<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>On Feb 16, 2009, at 9:34 PM, ambrish dhaka wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Arial; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div class="hmmessage" style="font-size: 10pt; font-family: Verdana; ">Thanks! John,<br>Actually the two are independent queries, but yes I have been interchangeably trying to create polygons in QGIS and GRASS as well. The problem is that in QGIS when there is commoon boundary between two polygons it is actually double. And, if by chance it is disturbed then you never get the original one, besides why there should be this doubling. This does not happen in arcgis.<span class="Apple-converted-space"> </span><br>ANy solutions to this?<br>regards,<br>Ambrish<br><br></div></span></blockquote><div><br></div><div>I'm afraid this is something that will have to be addressed in future development efforts. I agree that this is problematic as dashed lines often appear as solid due to being drawn more than once. Perhaps the new symbology work will not have shared boundaries overlap, but I am not certain if this has been brought up before. There are others who would know better than I.</div><div><br></div><div>Regards,</div><div>John</div><br><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Arial; font-size: 14px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0; "><div class="hmmessage" style="font-size: 10pt; font-family: Verdana; ">> CC:<span class="Apple-converted-space"> </span><a href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>;<span class="Apple-converted-space"> </span><a href="mailto:giohappy@gmail.com">giohappy@gmail.com</a><br>> From:<span class="Apple-converted-space"> </span><a href="mailto:john.tull@wildnevada.org">john.tull@wildnevada.org</a><br>> To:<span class="Apple-converted-space"> </span><a href="mailto:ambijat@hotmail.com">ambijat@hotmail.com</a><br>> Subject: Re: [Qgis-user] centroid<br>> Date: Mon, 16 Feb 2009 18:24:36 -0800<br>><span class="Apple-converted-space"> </span><br>> I think this is the solution you wanted. You were not clear about<span class="Apple-converted-space"> </span><br>> doing this with the GRASS Tools plugin in qgis, but your followup<span class="Apple-converted-space"> </span><br>> question on watershed creation seems to indicate that is your desire.<br>><span class="Apple-converted-space"> </span><br>> To aid in getting useful recommendations, please be more specific in<span class="Apple-converted-space"> </span><br>> your requests, including the operating system, version of qgis, and<span class="Apple-converted-space"> </span><br>> anything else that is pertinent, like using GRASS Tools.<br>><span class="Apple-converted-space"> </span><br>> Regards,<br>> John<br>><span class="Apple-converted-space"> </span><br>> On Feb 16, 2009, at 2:47 PM, G. Allegri wrote:<br>><span class="Apple-converted-space"> </span><br>> >> is there any autocomplete<br>> >> for a line to create polygons from lines to adjacent polygon.<br>> ><br>> > In GRASS you can use:<br>> ><br>> > # v.type in=input_lines out=output_boundary type=line,boundary<br>> ><br>> > and then add centroids to the created boundaries with something like<br>> > (I'm going with memory, you should check the command syntax):<br>> ><br>> > # v.centroids input=output_boundary output=output_polygon option=add<br>> ><br>> > Obviously you have to check the topology results at then end. It's up<br>> > to you to have a consitent starting line vector (closed arcs, islands,<br>> > etc.), otherwise you will have to correct it with the usual commands<br>> > (v.clean, vlbuild, etc.)<br>> > _______________________________________________<br>> > Qgis-user mailing list<br>> ><span class="Apple-converted-space"> </span><a href="mailto:Qgis-user@lists.osgeo.org">Qgis-user@lists.osgeo.org</a><br>> ><span class="Apple-converted-space"> </span><a href="http://lists.osgeo.org/mailman/listinfo/qgis-user">http://lists.osgeo.org/mailman/listinfo/qgis-user</a><br>><span class="Apple-converted-space"> </span><br><br><hr>MSN Technology brings you the latest on gadgets, gizmos and the new hits in the gaming market.<span class="Apple-converted-space"> </span><a href="http://computing.in.msn.com/" target="_new">Try it now!</a></div></span></blockquote></div><br></body></html>