Hi Jukka, Thanks for the link. I'm not familiar with this data and there seem to be a lot of choices. Can you tell me which one might be closest to Arnd's problem?
regards, Larry On 10/4/07, Rahkonen Jukka <[EMAIL PROTECTED]> wrote: > > Hi Larry, > > Perhaps Geonames database http://www.geonames.org/export/ has enough > points for testing. > > > -Jukka- > > ------------------------------ > *Lähettäjä:* [EMAIL PROTECTED] [mailto: > [EMAIL PROTECTED] *Puolesta *Larry Becker > *Lähetetty:* 4. lokakuuta 2007 16:17 > *Vastaanottaja:* JUMP Users Discussion > *Aihe:* Re: [jump-users] Better Performence for point data > > I'm going to start investigating the point performance problem as soon as > I get some test data. I have been trying to locate a large point dataset on > the web, but no luck. Perhaps the best approach might be to add a new item > to the Generate menu, "Random Points". > > @Arnd: One thing that people often forget about JUMP is that rendering is > a background process. You don't have to wait for it to finish to start the > next operation. > > What kind of terrain maps are you generating? Are you generating contour > lines from a grid of points? You mentioned deleting selected points being > impossibly slow. I don't see why this should be so. If I can duplicate the > problem, it should be an easy fix. > > regards, > Larry > > On 10/2/07, Larry Becker <[EMAIL PROTECTED]> wrote: > > > > HI Arnd, > > > > Would it be helpful to work around the problem by saving the points as > > a shapefile and using a utility like shp2tile to break the point data up > > into multiple files? > > > > see: http://imaptools.com/download-software.html > > > > regards, > > Larry > > > > On 10/2/07, Arnd Kielhorn < [EMAIL PROTECTED] > wrote: > > > > > > Hello Paul, > > > > > > thank You for the tip with the z-value, but how I can use it as a > > > z-value on the point itself? > > > > > > The file fomrat is txt, csv (from PIROL CSV-Format) like following > > > example > > > $Rechts Hoch heigh > > > $grad grad m > > > $double double double > > > 3434000.00 5800000.00 93.78 > > > 3434001.00 5800000.00 93.84 > > > ... ... ... > > > > > > or the ESRI ascii grid format asc (reading plugin from SIGLE). > > > The most files I got have 1 million points and such csv files have > > > about > > > 30 MB. > > > In my start file for OJ I got 768 MB, because I have 1 GB RAM. > > > > > > Kindly regards > > > Arnd > > > > > > > > > Paul Austin schrieb: > > > > Arnd, > > > > > > > > What file format are you using? > > > > > > > > As JUMP loads the whole file into memory I would recommend setting > > > the > > > > heap size on the JAVA VM to be -Xmx512M if you are dealing with > > > large > > > > datasets. > > > > > > > > You mentioned that the height is an attribute on the feature, if you > > > use > > > > the height as a z-value on the point itself there will be some > > > memory > > > > savings. > > > > > > > > Paul > > > > > > > > Arnd Kielhorn wrote: > > > > > > > >> Hello Larry, > > > >> > > > >> as in the further discussion just named the main problema are (for > > > >> example I just have to work with point layers with only a heigh > > > >> attribute but with 1 million points; but also e.g. 300,000 points > > > are > > > >> enough): > > > >> - (re)drawing of the points > > > >> - strongly restricted or impossible operation (e.g. deleting some > > > >> points/vertices after marking them; e.g. copying hundreds or a few > > > >> thousand in a new layer to have layer with lesser points) > > > >> Very often OJ hangs on and I have to restart it. > > > >> I use such point layers for creating a digital terrain maps. > > > >> > > > >> Kindly regards > > > >> Arnd > > > >> > > > >> Larry Becker schrieb: > > > >> > > > >>> Hi Arnd, > > > >>> > > > >>> I haven't worked with large point datasets much. What it is > > > >>> exactly that is slow? Is it redraw time? Or perhaps the > > > particular > > > >>> operation that you are doing? > > > >>> > > > >>> I know that point layers do not benefit from the recent > > > decimation > > > >>> optimization, so they take longer to draw than equivalent polygons > > > >>> and polyline layers. I think Michaël tried a point decimation > > > >>> optimization, but wasn't satisfied with the results. > > > >>> > > > >>> regards, > > > >>> Larry Becker > > > >>> > > > >>> On 10/1/07, *Stefan Steiniger* < [EMAIL PROTECTED] > > > >>> <mailto: [EMAIL PROTECTED]>> wrote: > > > >>> > > > >>> mhm > > > >>> from my point of view it is both OJ and JRE. It would be > > > probably > > > >>> better > > > >>> when the points are stored and processes in a database. > > > >>> > > > >>> stefan > > > >>> > > > >>> Arnd Kielhorn schrieb: > > > >>> > Hello, > > > >>> > > > > >>> > yes I know, first of all OJ is a GIS for vector data. But > > > the > > > >>> > functionality is also very good for point datasets. But > > > working > > > >>> with > > > >>> > great point datasets (more 500,000 points) bring problems > > > with the > > > >>> > memory and the garbage collector works not satisfied. Every > > > >>> command take > > > >>> > a lot of time or could not carried out. (CPU P4 2.4 GHz, 1 > > > GB RAM) > > > >>> > Is it only a thing of the JRE or also from OJ? > > > >>> > So, it is useful to know if there is a chance to increase > > > the > > > >>> > performence of OJ in this case and what could be the > > > possible > > > >>> milestones > > > >>> > to reach this aim? > > > >>> > I am very eager to read everyones opion. > > > >>> > > > > >>> > Kindly regards > > > >>> > Arnd > > > >>> > _______________________________________________ > > > >>> > jump-users mailing list > > > >>> > [email protected] > > > >>> <mailto: [email protected]> > > > >>> > http://lists.refractions.net/mailman/listinfo/jump-users > > > >>> > > > > >>> > > > > >>> _______________________________________________ > > > >>> jump-users mailing list > > > >>> [email protected] > > > >>> <mailto:[email protected]> > > > >>> http://lists.refractions.net/mailman/listinfo/jump-users > > > >>> <http://lists.refractions.net/mailman/listinfo/jump-users > > > > >>> > > > >>> > > > >>> > > > >>> > > > >>> -- > > > >>> http://amusingprogrammer.blogspot.com/ > > > >>> > > > ------------------------------------------------------------------------ > > > >>> > > > >>> _______________________________________________ > > > >>> jump-users mailing list > > > >>> [email protected] > > > >>> http://lists.refractions.net/mailman/listinfo/jump-users > > > >>> > > > >>> > > > >> _______________________________________________ > > > >> jump-users mailing list > > > >> [email protected] > > > >> http://lists.refractions.net/mailman/listinfo/jump-users > > > >> > > > > > > > > > > > > _______________________________________________ > > > > jump-users mailing list > > > > [email protected] > > > > http://lists.refractions.net/mailman/listinfo/jump-users > > > > > > > > > > > > > > _______________________________________________ > > > jump-users mailing list > > > [email protected] > > > http://lists.refractions.net/mailman/listinfo/jump-users > > > > > > > > > > > -- > > http://amusingprogrammer.blogspot.com/ > > > > > -- > http://amusingprogrammer.blogspot.com/ > > > _______________________________________________ > jump-users mailing list > [email protected] > http://lists.refractions.net/mailman/listinfo/jump-users > > -- http://amusingprogrammer.blogspot.com/
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