I've done the same as Craig: exported only the features I was interested in using QGIS, before using JOSM to tidy it up.
I did Chew Valley Lake and the River Chew running into it from the Avon at Keynsham. http://www.openstreetmap.org/?lat=51.3356781005859&lon=-2.61131286621094&zoom=13 The entire process took a long, long time (we're talking many hours), as the OS data is all fragmented and needs joining up. (Thinking about it I think I also did the Avon from Keynsham, through Bath and out the other side. I had a lot of spare time back then...) Tim On Sun, Dec 11, 2011 at 6:28 PM, Craig Loftus < [email protected]> wrote: > > Have any large scale imports from this dataset already been done? > > Unfortunately some have. Orkney is particularly bad. > > > Do people think this is a good idea? Any suggestions regarding the > process? > > I don't think area based importing is useful. Too many fragmented > waterways, and non-existent drains get pulled in. The few imports I've > done have focused on specific features, e.g., the banks and > tributaries of a river in an area I was mapping. It takes a long time > to get the sections connected together, the islands added, and all the > waterways connected; without focusing on a specific feature it would > be far too easy to overlook bits that needed tidying up. > > In terms of the process, I found it useful to select and export just > the features I wanted in QGIS before extracting to OSM. And then to > use the JOSM validator to quickly eliminate the hundreds of duplicate > and unconnected nodes that seem to be created. Using exallpoly.py with > riverbanks tends to result in problems and I ended up modifying it to > not close the areas. > > Craig > > On 11 December 2011 11:26, Borbus <[email protected]> wrote: > > First of all, when I say import I mean a manual import: reprojection of > > OS shapefiles, conversion to OSM data and careful processing in JOSM > > before uploading. > > > > I'd really like to get all the water features from OS into OSM. It's > > very useful data and also makes maps prettier. It's quite a laborious > > task, though, as the data requires manual creation of multipolygons and > > of course merging with any water features we already have. > > > > I have already done a small amount here: > > http://www.openstreetmap.org/?lat=52.6006&lon=1.6362&zoom=13&layers=M > > Although I have not joined together all gaps, just some gaps where a way > > crosses it and it is obviously a conduit. > > > > Now I have split the Vectormap square TG into smaller chunks which I > > plan to process one by one and upload. The amount of data in just this > > square is quite large, but it's still probably less than half of Norfolk. > > > > Have any large scale imports from this dataset already been done? > > > > Do people think this is a good idea? Any suggestions regarding the > process? > > > > Happy mapping, > > > > Borbus. > > > > _______________________________________________ > > Talk-GB mailing list > > [email protected] > > http://lists.openstreetmap.org/listinfo/talk-gb > > _______________________________________________ > Talk-GB mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk-gb >
_______________________________________________ Talk-GB mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk-gb
