Greetings! Welcome to the Defining The Antarctic Groundline Team. This year, we are performing work in support of a larger NASA IPY project to determine the Antarctic’s mass balance (i.e., the net gain or loss of ice from the Southern continent.) Our goal is to determine the ‘Grounding Line’ along a specific stretch of Antarctic coastline, using NASA supplied computer codes written in Interactive Data Language (IDL) 4th generation programming language, installed and run in the windows environment. IDL compiling and execution is transparent to the user. Just click on the file name of the desired process, as described in the instruction manual and the code will be executed. Enjoy!