Hi Stefan, thanks for the answer. I got so enough strategies to create polygons from points. I assume that probabily yours (or kosmo one, which is similar) are the easest way. Nevertheless I think I will organize a routine using tables to get WKT strings: my scope is to teach to students some basics of spatial geometry and WKT seems to get the point. regards
Peppe --- Mer 14/7/10, Stefan Steiniger <sst...@geo.uzh.ch> ha scritto: > Da: Stefan Steiniger <sst...@geo.uzh.ch> > Oggetto: Re: [JPP-Devel] How to import a table of polygons > A: "OpenJump develop and use" <jump-pilot-devel@lists.sourceforge.net> > Data: Mercoledì 14 luglio 2010, 20:04 > Hei Peppe, > > I have a tool too, which creates lines from points if an > attribute is > given that can be used for ordering (well.. assuming that > you load the > data in the correct order you could just create a new > attribute and > assign numbers in order). > > However, that would just create a line from all points, as > there needs > to be an indicator where the line is finished and a new > started. > > Getting polygons out of lines is simple with the planar > graph function - > more or less. > > stefan > > Giuseppe Aruta wrote: > > Hi London, > > thanks for your answer.ù > > Really I fegure out I can do it using a spreadsheet. > > The basic work is to transform, for instance, a > line coordinates: 0,0 0,2 2,2 2,0 0,0 into a wkt string: > Polygon ((0,0 0,2 2,2 2,0 0,0)). This is not difficult but > sometimes confusing and long. > > It would be interesting to explore a way that involve > OJ directly using table > > > > regards > > > > Peppe > > > > P.S. Francisco Helguera from SAIG wrote me that Kosmo > has a "Get > > lines from points" tool that should work - but no > import table. > > > > --- Lun 12/7/10, Sunburned Surveyor <sunburned.surve...@gmail.com> > ha scritto: > > > >> Da: Sunburned Surveyor <sunburned.surve...@gmail.com> > >> Oggetto: Re: [JPP-Devel] How to import a table of > polygons > >> A: "OpenJump develop and use" <jump-pilot-devel@lists.sourceforge.net> > >> Data: Lunedì 12 luglio 2010, 17:14 > >> Peppe, > >> > >> You'd have to specify the start and end of each > LineString > >> or Polygon > >> in the point file. So you'd need more than just > points, > >> you'd need > >> some other mark-up to. > >> > >> The text delimited point importer I built is made > to > >> separate out a > >> "linework code". Surveying software typically uses > the > >> linework code > >> input by the field surveyor to automatically > generate > >> linework. I > >> haven't bolted this functionality on to my point > import > >> tool, but it > >> can be done. > >> > >> The Sunburned Surveyor > >> > >> On Mon, Jul 12, 2010 at 6:16 AM, Giuseppe Aruta > <giuseppe_ar...@yahoo.it> > >> wrote: > >>> Hi all, > >>> tecnically Openjump/Skyjump and Kosmo have > many > >> strategies to import a set of coordinates as > points, either > >> using WKT structures or via tables. > >>> I just wonder if it is possible to import a > set of > >> coordinates (as table) and create directly > lines, closed > >> lines or polygons. > >>> Or to load a point layer and convert > them to a line > >> layer > >>> I checked around and I cannot find anything > but > >> digitalizing. > >>> I thank for the answers > >>> > >>> Giuseppe Aruta > >>> > >>> > >>> > >>> > >>> > >> > ------------------------------------------------------------------------------ > >>> This SF.net email is sponsored by Sprint > >>> What will you do first with EVO, the first 4G > phone? > >>> Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > >>> > _______________________________________________ > >>> 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 Sprint > >> What will you do first with EVO, the first 4G > phone? > >> Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > >> _______________________________________________ > >> 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 Sprint > > What will you do first with EVO, the first 4G phone? > > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > > _______________________________________________ > > 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 Sprint > What will you do first with EVO, the first 4G phone? > Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first > _______________________________________________ > 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 Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
