Cartography and map-based mashups are often based on Google Maps/ Google Earth (all rights reserved) or Open StreetMap (ODbL/CC BY-SA), neither of which are compatible with publishing the results under CC BY (default license for open-access journals) or CC0.
Which resources exist that allow to create maps/ map tiles/ geoshapes/ mashups under CC0 or at least CC BY?
The main use cases I have in mind are mapping
* disease outbreaks, floods or other disasters
* scientific expeditions.
Since these may occur anywhere, it would be beneficial to be able to build an infrastructure using specific tools and services that can be applied to any location around the globe (perhaps also across historic times and geological ages), or even for other celestial objects.