[OSM-talk] Visually detect missing roads

[Mateusz Konieczny]

It would be useful to allow switching between diff, OSM only and google
only. Currently in my area results are too confusing to be useful.

2014-09-09 9:11 GMT+02:00 Stephan Knauss <osm at stephans-server.de>:

> I did announce this on the German list last week. As the load did not
> cause the server to catch fire I'm now announcing it to a wider audience.
>
> I have created a map which visually diffs our data against Google Maps.
> Currently it compares major highways (unclassified and higher) and water
> features.
>
> The data is styled to show up in bright colors. If there is "matching"
> data in OSM it would hide the Google data.
>
> So in a "perfect" area the map would be grey. Differences stay visible.
>
> You can try it here: http://compare.osm-tools.org/
>
> It has the possibility to directly load the visible area into the editors.
>
> More details can be found here: http://www.osm-tools.org/compare.html
>
> or if you're able to read German in my blog post at
> http://www.technologyblog.de/2014/08/wo-fehlen-bei-
> openstreetmap-noch-daten/
>
> In well-mapped areas the differences are usually caused by OSM data not
> being tagged as a major highway. If you're looking for areas where roads
> are actually missing and can be drawn from aerials head over to Asia.
>
> Hope this helps all people interested in arm-chair mapping to focus on the
> major missing parts of OSM-data.
>
> If you pan the map fast you'll see the original Google data. This is
> caused by the way technical way the images are layered. When using Google
> API instead of OpenLayers it would not do this but caching of tiles is
> worse with Google. That's why I decided to use OL.
>
> Enjoy mapping!
>
> Stephan
>
>
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