The distribution of backscatter coefficient ( σ0) values extracted for
the training samples representing the different grassland classes are
displayed in Fig. 3. The boxes represent the inter-quartile range and
the whiskers extend to within 1.5 times the inter-quartile range from
the upper and lower quartiles. The C-band VV polarisation signatures
display similar dynamic ranges for acquisitions in both counties
(Fig. 3(a) & (b)), though the overall variation in the distribution of σ0
values for each class is higher for the Sligo acquisitions. The difference
between median σ0 values varies between classes for all acquisition
dates. In general, the GSdh and GSdc classes display the greatest separability for the Longford dataset, with GSdh σ0 values on average 3 dB