OpenStreetMap
I just noticed a big square on the online map "flooded" at some zoom levels - it's the same colour as the river. I guess a glitch in map data; I haven't looked with an editor. Yet.
(hmm, the "use map" feature didn't seem to save anything. I'll try adding lat/long in the boxes)
Discussion
Comment from acrosscanadatrails on 30 July 2009 at 01:20
Ya, that has todo with the coastline. Somewhere the coastline was probably broken. Once the proper landuse tags, and all the canvec data gets imported, it should be much better.
Also, the planet.osm file does diffs, rather than render the whole planet at once. I suspect it should be gone in a few weeks. (hopefully)
Cheers,
Sam
Comment from adaviel on 30 July 2009 at 01:49
Ah. So if I edit a riverbank and break it and leave a hole, the sea will get in ?
I did fix some banks on the Fraser, but near Ladner, and I'm fairly certain I just added some points and corrected placement, not broke/split/deleted anything.
Comment from Neil Penman on 30 July 2009 at 14:23
Hi,
It looks to me like it could be a problem with the islands in Harrison lake. They are tagged natural=water but I don't think they should be tagged at all. (Based on osm.wiki/Relation:multipolygon). As the water is on the right of the way the area floods. However I could be wrong, this flooding can be tricky.
Comment from Neil Penman on 30 July 2009 at 14:41
Ah OK, checking the map with the flood on it again its definitely not lake Harrison. Possibly Lake Samish. That currently has natural water on the right.
Comment from Neil Penman on 30 July 2009 at 22:43
I've made the boundary of Lake Samish clockwise. Hopefully that should fix it. However its a bit puzzling. The boundary was changed from coastline to natural=water on the 28th of July. I presume the direction of the way didn't change then. I can only think that the coastline renderer is smarter in working out that the area represented a lake.
Comment from Neil Penman on 31 July 2009 at 01:18
Nope it wasn't lake Samish. The problem is almost certainly due to the PGS data that has been used to represent the river that goes through Everson. There is a lot of coastline data that goes anti-clockwise. This will cause flooding. All that data should be deleted and replaced with waterway tags. It would be good also if the river had a name. Unfortunately coastline data is treated differently to any other data on the map. It is converted into shape files and loaded as a background but only intermittently. So even after you delete it all and replace it with a river, it still may not show up on Mapnik as fixed for some weeks.
I'm not a local so I haven't deleted the coastline data that appears to be in error.