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The Gateway to Astronaut Photography of Earth
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Astronaut Photography of Earth - Display Record
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IdentificationMission: ISS032 Roll: E Frame: 10487 Mission ID on the Film or image: ISS032
Country or Geographic Name: USA-NEVADA
Features: WALKER LAKE, HAWTHORNE, AGRICULTURAL FIELDS, MOUNT GRANT
Center Point Latitude: 38.7 Center Point Longitude: -118.8 (Negative numbers indicate south for latitude and west for longitude)
Stereo: (Yes indicates there is an adjacent picture of the same area)
ONC Map ID: JNC Map ID:
CameraCamera Tilt: 23
Camera Focal Length: 180mm
Camera: N2: Nikon D2Xs
Film: 4288E : 4288 x 2848 pixel CMOS sensor, RGBG imager color filter.
Percentage of Cloud Cover: 10 (0-10)
NadirGMT Date: 20120729 (YYYYMMDD) GMT Time: 143903 (HHMMSS)
Nadir Point Latitude: 40.2, Longitude: -118.7 (Negative numbers indicate south for latitude and west for longitude)
Nadir to Photo Center Direction: South
Sun Azimuth: 81 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 215 nautical miles (398 km)
Sun Elevation Angle: 19 (Angle in degrees between the horizon and the sun, measured at the nadir point)
CaptionsWalker Lake, Nevada
Note: This caption refers to the image versions labeled "NASA's Earth Observatory web site".
The Pleistocene landscape of western Nevada approximately 15,000 years ago was one of narrow mountain ranges and numerous interconnected lakes that together formed the extensive glacial Lake Lahontan. Drying and warming of the regional climate since the last Ice Age led to the disappearance of the glaciers feeding meltwater to Lake Lahontan, and eventual disappearance of the lake itself. Today, few remnants of Lahontan remain; most of its arms have become dry enclosed basins known as playas.
This astronaut photograph highlights Walker Lake, one of only two remnant lakes that contain water throughout the year (Pyramid Lake in Nevada is the other). Walker Lake is located in an enclosed basin bounded by the Wassuk Range to the west and the Gillis Range to the east. The lake is fed by the Walker River flowing from the north. The current dimensions of the lake are approximately 21 kilometers north-south by 9 km east-west. Shoreline deposits at higher elevations than the current lake level form concentric bands that are just visible in the image (top center) – these record varying lake levels in the geologic past.
The nearest town to Walker Lake is Hawthorne, Nevada to the southeast. To the southwest the highest peak of the Wassuk Range, Mount Grant (elevation 3496 meters above sea level), dominates the skyline. Green agricultural fields, primarily alfalfa, located to the west of the Wassuk Range (image upper left) provide a striking contrast to the surrounding Great Basin desert. These fields are irrigated using water from the nearby East Fork of the Walker River (image left, just visible alongside the fields).
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