
> >
> > cheers
> > stefan
> >
> > Christopher wrote:
> >
> >> Sorry for the radio silence, I've been a thinking
> >> philosopher not an eating philosopher. I can only hope
> >> a fork and food are there when I need them ;)
> >>
> >> I've been reading the papers of the computational
> >> geometry "heros" and thinking of an overall framework
> >> for the TIN side of things. I just got my copy of
> >> "Foundations of Multidimensional and Metric Data
> >> Structures" by Hanan Samet yesterday and it is already
> >> proving a valuable resource.
> >>
> >> Broadly speaking, I want to structure the TIN
> >> import/creation side as a serial chain. Each node in
> >> the stream would either gather statistics about the
> >> stream flowing through it, alter the input stream into
> >> an changed version of the current type of stream, or
> >> alter the input stream into a different kind of output
> >> stream altogether.
> >>
> >> Suppose we had defined streams of DataSource (file,
> >> database, WMS, etc), Geometry, Point, LineString,
> >> GeometryCollection, and TINface. Then we can have a
> >> bunch of small modules that process these streams in
> >> different ways that can then themselves be combined in
> >> different ways given the need. For instance, one
> >> module could take an I/O stream from a USGS NED .bif
> >> elevation file then output a stream of Points. Another
> >> module could take a stream of Points, perform a simple
> >> random insertion Delaunly algorithm, then output a
> >> stream of TINfaces. The final module down the line
> >> would take the TINfaces and output an instance of a
> >> TIN. An alternate final module could take save the TIN
> >> to a file or even a database.
> >>
> >> Some benefits of this structure include:
> >> * being able to use the same module in very different
> >> types of chains.
> >> * modules in each layer (ie you could have different
> >> Delaunly algorithms for PointStream -> TINface
> >> transition) could be easily swapped around, making
> >> this a great research platform.
> >> * by using Paul's JCSP lib, the different nodes on a
> >> stream could be run concurrently allowing for
> >> wonderful scaling on today's multi-core,
> >> multi-processor machines.
> >> * it should work equally well for a small NED data set
> >> imported into memory or a huge raw LIDAR DEM file
> >> saved into a PostGIS database.
> >>
> >> Right now, I'm reading my eyes out and trying to
> >> figure out what kind of streams and data structures
> >> will be needed to be able handle any kind of TIN
> >> importation tasks might be needed by anyone, anywhere,
> >> in any java GIS project. I also have finals going on,
> >> so don't expect any worknig code in the next week or
> >> so.
> >>
> >> As far as future funding, I'm going forward as if
> >> everything will go through fine and no checks will
> >> bounce. I'll probably still work on the project if
> >> something goes wrong, but the manhours will be much
> >> less given that I'll have to find other work for the
> >> summer.
> >>
> >> --Christopher
> >>
> >>
> >>
> >> --- Sunburned Surveyor <[EMAIL PROTECTED]>
> >> wrote:
> >>
> >>
> >>> Paul,
> >>>
> >>> Thanks for the link on JSR-275. That looks very
> >>> interesting, and
> >>> surprisingly simple. I just skimmed through the
> >>> introduction of the
> >>> JavaWorld article, but I will read it in more detail
> >>> this weekend. I
> >>> think I can incorporate it into the code I'm already
> >>> working on.
> >>>
> >>> Stefan and Chris,
> >>>
> >>>
> >>> I explained to Chris the conditions that must be met
> >>> before we are
> >>> accepted. I think he has a good understanding of
> >>> these. It seemed from
> >>> our early e-mails that he was eager to move forward.
> >>> Stefan is correct
> >>> in that we do not have a gaurantee of acceptance or
> >>> payment from
> >>> Chris' work. He would be working as a volunteer like
> >>> the rest of us
> >>> for the time being.
> >>>
> >>> The Sunburned Surveyor
> >>>
> >>> On Fri, Apr 11, 2008 at 11:31 AM, Stefan Steiniger
> >>> <[EMAIL PROTECTED]> wrote:
> >>>
> >>>> Question.. is Chris accepted, i.e. will he get a
> >>>>
> >>> grant by GSofC?
> >>>
> >>>> Otherwise it is his decision to work on it or not
> >>>>
> >>>> stefan
> >>>>
> >> __________________________________________________
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>
> --
> Dr Geoffrey G Roy
> Cadplan
> 129 Gloster Street, Subiaco WA 6008
> Tel: (08) 9381 4870 Fax: (08) 9382 4459
> Email: [EMAIL PROTECTED]
> http://www.cadplan.com.au
>
>
>
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--
Docteur en géographie,
spécialité géomatique
École Centrale de Nantes
Institut de recherche en sciences et techniques de la ville
http://www.irstv.cnrs.fr/
http://geosysin.iict.ch/irstv-trac/wiki
http://r1.bocher.free.fr
http://www.projet-sigle.org
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