Results of airborne radio echo-sounding (RES) i n Antarctica are presented. F l i g h t tracks covering 50% of the Antarctic 1ce sheet on a 50 to 100 km square g r i d , flown using I n e r t i a ! navigation, have errors « 5 km. Ice thicknesses determined from 35, 60, and 300 MHz RES records are accurate to 10 m or 1.5% thickness (whichever i s g r e a t e r). A l t i m e t r y , determining surface and sub-surface elevations, a f t e r corrections have errors <<50 m. An up-to-date coast-l i n e compiled from s a t e l l i t e imagery and a l l recent sources has frequencies f o r various coastal types of: 1ce shelves (44%), ice streams/outlet glaciers (132), Ice walls (38%), and rocks (5%). A new map of the Ice sheet surface has been compiled from 101 000 RES data points, 5 000 Tropical Wind, Energy conversion and Reference Level Experiment (TWERLE) balloon altimetry points, geodetic s a t e l l i t e and selected traverse elevations. The volume of the Antarctic ice sheet Including 1ce shelves has been calculated p r i n c i p a l l y from RES data using various techniques as 30.11±2.5 x 10 6 km 3. Frequency d i s t r i b u t i o n s for subgladal bedrock elevations f o r East and West Antarctica are presented. They conform approximately to Gaussian (normal) functions.
Results of airborne radio echo-sounding (RES) i n Antarctica are presented. F l i g h t tracks covering 50% of the Antarctic 1ce sheet on a 50 to 100 km square g r i d , flown using I n e r t i a ! navigation, have errors « 5 km. Ice thicknesses determined from 35, 60, and 300 MHz RES records are accurate to 10 m or 1.5% thickness (whichever i s g r e a t e r ) . A l t i m e t r y , determining surface and sub-surface elevations, a f t e r corrections have errors <<50 m. An up-to-date coastl i n e compiled from s a t e l l i t e imagery and a l l recent sources has frequencies f o r various coastal types of: 1ce shelves (44%), ice streams/outlet glaciers (132), Ice walls (38%), and rocks (5%). A new map of the Ice sheet surface has been compiled from 101 000 RES data points, 5 000 Tropical Wind, Energy conversion and Reference Level Experiment (TWERLE) balloon altimetry points, geodetic s a t e l l i t e and selected traverse elevations.
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