US: Analysis of high-resolution satellite imagery has helped researchers in noticing small thawing of permafrost (soil at or below the freezing point of water 0 °C for two or more years) in Alaska, US.
Permafrost thaw forms diversity of landscape. It is important for scientists to quantify these changes to be able to understand the landscape better. Earlier, researchers could only detect large and visually distinct thawing. Researchers at the University of Florida have now demonstrated that it is possible to detect small permafrost thaw with the help of satellite imagery. They used images from the IKONOS satellite with a resolution of around 3 m to analyse 10.4 square km of land.