Introduction For many decades, the...

Introduction

For many decades, the USGS has been a leader in providing distantly sensed data to national and international scientific and management communities. Adopting new technology to achieve its historical topographic mapping mission, the USGS has archived and distributed aerial photographs of the United States for more than half a hundred Since 1972, the USGS has been acquiring, archiving, and processing Landsat and other satellite and airborne distantly sensed data products and distributing them to users worldwide. Today, the USGS operates and manages the Landsat 5 and Landsat 7 satellite missions. It cooperates with the National Aeronautics and Space Administration