I've done the same as Craig: exported only the features I was interested in using QGIS, before using JOSM to tidy it up.<div><br></div><div>I did Chew Valley Lake and the River Chew running into it from the Avon at Keynsham. <a href="http://www.openstreetmap.org/?lat=51.3356781005859&lon=-2.61131286621094&zoom=13">http://www.openstreetmap.org/?lat=51.3356781005859&lon=-2.61131286621094&zoom=13</a></div>
<div><br></div><div>The entire process took a long, long time (we're talking many hours), as the OS data is all fragmented and needs joining up.</div><div><br></div><div>(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...)</div>
<div><br></div><div>Tim<br><br><div class="gmail_quote">On Sun, Dec 11, 2011 at 6:28 PM, Craig Loftus <span dir="ltr"><<a href="mailto:craigloftus%2Bosm@googlemail.com">craigloftus+osm@googlemail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">> Have any large scale imports from this dataset already been done?<br>
<br>
Unfortunately some have. Orkney is particularly bad.<br>
<br>
> Do people think this is a good idea? Any suggestions regarding the process?<br>
<br>
I don't think area based importing is useful. Too many fragmented<br>
waterways, and non-existent drains get pulled in. The few imports I've<br>
done have focused on specific features, e.g., the banks and<br>
tributaries of a river in an area I was mapping. It takes a long time<br>
to get the sections connected together, the islands added, and all the<br>
waterways connected; without focusing on a specific feature it would<br>
be far too easy to overlook bits that needed tidying up.<br>
<br>
In terms of the process, I found it useful to select and export just<br>
the features I wanted in QGIS before extracting to OSM. And then to<br>
use the JOSM validator to quickly eliminate the hundreds of duplicate<br>
and unconnected nodes that seem to be created. Using exallpoly.py with<br>
riverbanks tends to result in problems and I ended up modifying it to<br>
not close the areas.<br>
<br>
Craig<br>
<br>
On 11 December 2011 11:26, Borbus <<a href="mailto:borbus@gmail.com">borbus@gmail.com</a>> wrote:<br>
> First of all, when I say import I mean a manual import: reprojection of<br>
> OS shapefiles, conversion to OSM data and careful processing in JOSM<br>
> before uploading.<br>
><br>
> I'd really like to get all the water features from OS into OSM. It's<br>
> very useful data and also makes maps prettier. It's quite a laborious<br>
> task, though, as the data requires manual creation of multipolygons and<br>
> of course merging with any water features we already have.<br>
><br>
> I have already done a small amount here:<br>
> <a href="http://www.openstreetmap.org/?lat=52.6006&lon=1.6362&zoom=13&layers=M" target="_blank">http://www.openstreetmap.org/?lat=52.6006&lon=1.6362&zoom=13&layers=M</a><br>
> Although I have not joined together all gaps, just some gaps where a way<br>
> crosses it and it is obviously a conduit.<br>
><br>
> Now I have split the Vectormap square TG into smaller chunks which I<br>
> plan to process one by one and upload. The amount of data in just this<br>
> square is quite large, but it's still probably less than half of Norfolk.<br>
><br>
> Have any large scale imports from this dataset already been done?<br>
><br>
> Do people think this is a good idea? Any suggestions regarding the process?<br>
><br>
> Happy mapping,<br>
><br>
> Borbus.<br>
><br>
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</blockquote></div><br></div>