Fast-ice Distribution in East Antarctica During 1997 and 1999 Determined Using RADARSAT Data

An image correlation technique has been applied to RADARSAT ScanSAR images from November in 1997, and November 1999, to create the first detailed maps of fast ice around East Antarctica (75E-170E). This method is based upon searching for, and distinguishing, correlated regions of the ice-covered ocean which remain stationary, in contrast to adjacent moving pack ice. Within the overlapping longitudinal range of ~86E-150.6E, the total fast-ice area is 141,450 km2 in 1997 and 152,216 km2 in 1999. Calibrated radar backscatter data are also used to determine the distribution of two fast-ice classes based on their surface roughness characteristics.The outer boundaries of the determined fast-ice area for November in 1997 and 1999 are contained in the data files for this record.This work has been allocated to ASAC project 3024.

本研究将图像相关技术应用于1997年11月及1999年11月获取的RADARSAT扫描合成孔径雷达（ScanSAR）图像，绘制了东南极洲（75°E-170°E）周边区域首套详细的固定冰（fast ice）分布图。该方法通过搜寻并区分冰覆盖海域中保持静止的相关区域，以此与周边移动的浮冰群形成明确区分。在约86°E-150.6°E的重叠经度区间内，1997年的固定冰总面积为141450平方千米，1999年则达152216平方千米。研究同时利用校准后的雷达后向散射数据，基于表面粗糙度特征划分两类固定冰并确定其空间分布。本数据集的数据文件中收录了1997年11月及1999年11月所确定的固定冰区域外边界。本研究隶属于ASAC项目3024。