50 m. Geomorphic attributes that are derivatives of DEMs, such as hillslope angle maps, require both high horizontal and vertical resolution. Airborne systems can provide the highest resolution DEMs, but spaceborne SAR provides greater data coverage, especially in some remote regions. A fault scarp 10-15 m high associated with the active strand of the Altyn Tagh fault can be clearly distinguished. Erosional scarps that are about 10 m high on a flood-plain margin are easily identified and measured.
Correlation is higher for L-band, especially on steep slopes.