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A displacement and amplitude score employing an optical flow technique

Keil, Christian und Craig, George (2009) A displacement and amplitude score employing an optical flow technique. Weather and Forecasting, 24, Seiten 1297-1308. DOI: 10.1175/2009WAF2222247.1.

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Offizielle URL: http://journals.ametsoc.org/doi/pdf/10.1175/2009WAF2222247.1

Kurzfassung

A field verification measure for precipitation forecasts is presented that combines distance and amplitude errors. It is based on an optical flow algorithm that defines a vector field that deforms, or morphs, one image to match another. When the forecast field is morphed to match the observation field, then for any point in the observation field, the magnitude of the displacement vector gives the distance to the corresponding forecast object (if any), while the difference between the observation and the morphed forecast is the amplitude error. Similarly, morphing the observation field onto the forecast field gives displacement and amplitude errors for forecast features. If observed and forecast features are separated by more than a prescribed maximum search distance, they are not matched to each other, but they are considered to be two separate amplitude errors: a missed event and a false alarm. The displacement and amplitude error components are combined to produce a displacement and amplitude score (DAS). The two components are weighted according to the principle that a displacement error equal to the maximum search distance is equivalent to the amplitude error that would be obtained by a forecast and an observed feature that are too far apart to be matched. The new score, DAS, is applied to the idealized and observed test cases of the Spatial Verification Methods Intercomparison Project (ICP) and is found to accurately measure displacement errors and quantify combined displacement and amplitude errors reasonably well, although with some limitations due to the inability of the image matcher to perfectly match complex fields.

Dokumentart:Zeitschriftenbeitrag
Titel:A displacement and amplitude score employing an optical flow technique
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Keil, ChristianNICHT SPEZIFIZIERT
Craig, GeorgeNICHT SPEZIFIZIERT
Datum:2009
Erschienen in:Weather and Forecasting
Referierte Publikation:Ja
In SCOPUS:Ja
In ISI Web of Science:Ja
Band:24
DOI :10.1175/2009WAF2222247.1
Seitenbereich:Seiten 1297-1308
Status:veröffentlicht
Stichwörter:Algorithms, Forecast verification, Precipitation, Satellite observations
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt
DLR - Teilgebiet (Projekt, Vorhaben):L - Luftverkehr und Wetter (alt)
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Wolkenphysik und Verkehrsmeteorologie
Hinterlegt von: Jana Freund
Hinterlegt am:15 Jan 2009
Letzte Änderung:12 Dez 2013 20:36

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