Geoscience Reference
In-Depth Information
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Terrain Profile
Radar
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Fig. 6. Vertical section of the terrain profile from the Palermo radar site to the Altofonte
gauge derived from the Digital Elevation Model shown in Fig. 5. The blue lines indicate the
boundaries of the radar antenna Half Power Beam Width.
The scope of our QPE analysis is twofold:
to evaluate from an hydrological point of view the radar ability in discriminating wet
versus dry hours;
to assess quantitatively the radar accuracy in estimating hourly rain rates.
As introduced in the methodological Section 4.1.2, the latter quantitative assessment will be
based on the Scatter in dB and thoroughly described in Sec. 4.2.2; the former evaluation will
be presented in the Sec. 4.2.1.
4.2.1 Wet versus dry hours discrimination according to radar echoes using the gauge
as reference
The history of applying contingency tables (also called error matrices in the remote sensing
field) for the verification of one set of observations against a reference set is a quite long one.
The history of categorical statistics based on such tables is rather fascinating and an
interesting account is given by Murphy (1996). Most of the scores were first derived nearly a
century ago and have been rediscovered several times (with different names in different
branches of science, see for instance the bullet list below).
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