□
□ □
[□]
The current rate of sea-level rise is estimated to be about 1.5 to 2.0 mm / yr , with large contributions from the melting of mountain glaciers ( ~ 0.5 mm / yr ) and thermal expansion of the oceans . For example , a recent study using airborne SAR data collected over wetlands in Belize showed that a high degree of separability between the different vegetation communities could be achieved using a variety of indices based upon different radar frequencies and polarizations ( Pope et al ., 1994 ) . Once the first set of scaffold branches has been selected , select a second set above it , with the new scaffold branches beginning about 12 inches above the top branch of the first . Understanding the processes in the seasonal snow cover is also important for studies of the chemical balance of alpine drainage basins , because of translocation of anions and cations within the snow pack and possible concentrated release in the first phases of the melt season . Radarsat has the disadvantage that it does not incorporate a precise orbit-determination capability , so interferometric processing will be difficult at best .