On Sun, Jun 26, 2011 at 10:45 AM, Mike N <[email protected]> wrote: > On 6/26/2011 10:01 AM, Nick Hocking wrote: > >> What would be really usefull is to have OSM in one of the geofabrik >> compare windows and TIGER 2010 in the other. Is there an easy way to >> achieve this? >> > > Until Ian gets the comparison server up, you can try setting the > "Inactive" layer color in JOSM to a bright color. Download an area of > interest. Open the .OSM file - it will come in as a new layer. Then > Activate the original "Data Layer 1". Now the original TIGER roads will > overlay the new TIGER data - partially obscuring it. New roads from a new > subdivision will stand out easily, as there will be no overlaying road. > Dave Hansen's original example illustrates this: > > http://daveh.dev.**openstreetmap.org/portland/**josm-ping.png<http://daveh.dev.openstreetmap.org/portland/josm-ping.png> > > From the .OSM layer, you can select new roads, then "Merge Selection" to > put them into the new working map layer. > > In my case, I also created a county-wide extract with Osmosis to be able > to do a massive overlay comparison without having to download it all by API.
Related to this, I've just made a wiki page to bring together all methods and implementations of comparing external datasets with OSM. Please take a look at it and add anything that might be missing: http://wiki.openstreetmap.org/wiki/Comparing_OSM_with_other_datasets I'd like to see a toolset developed to produce ITO-style analysis for any set of data, whether TIGER, state, or county data. -Josh
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