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IdentificationMission: ISS009 Roll: E Frame: 19682 Mission ID on the Film or image: ISS009
Country or Geographic Name: VENEZUELA
Features: LAKE MARACAIBO, GLINT PLATTERNS
Center Point: Latitude: 10.0 Longitude: -71.0 (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: 10
Camera Focal Length: 180mm
Camera: E4: Kodak DCS760C Electronic Still Camera
Film: 3060E : 3060 x 2036 pixel CCD, RGBG array.
Percentage of Cloud Cover: 10 (0-10)
GMT Date: 20040823 (YYYYMMDD) GMT Time: 164921 (HHMMSS)
Nadir Point Latitude: 9.5, Longitude: -71.2 (Negative numbers indicate south for latitude and west for longitude)
Nadir to Photo Center Direction: North
Sun Azimuth: 343 (Clockwise angle in degrees from north to the sun measured at the nadir point)
Spacecraft Altitude: 191 nautical miles (354 km)
Sun Elevation Angle: 88 (Angle in degrees between the horizon and the sun, measured at the nadir point)
Orbit Number: 892
CaptionsLake Maracaibo Duck Weed:
Venezuela’s Lake Maracaibo presents a complicated surface to interpret. The area is the largest oil producing region in the western hemisphere. Oil platforms and other infrastructure supporting the oil industry can be seen in the lake and along the coast. Oil slicks (very bright streaks) are common. Heavy ship traffic produces linear ship wakes. The vivid green streaks and swirls are patches of duck weed growth that has thrived on the lake this summer. The duck weed problem is so extensive that the Venezuelan government launched a massive campaign to remove it.
This image was taken by astronauts aboard the International Space Station on August 23, 2004. Sunglint—sun light reflecting off the relatively smooth water surface—produces patterns that highlights water surface features and movements. Sunglint reflects brightly off oil slicks, ship wakes and water roughened variably by wind in this image. Rough surfaces like floating vegetation (duck weed) stand out against the smooth water.
An earlier view of the duckweed swirls in Lake Maracaibo was taken by the Moderate Resolution Imaging Spectroradiometer (MODIS).
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Recommended Citation: Earth Science and Remote Sensing Unit, NASA-Johnson Space Center. "The Gateway to Astronaut Photography of Earth." .