The satellites of which one of the following countries have helped in the preparation of a detailed and complete map of Antarctica?

1. The preparation of a detailed and complete map of Antarctica, including features beneath the ice sheet, was significantly aided by radar satellites. 2. Canada's RADARSAT-1 satellite, launched in 1995, played a crucial role in the Antarctic Mapping Mission (AMM-1) during 1997, utilizing its Synthetic Aperture Radar (SAR) to penetrate cloud cover and darkness, enabling comprehensive mapping of the continent.