I have been getting involved recently with the Humanitarian OpenStreetMap initiative. It is a great group that collects data and information and puts it to use to help communities during a disaster and to prepare and recover as well. I sing thig groups praises.
Also, I recommend learning more about how to map on the OpenStreetMap software. It is fully community and local driven with people in those communities doing a lot of the coordination and collection. Keep in mind OpenStreetMap is a worldwide community. They have folks in so many countries around the world and projects from many places that really need the help.