The video below is from last week's ChiHackNight session. Steve Vance describes Open Street Mapping and efforts to create better maps for areas of the world, like Puerto Rico, where there are not enough good maps to support disaster recovery efforts.
Here are some relevant links:
Open Street Map site - click here
Humanitarian Open Street Map team - click here
Many areas prone to disaster have not yet been mapped. View the video, visit the web sites and find ways you can help.