The purpose of the NSDI is to provide accurate and reliabledata for decisions that enhance Americans' health, safety and welfare, security, and prosperity. Public- and private-sector decision-makers are realizing the challenges of implementing effective actions. Complex, dynamic, long-term policy areas — such as global warming, the aftermath of the housing bubble, and preparing for and responding to natural disasters — require better and more accessibledata, new analytic tools, and new ways of collaborating among disparate stakeholders. The NSDI will provide powerful capabilities that use digital map information to connect vast amounts of data by geographic location. It will help decision-makers visualize and understand complex situations. A complete NSDI will allow disparate information to be combined, analyzed, and displayed in space and time to show patterns that are often critical to wise decision-making.