# When Mapping Polygons surrounded by streets should they share nodes or be traced separately?

 12 3 When Mapping Polygons surrounded by streets should they share nodes or be traced separately? I don't know what the best practice is for parks or other polygons that are surrounded by streets, should it be traced around on it's own or should it be traced on top of the street nodes. This question has been bugging me for some time. Example This way Or this way asked 05 Nov '12, 18:33 redsteakraw 1.0k●17●24●37 accept rate: 22% aseerel4c26 ♦ 32.1k●16●239●551 Nearly the same question: is-it-okay-if-landuse-borders-share-nodes-with-streets-rivers. (22 Feb '14, 00:43) aseerel4c26 ♦

 10 This depends on personal preference. You will find people within OSM that will tell you either method is the only right one. They will have a load of arguments for their point of view too. There is no clear majority for either method. My personal POV is that when mapping in an area where there is already a lot of detailed data (e.g. in a well mapped city centre), then you should do the same. In other words trace separately. If you're mapping in the middle of nowhere and want to map the forest on one side of the road and the farmland on the other side of the road, then I would share the nodes. answered 05 Nov '12, 19:09 cartinus 7.0k●9●64●105 accept rate: 27% 1 Ah yes, I should have mentioned that there isn't a full concensus on this subject, instead of simply stating my POV. But hey, my POV is by definition the best one, right ? :p Now that we have a "no" and a "it depends" answer, maybe we need to add a "yes" answer. So that I can counter the arguments in the comments :p (05 Nov '12, 19:32) Vincent de P... ♦ 1 I agree, as I see you are interpreting sharing nodes of lines and polygons as an intermediate solution for less detailed areas (i.e. you do it like this because despite being less precise it is faster and you accept this compromise in order to get more mapping done). The conclusion on the other hand is that not sharing nodes is more precise and should be preferred when you have time. (04 Jul '13, 11:25) dieterdreist
 7 I'm a new mapper, but I would still strongly advise against sharing nodes between ways and areas because editing becomes much more difficult later for whomever. If some person later disconnects nodes on a way and one of those nodes is helping define an area, they may not realize that the area's node is also disconnected (it certainly is) and may well leave the area disconnected even if they re-connect the way since that may involve moving or recreating the node in question. I can tell you it's happened to me and I just count myself lucky that I happened to think about it later on and discovered what I had done and fixed it. It's more work making things parallel, but your polygons will be far less prone to accidental editing. answered 25 Jul '13, 05:22 Evan Edwards 130●1●3●5 accept rate: 0%
 3 I have tried both. Shared can look neater but it is a real pain to edit later.But,If you use Potlatch2, there is a parallel line tool in the tool box which you could find usefull. I haven't used it in this way yet but i will give it a go. The paralell tool as lots of less obvious uses, I have used it to make several identical buildings for example. answered 18 Dec '12, 12:07 andy mackey 11.7k●74●126●260 accept rate: 4% 1 It's also really handy if you're mapping areas like industrial sites with lots of storage tanks--you can roughly trace one, use the circle tool to make it a proper circle, then use the parallel tool to create more circles, even of different sizes. (19 Dec '12, 14:47) neuhausr
 0 It is the case for most mapping techniques that it is all up to the mapper. If you are mapping in an area with a number of contributions by another user, try and follow their standards for mapping. I like to follow the general rule that if I am creating an area that includes the grass buffer along the road , I go up to the road (ex: landuse=residential, landuse=commercial, leisure=park, other community-type things). If it does not include the grass buffer, I show it going up to its actual location (ex: landuse=farm, landuse=forest, natural=wetland, and other agricultural or natural areas). The only potential problem created by this for the mapper would be that you would then have to make sure that you reconnect nodes if you disconnect them. While I found this annoying at first, I quickly developed a habit of making sure that the nodes were connected again. answered 23 Feb '14, 05:02 ItalianMustache 201●10●11●17 accept rate: 0%
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question asked: 05 Nov '12, 18:33

question was seen: 8,065 times

last updated: 25 Feb '14, 09:55