According to NASA:
This spectacular “blue marble” image is the most detailed true-color image of
the entire Earth to date. Using a collection of satellite-based observations,
scientists and visualizers stitched together months of observations of the land
surface, oceans, sea ice, and clouds into a seamless, true-color mosaic of every
square kilometer (.386 square mile) of our planet.
Visit their Visible Earth page for more images!