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  Image: Geographic Location Direction Photo #: ISS044-E-885 Date: Jun. 2015
Geographic Region: AUSTRALIA-WA

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  Roebuck Bay, north coast of Western Australia

This detailed image taken by an astronaut aboard the International Space Station shows strikingly regular shoreline patterns at Roebuck Bay on the coast of the desert country of Western Australia. The indents along the shoreline (image center and left) are points where small straight streams reach the bay. Even smaller tributaries give a feathered appearance to this shoreline. By contrast, more typical meandering channel patterns of coastal wetlands appear top right. Almost no human-built patterns can be seen even though the town of Broome lies just outside the image top right. Fence lines cross the straight streams in the bottom third of the image.

Looking for an explanation of the regularity of the stream pattern, geologists searched more widely in the surrounding area. They found several inland dunefields that show the same straight pattern of parallel "linear dunes." Interestingly, the dunes are spaced generally the same distance apart as between the straight streams. Dunes and the straight streams are also all aligned with the dominant easterly wind. It seems likely that dunes produced by the same winds once occupied the bay shore, and even though they are not visible today, may have controlled the spacing and linearity on the straight streams. The phenomenon of streams forming in the parallel lows between the linear dunes is well known in desert landscapes.

This detailed image of Roebuck Bay shows fifteen km of coastline. The bay can be located on the lower left corner of the panoramic astronaut view ISS040-E-89959.

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Images: All Available Images Low-Resolution 106k
Mission: ISS044  
Roll - Frame: E - 885
Geographical Name: AUSTRALIA-WA  
Center Lat x Lon: 18S x 122.4E
Film Exposure:   N=Normal exposure, U=Under exposed, O=Over exposed, F=out of Focus
Percentage of Cloud Cover-CLDP: 10
Camera: N6
Camera Tilt: 44   LO=Low Oblique, HO=High Oblique, NV=Near Vertical
Camera Focal Length: 1150  
Nadir to Photo Center Direction: E   The direction from the nadir to the center point, N=North, S=South, E=East, W=West
Stereo?:   Y=Yes there is an adjacent picture of the same area, N=No there isn't
Orbit Number:  
Date: 20150611   YYYYMMDD
Time: 052049   GMT HHMMSS
Nadir Lat: 18.6S  
Latitude of suborbital point of spacecraft
Nadir Lon: 119.0E  
Longitude of suborbital point of spacecraft
Sun Azimuth: 335   Clockwise angle in degrees from north to the sun measured at the nadir point
Space Craft Altitude: 217   nautical miles
Sun Elevation: 44   Angle in degrees between the horizon and the sun, measured at the nadir point
Land Views: COAST, DESERT  
Water Views: BAY, CHANNEL  
Atmosphere Views:  
Man Made Views:  
City Views:  
Photo is not associated with any sequences

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