Add some buildings with know start dates

Add source tags for Jotunheimen glacier segments

Add source tags for Gråfjellsbrea segments

Trace Nigardsbreen from 1964/2004/2010/2013/2019 images

Trace Gråfjellsbrea from 1962/2006/2013/2019 images

Trace two glaciers near Galdhøpiggen from 1981 and 2017 images

Fix missing end dates and wrong oneway direction

Add more detail to the downtown Oslo road network

Add residential road that changed names due to the 2020 municipality changes

Add industrial railways north east of Lillestrøm station

Update northernmost section of the Norway/Sweden border from official data, and move the Norway/Sweden/Finland meeting point to the correct location

Add Oslo city hall

Add part of Oslo coastline from 1881 map

Add approximate tracks for the Ekeberg tunnel, connecting it to the pre-2011 highways in downtown Oslo

Add replacement of Strømsveien by tunnels in 1990s

Update another section of the Norway/Sweden border in Nordland from official data

Add start_date to small section of railway

Improve another section of the Norway/Sweden border using official data

Improve more of the current border between Norway and Sweden using official data

Create relation for Jotunheimen 1980-2014