On Tuesday 15 October 2013, Tyrfing OSM wrote: > > I have recently used N50 from Kartverket as one of my sources for > manually editing the map, and I was one of the people Norman asked to > explain (OSM user name Tyrfing). > I'm not using the data set as source for an automatic/scripted > import, but as a source from which I manually extract data. I'm > selective on which objects to extract, and I have the local knowledge > needed to verify the data.
Hello Tyrfing, first of all i think it is great you are working on improving waterbody mapping in Norway since as you are certainly aware mapping of those is very patchy in Norway at the moment. And using the kartverket data is also most certainly a good idea. > [...] > > I don't consider this use of data from Kartverket as an import, but > as manual editing using an external source, comparable to using e.g. > Bing as a source. The main difference is that N50 as a source is more > accurate and faster to work with. >From a quick look at your recent edits it seems they are well made and the new data is mostly well merged with existing stuff. But it is unavoidable due to the sheer amount of data you add that there are mechanical decisions made in the process that would deserve being discussed. This is what makes your edits different from use of Bing imagery as source. I see for example most waterways are tagged as stream although many are obviously too large for that (waterway=stream in combination with width=2 for example already stretches the definition of stream and there are streams in your edits significantly larger). You also seem to tag all wetlands with wetland=bog but i am not sure if this is correct in all cases, especially with wetlands around a river. But i lack the local knowledge to tell if this is truely wrong in the individual case. Again something that would need to be discussed if such tag is applied generally to all wetlands and is not decided individually. Finally i saw there are various unconnected streams like http://www.openstreetmap.org/browse/way/240629790 http://www.openstreetmap.org/browse/way/240630383 that are obviously errors and deserve manual checking and fixing. At least they should be tagged with a fixme. Note a thorough import discussion could also help with your workflow - the lack of orientation in the waterways you fix by hand for example can probably mostly be corrected automatically for the whole data set based on the elevation data sets kartverket also made available. The wiki page http://wiki.openstreetmap.org/wiki/No:Kartverket_import seems to be a good start although it currently lacks the full documentation of the source data attributes that would be useful to discuss the best translation into OSM tags. Greetings, -- Christoph Hormann http://www.imagico.de/ _______________________________________________ Imports mailing list [email protected] https://lists.openstreetmap.org/listinfo/imports
