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Re: [JPP-Devel] How to add vertices for making adjacent polygons to suit?
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From: Rahkonen J. (MML) <juk...@ma...> - 2015-03-27 12:17:52
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Hi, The Adjust polygon boundaries tool did help a lot even it could not resolve all the problems in my real world data. Perhaps I will find some time to find exact cases when it fails. Tool can do all that it promises. It closes the gaps, resolves overlaps, and it is also adding vertices into the geometries. After running the process I could find the remaining problems by running analysis Find coverage gaps and Find coverage overlaps. See the attached images. For making the work even more fluent it would be nice to make the Add vertex tool to snap to existing vertices of other features if desired. Now I had to add vertices to the line first with an offset from the final place and then slide the new vertex with the Move vertex tool when it does snap. About snapping, the Draw point tool does not give any hint before about if it is going to snap of afterwards. With the Draw line and Draw polygon tools the digitizing line jumps to vertex when it is at the snap distance. Any idea about how to give such feedback with the Draw point tool? Affects Add vertex tool as well. -Jukka Rahkonen- ________________________________ Michaël Michaud wrote: > Hi, > The plugin Andrei is refering to is issued from JCS. It is a complex piece of code from Martin Davis. I tried to complete it (to hold holes for example), but it is still not working in every situation. If you use it, please report any problem. > I think the final line should pass through all vertices of the first ring, all vertices of the second ring, plus projections of first ring vertices onto second ring, plus projections of second ring vertices onto first ring. Michaël Le 26/03/2015 18:17, Andrei Nacu a écrit : OK. I thought the polygons were topologically accurate and only the number of vertices was not matching. I don't know how the polygon boundaries are adjusted. I think Mike can tell you better (he made the plug in). Ideally, the polygon with more vertices and, consequently, a higher level of detail should serve as reference. But we also have cases when the polygons simply have gaps and overlaps because of some excessive generalization or bad digitalization. Andrei On Thursday, March 26, 2015 7:05 PM, Giuseppe Aruta <giu...@ya...><mailto:giu...@ya...> wrote: If there is a small distance or an overlap, I feel it is quite complicated to define common border between the polygons. A medium point between the two borders? Or the border of one of the polygon that should consider as the "valid" one? 2015-03-26 10:40 GMT+01:00 Rahkonen Jukka (MML) <juk...@ma...<mailto:juk...@ma...>>: Hi, I have a polygon layer where the common borders do not always have exactly same vertices. I try to show the case as ASCII: A: ---x---x---x------x B: ---x-------x---x--x Do we have to tool that can add nodes to polygon boundaries so that after the operation both A and B would have 5 same vertices? The Noder tool with Snap-Rounding does not feel quite right because I feel that it may move the existing nodes a bit. Notice that usually there is no intersection where the node is missing but there is a small distance across an overlap or gap area to the other line. -Jukka Rahkonen- ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Jump-pilot-devel mailing list Jum...@li...<mailto:Jum...@li...> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Jump-pilot-devel mailing list Jum...@li...<mailto:Jum...@li...> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel ------------------------------------------------------------------------------ Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ _______________________________________________ Jump-pilot-devel mailing list Jum...@li...<mailto:Jum...@li...> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel |