How to Compare Maps

ocarta map comparisonIn my last post I referred to an article that compares various online mapping servers.

Now you can see the effect for your self. ocarto allows you to overlay 7 layers of maps from Google, Yahoo, MS Virtual Earth, and Terraserver.

Search for: 44.300572,-78.339096 in ocarto, and zoom in all the way. It's the town of Peterborough, Ontario, Canada.

You can search for the nearby town of Royal Oak, MI to see a lot of new development, roads that don't exist on many maps, existing on Google. (I'll send them a cookie)

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About the Author

Andrew Turner is an advocate of open standards and open data. He is actively involved in many organizations developing and supporting open standards, including OpenStreetMap, Open Geospatial Consortium, Open Web Foundation, OSGeo, and the World Wide Web Consortium. He co-founded CrisisCommons, a community of volunteers that, in coordination with government agencies and disaster response groups, build technology tools to help people in need during and after a crisis such as an earthquake, tsunami, tornado, hurricane, flood, or wildfire.