The Geospatial Web

The left screenshot shows an MODIS (Moderate Resolution Imaging Spectroradiometer) overlay of Hurricane Katrina as of August 29, 2005. The map in the center displays Sigalert.com, a service that aggregates real-time traffic data from the San Francisco Bay Area. The screenshot on the right exemplifies the idea of a mash-up, using the Sigalert traffic data to project symbols for accidents and current traffic speeds onto the Google Earth representation of Southern Los Angeles.

Source: Chapter 1, page 5.