http://www.giss.nasa.gov/tools/panoply/overlays/

Additional Overlays

Continents

Earth_MWDB1 outline: Outlines of Earth's continents.
Download CNO (435 kB zipped) or CNOB (973 kB) file.

Earth_MWDB1 mask: 1440720 black-and-white mask based on the Earth_MWDB1 outline.
Download GIF (21 kB).

Earth_MWDB2 outline: Outlines of Earth's continents.
Download CNO (288 kB zipped) or CNOB (599 kB) file.

Earth_MWDB4 outline: Outlines of Earth's continents.
Download CNO (45 kB zipped) file.

Earth_MWDB5 outline: Outlines of Earth's continents.
Download CNO (12 kB zipped) file.

Earth_10x8 outline: Outlines of Earth's continents approximated on a 108 grid.
Download CNO (2 kB zipped) file.

Earth_10x8 mask: 720360 black-and-white mask based on the Earth_10x8 outline.
Download GIF (3 kB).

Continents and Political Borders

Borders_MWDB3 outline: Outlines of Earth's continents and of national borders.
Download CNO (165 kB zipped).

USA_MWDB2 outline: Outlines of Earth's continents and of national and U.S. state borders.
Download CNO (455 kB zipped) or CNOB (1024 kB) file.

USA_MWDB3 outline: Outlines of Earth's continents and of national and U.S. state borders.
Download CNO (119 kB zipped) or CNOB (224 kB) file.

Paleo Continents

Paleo_Pliocene_3ma outline: Outlines of Earth's continents during the Pliocene approx. 3 Mya, based on data provided by L. Sohl.
Download CNO (54 kB zipped) file.

Paleo_Pliocene_3ma mask: 1440720 black-and-white mask based on the Paleo_Pliocene_3ma outline.
Download GIF (12 kB).

Paleo_Sturtian outline: Outlines of Earth's continents during the Sturtian glaciation approx. 750 Mya, based on data provided by L. Sohl.
Download CNO (3 kB zipped) file.

Paleo_Sturtian mask: 720360 black-and-white mask based on the Paleo_Sturtian outline.
Download GIF (3 kB).

Paleo_Varanger2 outline: Outlines of Earth's continents during the Varanger glaciation approx. 650 Mya, based on data provided by L. Sohl.
Download CNO (3 kB zipped) file.

Paleo_Varanger2 mask: 720360 black-and-white mask based on the Paleo_Varanger2 outline.
Download GIF (3 kB).

Mars

Mars_datum outline: Outline of the line of average elevation on Mars.
Download CNO (64 kB zipped) file.