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Astronaut Photography of Earth - Display Record
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IdentificationMission: ISS038 Roll: E Frame: 23651 Mission ID on the Film or image: ISS038
Country or Geographic Name: USA-SOUTH DAKOTA
Features: LAKE SHARPE, MISSOURI RIVER, AGRICULTURAL FIELDS, MEANDER BEND, SNOW
Center Point: Latitude: 44.2 Longitude: -99.6 (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: High Oblique
Camera Focal Length: 1000mm
Camera: N4: Nikon D3X
Film: 6048E : 6048 x 4032 pixel CMOS sensor, 35.9mm x 24.0mm, total pixels: 25.72 million, Nikon FX format.
Percentage of Cloud Cover: 10 (0-10)
GMT Date: 20131226 (YYYYMMDD) GMT Time: 192221 (HHMMSS)
Nadir Point Latitude: 42.8, Longitude: -105.4 (Negative numbers indicate south for latitude and west for longitude)
Nadir to Photo Center Direction: East
Sun Azimuth: 185 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 222 nautical miles (411 km)
Sun Elevation Angle: 24 (Angle in degrees between the horizon and the sun, measured at the nadir point)
CaptionsLake Sharpe near Lower Brule, South Dakota
The Missouri River rises in the Rocky Mountains of western Montana, and flows generally to the southeast for approximately 3,767 km (2,341 miles) to its confluence with the Mississippi River north of St. Louis, Missouri – making it the longest river in North America. The river does not follow a straight southeasterly course along this distance, but includes may meander bends such as illustrated in this astronaut photograph from the International Space Station. This particular bend is occupied by Lake Sharpe, an approximately 130 km (80 miles) long reservoir formed behind the Big Bend Dam on the Missouri River. The lake surface is frozen and covered with snow, presenting a uniform white appearance in the image.
As meander bends develop, they tend to assume a distinctive U-shape when viewed from above. Over time, the river channel can continue to cut into the ends of the “U”, eventually bringing them so close together that the river then cuts across the gap to achieve a shorter flow path, essentially short-circuiting or cutting off the meander bend. When this happens and the meander ceases to be part of the active river channel, it may become an oxbow lake. The distance across the narrow neck of land (image lower right) associated with this meander near Lower Brule, South Dakota is approximately 1 km (0.62 miles); however, as the river flow is controlled by the Big Bend Dam downstream, the natural process of meander cutoff has been significantly slowed.
The snow cover also highlights circular agricultural fields on the small peninsula within the meander bend. This type of field indicates center-pivot irrigation, where water is distributed from a central point radially outwards using sprinklers to cover the field area. Crops grown here include corn and soybeans according to data from the US Department of Agriculture.
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Recommended Citation: Earth Science and Remote Sensing Unit, NASA-Johnson Space Center. "The Gateway to Astronaut Photography of Earth." .