Sand and gravel quarries, GeoEye-1 satellite image. North is at top. This site is just south of Morrilton, Arkansas, USA, on the Arkansas River, which is at far right. Arkansas Highway 113 is at far left. A sand quarry (brown) is at upper left, with conveyors belts taking sand to processing facilities. River water used on this site is channelled to evaporation pools at lower left. A railway track leads from the site towards lower right. Image data obtained on 23 August 2009. The US-operated GeoEye-1 satellite was launched in September 2008, and orbits at a height of 680 kilometres. It is the world's highest resolution commercial Earth-imaging satellite.