We have had the same difficulty with trying to get navigation companies to release subsets of their road network data useful for research...

Cheers, Bob

*****
Dr. Robert S. Chen
Director, Center for International Earth Science Information Network
 (CIESIN), The Earth Institute, Columbia University
Manager, NASA Socioeconomic Data and Applications Center (SEDAC)
P.O. Box 1000, 61 Route 9W, Palisades, NY 10964 USA
tel. +1 845-365-8952; fax +1 845-365-8922
e-mail: bc...@ciesin.columbia.edu
CIESIN web site: http://www.ciesin.columbia.edu
SEDAC web site: http://sedac.ciesin.columbia.edu




The above is also a big challenge when trying to convince private companies to release data for secondary, serendipitous public good???for example, getting personal health/sensor device makers to release their collections of individual data without hurting their existing business models.


--
Puneet Kishor
Science and Data Policy, Creative Commons
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