In January I proposed cleaning up a lot of imported CLC06 data manually to preserve the OSM ecosystem. Mappers had a hard time working with the large multipolygons and tools such as Tilemill/Mapbox Studio/iD all had rendering issues. Because of those issues the multipolygons become even more broken by mappers trying to handle them.

The two main multipolygons had areas about 80x120KM.

Removed

Today I removed the last major imported multipolygon(the east one). The first one I removed all way back in January, then I spend about a month mapping all the forest back from scratch. I moved on to the next multipolygon and ran into ±5.0 × 10−324 to ±1.7 × 10308 errors and moved on to do other things.

I learned some more powerful Overpass queries and earlier this Sunday morning I pulled the trigger on the second multipolygon, done in less then five minutes. I brutally smashed some “smaller” low quality CLC06 multipolygons into nothing.

Imported CLC06 multipolygons, currently:

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When I first got involved in OpenStreetMap all my mapping was done in the iD editor, a great user experience for new users easy to work with and tagging made easy. My first experience with iD and OSM was terrible. It was because of a old low quality forest import that covers a huge area, shown below.

Most of the import is two massive multipolygons with tons of relations. In iD it was impossible to merge other areas into the multipolygons and the forests had to be heavily remapped. The result of other mappers ways to deal deal with this has lead to two massive multipolygons with broken relations, resulting in rendering issues. First image below shows the quality of the import, the second shows a rendering issue in iD as a result of broken relations(Not related to the reverse inner bug).

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This post was first published 26th October 2014 at my blog.

Untill today Nyköping has been having the status of “decent”. The list of cities in Sweden and their status can be found on the Wiki(WikiProject Sweden/Cities). After many hours of mapping yesterday, I changed the status to “completed”(for car navigation). The description of the completed status states “All public roads should be mapped. Roads should be tagged with name and driving restrictions should be fully mapped.”.

I decided when I saw the status table at the wiki yesterday that the task for the weekend should be to make sure that Nyköping could be given the status completed. I saw it as a easy task as we have been spending a loot of time on mapping buildings downtown but I did knew that some roads was missing names so I used the “QA” tool to check for roads without names. I think I added about 70 missing names, much more then I had thought of. I also discovered that in the eastern part of Nyköping there was black areas where roads were missing. The areas had no aerial imagery. I went to sleep late that night, mapping about 30 new roads without aerial imagery. I think the result become as good as it can be anyway.

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