arctic tundra is an unglaciated, treeless landscape characterized by the presence of continuous permafrost. The tundra is vegetated by low vegetation such as grass and sedges, herbs, little bushes, lichens [...] opportunity to receive information about the state of the tundra in large areas near real time. Permafrost in Greenland Geocoded TerraSAR-X scene of Zackenberg valley (© DLR 2013) (Photo: Alfred Wegener