A novel set of geometric verification test fields with application to distance measures

Autor(en)

Eric Gilleland, Gregor Skok, Barbara G. Brown, Barbara Casati, Manfred Dorninger, Marion P. Mittermaier, Nigel Roberts, Laurence J. Wilson

Abstrakt

As part of the second phase of the spatial forecast verification intercomparison project (ICP), dubbed the Mesoscale Verification Intercomparison in Complex Terrain (MesoVICT) project, a new set of idealized test fields is prepared. This paper describes these new fields and their rationale and uses them to analyze a number of summary measures associated with distance and geometric-based approaches. The results provide guidance about how they inform about performance under various scenarios. The new case comparisons are grouped into four categories: (i) pathological situations such as when a variable is zero valued at all grid points; (ii) circular events aimed at evaluating how different methods handle contrived situations, such as equal but opposite translations, the presence of multiple events of same/different size, boundary effects, and the influence of the positioning of events in the domain; (iii) elliptical events representing simplified scenarios that mimic commonly encountered weather phenomena in complex terrain; and (iv) cases aimed at analyzing how the verification methods handle small-scale scattered events, very large events with holes (e.g., a small portion of clear sky on a cloudy overcast day), and the presence of noise in one or both fields. Results show that all analyzed measures perform poorly in the pathological setting. They are either not able to provide a result at all or they instigate a special rule to prescribe a value resulting in erratic results. The analysis also showed that methods provide similar information in many situations, but that each has its positive properties along with certain unique limitations.

Organisation(en)

Institut für Meteorologie und Geophysik

Externe Organisation(en)

National Center for Atmospheric Research (NCAR), University of Ljubljana, Environment and Climate Change Canada, MetOffice

Journal

Monthly Weather Review

Band

148

Seiten

1653-1673

Anzahl der Seiten

21

ISSN

0027-0644

DOI

https://doi.org/10.1175/MWR-D-19-0256.1

Publikationsdatum

04-2020

Peer-reviewed

Ja

ÖFOS 2012

105206 Meteorologie

ASJC Scopus Sachgebiete

Atmospheric Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/a-novel-set-of-geometric-verification-test-fields-with-application-to-distance-measures(2c90c72c-455c-443c-94a9-dbe8a5f36453).html