1. The imagery is free of licensing fees
2. NASA requires that they be provided a credit as the owners of the imagery
Visible Earth Addendum
Beyond the NASA Terms, the Visible Earth team requests, but does not require:
1. The Visible Earth be provided a credit as the location that the imagery was found at
2. A URL be provided, either to the Visible Earth (http://visibleearth.nasa.gov/
) or to the page providing the link to the used image.