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</o:shapelayout></xml><![endif]--></head><body lang=DE link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'>Hello list,<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'>I have a line shapefile (call it input.shp, derived from polygons) that i'd like to turn it into clean lines (output.shp) using the processing toolbox (PT). Clean lines means: no duplicates, broken at intersections. Dangles and pseudo nodes are uninteresting here.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'>In my understanding, it's necessary to perform the following steps: 1. snap vertices together within small threshold, 2. break lines, 2. remove duplicates.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'>After entering my values and options in the v.clean.advanced input mask of the PT, some problems and questions come up (I tried QGIS 2.10 and 2.12 on Windows):<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-family:"Verdana",sans-serif'>the PT input mask does not accept more than one value in the input field for threshold. In fatal contrast to that, in the help text it reads that there have to be multiple threshold values entered if multiple cleaning tools are used. In my case, the box doesn't accept a comma separator nor an additional numeric value.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-family:"Verdana",sans-serif'>the system puts together a command string (found in PT history) containing values I never did enter and I don't want to use:<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal style='margin-left:35.4pt'><i><span style='font-family:"Verdana",sans-serif'>processing.runalg("grass:v.clean.advanced","D:/input.shp","snap,break,rmdupl",0.01,"655282.346386,662305.603469,5871019.54139,5877018.65557",-1,0.0001,"D:/output.shp",None)<o:p></o:p></span></i></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-family:"Verdana",sans-serif'>please note the above values before „D:/output.shp“: they smell like default values for snapping and small area threshold, but I never did choose those values! Where the hell do they come from?<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l1 level1 lfo2'><![if !supportLists]><span style='font-family:Symbol'><span style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span style='font-family:"Verdana",sans-serif'>the result is poor: lines are not broken and dups are not removed.<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'>Does anybody know what went wrong?<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana",sans-serif;mso-fareast-language:DE'>Best regards, Uwe<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>