Homeland
Security
The events of September 11 heightened the need for updated mapping and imagery
of 120 of the Nation's cities (90 metropolitan areas) identified as potential
targets for terrorist attacks. These cities are home to more than 180 million
Americans. Through The National Map, USGS efforts are focused on developing
detailed, up-to-date basic geographic information for these cities. In partnership
with the National Imagery and Mapping Agency, the USGS is working with State,
regional, and local agencies to provide updated imagery and mapping information
needed to prepare for and respond to terrorist attacks.
The USGS is working with first responders to identify critical map information that they need to respond effectively. Their needs include the following:
- Current, high-resolution map data and information, including true color imagery
- Additional information about critical infrastructure, such as power and water utilities
- Identification of places that could close access or evacuation routes
- Information linked to mapped features, such as details about the capabilities of hospitals
- Availability of information through the World Wide Web in a form that can be used for computer analysis and mapping
Responding to these needs, current efforts to assemble The National Map are concentrating on the acquisition of very detailed color imagery and complementary detailed elevation data to provide the layout of the cities. Future efforts will add delineations of transportation networks, hydrography, geographic names, structures, boundaries of jurisdictions, and other aspects of infrastructure critical to the cities.