Erwan, What is the CDT that you refer to?
The Sunburned Surveyor On Wed, Apr 16, 2008 at 5:10 AM, erwan bocher <[EMAIL PROTECTED]> wrote: > 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 > > >>>> > > >> __________________________________________________ > > >> Do You Yahoo!? > > >> Tired of spam? Yahoo! Mail has the best spam protection around > > >> http://mail.yahoo.com > > >> > > >> > ------------------------------------------------------------------------- > > >> This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > > >> Don't miss this year's exciting event. There's still time to save $100. > > >> Use priority code J8TL2D2. > > >> > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > > >> _______________________________________________ > > >> Jump-pilot-devel mailing list > > >> Jump-pilot-devel@lists.sourceforge.net > > >> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > >> > > >> > > >> > > > > > > > ------------------------------------------------------------------------- > > > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > > > Don't miss this year's exciting event. There's still time to save $100. > > > Use priority code J8TL2D2. > > > > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > > > _______________________________________________ > > > Jump-pilot-devel mailing list > > > Jump-pilot-devel@lists.sourceforge.net > > > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > > > > > > > > > > > -- > > 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 > > > > > > > > > > ------------------------------------------------------------------------- > > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > > Don't miss this year's exciting event. There's still time to save $100. > > Use priority code J8TL2D2. > > > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > > _______________________________________________ > > Jump-pilot-devel mailing list > > Jump-pilot-devel@lists.sourceforge.net > > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > > > > > -- > 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 > ------------------------------------------------------------------------- > This SF.net email is sponsored by the 2008 JavaOne(SM) Conference > Don't miss this year's exciting event. There's still time to save $100. > Use priority code J8TL2D2. > http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > > ------------------------------------------------------------------------- This SF.net email is sponsored by the 2008 JavaOne(SM) Conference Don't miss this year's exciting event. There's still time to save $100. Use priority code J8TL2D2. http://ad.doubleclick.net/clk;198757673;13503038;p?http://java.sun.com/javaone _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
