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This view of northern Patagonia, at Los Menucos, Argentina shows
remnants of relatively young volcanoes built upon an eroded plain of
much older and contorted volcanic, granitic, and sedimentary rocks. The
large, dark 'butterfly' pattern is a single volcano that has been deeply
eroded. Large holes on the volcano's flanks indicate that they may have
collapsed soon after eruption, as fluid molten rock drained out from
under its cooled and solidified outer shell.
The color image (top) is derived from Landsat 7 data. Bands 1 (blue), 4
(near infrared), and 7 (shortwave infrared) are shown in blue, green and
The anaglyph (bottom) was generated by first draping a Landsat 7
Enhanced Thematic Mapper + image over a topographic map from the Shuttle Radar Topography Mission,
then producing the two differing perspectives, one for each eye. When
viewed through special glasses, the result is a vertically exaggerated
view of the Earth's surface in its full three dimensions. Anaglyph
glasses cover the left eye with a red filter and the right eye with a
Landsat satellites have provided visible light and infrared images of
the Earth continuously since 1972. SRTM topographic data match the
30-meter (99-foot) spatial resolution of most Landsat images and provide
a valuable complement for studying the historic and growing Landsat data
archive. The Landsat 7 Thematic Mapper image used here was provided to
the SRTM project by the United States Geological Survey, Earth Resources
Observation Systems (EROS) Data Center, Sioux Falls, South Dakota.
Location: 41 deg. South lat., 69 deg. West lon.
Orientation: North toward upper left
Image Data: Landsat 7 ETM+ band 4
Date Acquired: February 19, 2000 (SRTM), January 22, 2000 (Landsat)