IMPROVED ANTARCTIC ROCK POLYGONS DERIVED FROM LANDSAT IMAGE MOSAIC OF ANTARCTICA

The Scientific Committee on Antarctic Research has maintained the Antarctic Digital Database (ADD) as a consistent geographic framework for the international polar community. Data layers in the ADD are compiled from various sources up to 60 years old. ADD is used to inform and execute scientific and logistic operations across the continent. In 2008 the creation of the 15-meter Landsat Image Mosaic of Antarctica (LIMA) delivered the first ever high-resolution, cloud-free image of Antarctica to Landsat’s maximum nadir latitude of 82.6 degrees south. Using the LIMA color mosaic as a single continuous data source, rock outcrop extent polygons have been created using supervised classification to provide an enhanced geospatial understanding for the amount of exposed rock in Antarctica. The new rock outcrop polygons clarify the total area of exposed geology across the continent closer to 0.25% and detailed accuracy assessment using commercial satellite imagery proves higher precision than the current internationally recognized data layer included in the ADD. Improved understanding for the amount of exposed geology will help inform the polar community and assist in better practices for preserving delicate Antarctic ecosystems and pristine geologic environment.