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 red, respectively.
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 blue filter.
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)
Full resolution versions of the color and anaglyph images are available from NASAs Planetary Photojournal.
For more information, visit:
the Shuttle Radar Topography Mission home page
and the Landsat 7 home page.