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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'>I have a dataset of boundaries and centroids where sometimes centroids are missing because of digitizing errors. I tried to create new centroids using v.centroids, but that did not work (please see my message from May 12.)<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'>Then I tried to use v.category with options type=area and option=add along with cat=9000, and that works. I get new centroids with the desired cat values (up from 9000). The rest of the columns for the new centroids show NULL. Funny thing about the new centroids: they show up when viewing the map in QGIS or when using d.vect, but they are not visible when listing the table using db.select. I don't understand that.<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'>Now, I need to transfer the category values of the new centroids to another existing column, but that doesn't work. Here are the commands I tried one at a time:<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'>v.db.update map=inputmap, column='myCol', query_column='cat', where="cat >= 9000"<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'>db.execute sql="UPDATE inputmap SET myCol = cat WHERE cat >= 9000")<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'>Both commands don't work as expected. The values in "myCol" for the new centroids stay NULL, no matter what. When I set another filter (for example, cat >1), they both work fine for those centroids that were existing from the beginning - but not for the new ones. I also tried to insert random integer values into "myCol", but this also works only for the old centroids. The new ones don't accept changes.<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'>At least it means we have no syntax error or something like that.<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'>Any ideas what's wrong? Why are the new cents not completely accepted? Thank you very much!<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'>best regards, Uwe</span><span style='font-family:"Verdana",sans-serif;mso-fareast-language:DE'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>