The code that powers Google Crisis Map is an open source project at http://stratomap.googlecode.com/. Mikel Maron of OpenStreetMap started work on adding the option to use OSM base tiles on these maps, instead of the default Google Maps tiles.
Mikel's work in progress is in a changeset available on the project site.
However, before this is ready to use, there is a little bit more to be done:
- There needs to be a copyright notice that meets the requirements specified at How to credit OpenStreetMap. StackOverflow has some example code for adding a copyright notice to a map. The copyright notice should appear when the OSM base tiles are being shown, but not when other base tiles are being shown.
- The OSM map type should appear only when the person editing the map has selected OSM as the base map type.
Alice starts at http://stratomap.appspot.com/crisismap/maps and creates a new map. She is making a map for a part of the world where OpenStreetMap has better data, so she wants to use the OSM base map instead of the default Google map. She clicks on the pencil next to the map title to edit the map properties. Next to "Default base map", she chooses "OpenStreetMap". She saves and publishes her map.
Bob opens Alice's published map in his browser. He sees the OSM base map and a tasteful, proper OSM copyright notice in the corner of the map.