Antarctic ice velocity derived from ALOS PALSAR, Envisat ASAR, RADARSAT- 2 and ERS-1/2 satellite radar interferometry color coded on a logarithmic scale and over- laid on a MODIS mosaic of Antarctica with geographic names discussed in the text. Pixel spacing is 300 m. Projection is polar stereographic at 71oS secant plane. Thick black lines delineate major ice divides. Thin black lines outline subglacial lakes dis- cussed in the text. Thick black lines along the coast are interferometrically-derived ice sheet grounding lines.