All data is reduced to bytes for storage and processing purposes.
We used amplitude (square-root of intensity) instead of
intensity because: 1) the histogram conserves a larger dynamic
range of bytes for medium backscatter targets, such as forest,
which are the most interesting targets in out thematic context;
and 2) intensity enhances high backscatter targets (e.g. urban
areas and floods), while a logarithm representation enhances
low backscatter targets (e.g. calm waters and savannas).