pcav wrote > puoi descrivere in dettaglio l'operazione desiderata? > grazie. > > -- > Paolo Cavallini - www.faunalia.eu
scopo del gioco è trasformare una polyline chiusa in un poligono dxf o shape linestring come input (input) 1) [qgis dev] vector-->geometry tools-->lines to polygons (out_qgis_lines2polygon) 2) [saga 2.2.3] shapes-->polygons-->convert lines to polygons (out_saga2.2.3_lines2polygon) 3) [grass 7.0.3] v.type (out_grass7.0.3_v.type) 4) [arcview 3.1] xtools extension --> make polygons from line (out_arcview_xtools) come potete notare i primi tre danno lo stesso risultato; solo arcview dà il poligono corretto :-( polylines2polygons.zip <http://www.mediafire.com/download/tbutzmicq19bi1k/polylines2polygons.zip> ecco quanto riportato nel manuale dell'estensione xtools This script converts selected polylines in a theme to one single part polygon, and stores it in a new shapefile. If no polylines are currently selected, all polylines in the theme will be processed. The polylines do not need to be snapped together. Gaps between polylines will be bridged with a straight line. Source polylines can be single part, multi-part or mixed in the theme. Neither the order of the polylines in the FTab, nor the order in which the polylines are selected is important. If polylines from more than one theme will be used to build the polygon, the user will need to assemble the necessary polylines in a separate theme before running this script. A common example of this situation is the necessity to build a polygon from lines borrowed from PLS, Roads, Streams ... themes. If there are gaps between the source polylines that should not be bridged with a straight line, the user should digitize in polylines to fill the gaps prior to running the script. This script differs from the ArcInfo Build command (polygon option) in that only one polygon can be built in a single operation. XTools checks the input theme for intersections, places where lines cross without a break at the crossing point. XTools will break the lines at the crossing points, but this results in ''dangles'', pieces of line (usually short) that will create a problem in the output polygon if not eliminated. If intersections are detected, XTools will create a new polyline theme with the lines broken at crossing points and with the crossing points marked with a red graphic. The user needs to manually delete the dangles related to the line crossings and then rerun the script on the new polyline theme. -- View this message in context: http://gfoss-geographic-free-and-open-source-software-italian-mailing.3056002.n2.nabble.com/Problema-da-linee-a-poligoni-tp7595396p7595413.html Sent from the Gfoss -- Geographic Free and Open Source Software - Italian mailing list mailing list archive at Nabble.com. _______________________________________________ Gfoss@lists.gfoss.it http://lists.gfoss.it/cgi-bin/mailman/listinfo/gfoss Questa e' una lista di discussione pubblica aperta a tutti. I messaggi di questa lista non hanno relazione diretta con le posizioni dell'Associazione GFOSS.it. 808 iscritti al 30.01.2015