The morphology of isolated barchan dunes on Mars and Earth may shed light the dynamic conditions that form them, their migration direction physical properties sediments composing them. Thusfar, dune fields have been largely manually analyzed from aerial satellite imagery, as automatic detection techniques are often not sufficiently accurate in outlining dunes. Here, we employ an instance segmen...

This paper concerns the study of ripples that occur on windward Barchan dunes from field Najaf governorate, Iraq. These consist mainly sand sediments with variable sizes, including medium, fine, and very fine sands. Quartz represents major light mineral in Dunes sand. The prevailing wind direction area is NW-SE. ripple crest series every pattern are oriented perpendicular to NW-SE direction, wh...

In the hinterlands of Taklimakan Desert, we monitored Barchan dune evolution with Huace X90 GNSS in RTK working mode to obtain 3D coordinates a millimeter precision. Using these coordinates, digital model was built and superimposed CASS 9.0 ArcGIS 10.0. Auto CAD 2010 used draw an arc three elements starting point, end point included angle fit corresponding characteristic trajectory curve eight ...