My pleasure, Dave! I'm glad to have helped even a little. :-) Here's another short (2:25) video showing how I use the Relation Editor window to sort and find disconnected segments: https://youtu.be/87nRQHuatOE
Cheers! Adam On Wed, Oct 24, 2018 at 9:35 AM Dave Swarthout <[email protected]> wrote: > They say a picture is worth a thousand words and IMO that video says > bushels about mapping relations. I was always a bit scared when fooling > with them because as it turns out, their reputation is worse than the > reality. The Reltoolbox is similar to the normal relation editor as Kevin > points out but for me it makes the task ever so much faster. You can move > along picking up pieces of whatever multipolygon you're constructing and it > just magically adds them. I have one place where the same way is used for a > place=island with its name, a NWR boundary, a wood multipolygon and a sand > multipolygon. Freakin' awesome! I've learned more in the past day while > mapping islands in the Kodiak Archipelago than in the past 5 years of > working with multipolygons. > > Now all we need is a video tutorial showing how to analyze one during a > debugging episode. Talk abut sorting, perhaps, an a walk through of a > session where there is a "gap" in some relation that you cannot locate. > What techniques and/or tools would one use in that case? And what about > those little squiggles that appear at the end of each member's line in the > relation editor. I know they indicate connectivity (a closed loop?) but > what do you do if there is a problem, a "gap."?? > > Anyway, thanks again to Adam. You've advanced my understanding immensely. > > Dave > > On Tue, Oct 23, 2018 at 10:39 PM Kevin Kenny <[email protected]> > wrote: > >> On Mon, Oct 22, 2018 at 12:36 PM Adam Franco <[email protected]> >> wrote: >> >>> Hi Dave, all, >>> >>> Based on this discussion I just recorded this short tutorial >>> <https://youtu.be/x7SPb0JtheA> of how I use JOSM and its Relation >>> Toolbox plugin to to add adjoining land-cover areas as multipolygons with >>> shared boundary ways to reduce duplication and overlapping ways. >>> >> >> Thanks for recording that! Now I don't have to. :) >> >> Your workflow is essentially the same as mine, except that I use the >> regular old relation editor to add and delete ways. Works well enough for >> me, and I think it's only one or two clicks more than what you're doing. I >> also make a lot of use of 'replace geometry' from utlilsplugin2, since a >> lot of what I'm editing was born as imports and is being replaced with >> updated data from the same sources. Yes, I'm very careful not to step on >> the work of local mappers when I do it. >> >> Depending on what's going on in the field, I might have called that >> hedgerow a tree_row or a hedge and used a linear feature to map it. >> Similarly, at breaks in tree cover for things like power lines and >> pipelines, I might use man_made=cutline. Speeds up the process a little bit >> more. For what it's worth, I tend to restrict the 'cutline' tag to a >> standard (in NY) four-rod right-of-way; if the cutting is larger than that, >> it gets a polygon. >> >> Hopefully this will begin to show that for complex landcover, or >> similarly complex admin boundaries, that multipolygons with shared ways are >> actually quicker and easier to maintain than simple areas. I know that >> they're still controversial, even among experienced mappers, but for >> something complicated like West Point >> https://www.openstreetmap.org/relation/175474, with a whole bunch of >> shared borders, rights-of-way cut out of it and what not, I'd be really >> handicapped without shared ways. I didn't get very far on the landcover >> because I seldom map landcover other than in my own neighbourhood or when >> fixing other people's mistakes. >> _______________________________________________ >> Tagging mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/tagging >> > > > -- > Dave Swarthout > Homer, Alaska > Chiang Mai, Thailand > Travel Blog at http://dswarthout.blogspot.com > _______________________________________________ > Tagging mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/tagging >
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