>  As it turns out the first clause is (apparently) to facilitate
>  tracking of how the data is used and so that they can announce
>  updates, and the second is to ensure proper attribution. I've asked
>  them permission to quote their complete reply but that's basically it.

What about derived data? SRTM is used to generate hillshades and
contour lines for example. ASTER data would be good for that too. Do
they have some less strict terms about distributing such derived data
(like requiring only attribution), or is their policy for it the same?

Martin

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