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/
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