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Hello, Recently I noticed that one of the lakes in my area is not drawn properly on the standard map - no blue at all, it's marked as "meadow" or something. Shows fine in bicycle/transport/mapquest map. This is Anderson Reservoir, in the middle of the map here: http://www.openstreetmap.org/?lat=37.1694&lon=-121.6205&zoom=14&layers=M I checked things with JOSM - the lake seems to be a closed polygon, clockwise direction, looks fine to me. There are some complex overlapping polygons that I guess cause the problem, but I don't dare attempt this complex an edit without understanding the problem first. Can somebody more experienced in OSM matters take a look? Regards,
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I certainly wouldn't delete the untagged way - you can see in that screenshot that it's part of a multipolygon relation!
(24 Mar '13, 09:05)
Andy Allan
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Additionally ways without tags and without being member of any relation are rarely a problem, if ever.
(24 Mar '13, 09:44)
scai ♦
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There appears to be two polygons around the lake one tagged lake the other without any tags,which I think may be the problem. I would be reluctant to delete the blank one as it would been difficult to re-do. I use potlatch2 but I believe it is easier to retain the polygon on your PC to put back if necessary if you are using JOSM. Hopefully a more experienced mapper will know the safe procedure. here is the blank polygon. 
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Yes, the rendering problems are caused by several areas which are overlapping with the lake. Most of the lake is covered by this area, for Anderson Lake County Park: way 28461629. This is tagged as Also the lake is surrounded by a way which is an outer part of relation 1696825. This relation is tagged as It would be worth contacting the user who originally added this (nmixter), or discussing it on the talk-us mailing list, to agree how these areas should be mapped and tagged. |
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Hi the Anderson lake should be tagged as inner polygon inside the leisure park just to appear properly now it seems the be partly green park. The Coyote lake is partly a 2 (broken) multipolygon and should be tagged inner (natural water) and outer (park) in the advanced menu P2. What’s the use of the thin line (multipolygon with 95 others) following the waterline more or less ? Whats the main outer polygon ? Or just ask the editor nmixter why it has be done ? By sending the last editor a simple mail with your remarks. It might get you an answer as well ! And MK 408 as well for the southern lake. You can find or identify the editor by using the button H if the node or nodes are marked. In JOSM its on the right in the scrolling menus. Greetz Should the outer polygon totally contain the inner one? which it doesn't in this case as we can see the white area on the map. If only half the lake is in the park should the lake be in two sections? good point about contacting mapper. Maybe part of blank polygon could be used take the park polygon around the edge on the lake??
(22 Mar '13, 12:22)
andy mackey
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I have just compared the mapping (in PotLatch2) of your lake with the mapping of Coyote Reservoir which is to the South East. The only difference is that Coyote Reservoir has a Multipolygon relation, with an ID and Role is set as Outer (Ditto this for Lake Windemere, Cumbria, UK) whereas Anderson Reservoir appears to have this Relation missing. Not sure if this is a solution or not. |
Thanks everybody.
I'll first talk to nmixter and if necessary will try fixing the polygons myself (first backing up the data with JOSM).
Thanks,