OpenGeofiction
I have been puzzled for a while by this: http://opengeofiction.net/#map=18/-45.70595/70.17565
There is a white ‘island’ here, but in JOSM there are no nodes or coastline ways there. It is over a month since I changed it. Originally it was a district maritime boundary which I managed to accidentally tag as natural=coastline. But although I’ve removed the coastline tag - and shifted the way slightly - the white area remains. So it looks to me as if the render hasn’t updated on this bit of coastline. Can anyone tell me why, and if there is a way to fix it?
Discussion
Comment from Luciano on 23 July 2016 at 12:24
I have seen problems like this before. I can’t say I understand the technical issue well, but it has to do with how the coastline render decides it needs to update a given tile. We had been having serious problems with the coastline render failing, a while back, so Thilo did some optimization. The consequence, however, is that sometimes changes to coastline objects seem to get missed entirely. I struggled with a certain bay in Commonia for almost a month trying to figure out how to get the render to recognize that edits had happened. Finally, I had success by doing the following:
Deleting ALL the ways that had the tag “natural=coastline”, both in the current moment but also any and all ways that had borne that tag at any point in the past. I replaced the ways in question with completely new ways with new tags, exactly parallel to the deleted ones. I used the way_id values to make sure all my ways were new.
It’s tedious, but it definitely solved the problem.
Comment from Ūdilugbulgidħū on 23 July 2016 at 12:37
Thanks Luciano.
How big an area to do this over? Since its an island, I’ve just deleted the way that makes up the island and the boundary way and replaced them as you suggested. Because there are around 900 islands in Shadze-Ma, it would be too much to do it over the whole country. I also realise I have missed adding this way to the land_area relation for Shadze-Ma, perhaps that may be another underlying cause.
Comment from Luciano on 23 July 2016 at 14:08
Definitely only focus on areas where you’re seeing the render problem. No need to re-do areas where you’re not seeing problems.
Comment from Ūdilugbulgidħū on 24 July 2016 at 11:11
It is resolved - the white blob is no more. I only deleted the 2 ways that made up the actual island, then replaced them. That was enough, just took a while to update. Thanks Luciano.