Spatial forecast verification: Image warping

PREFACE : In response to a growing need for more informative forecast verification in the face of gridded verification sets, many new methods have been proposed. While widely varying in their approaches, the new methods generally fall into two major categories of filter and displacement, each of which can be further subdivided. One of the displacement approaches, a field deformation approach known as image warping, will be demonstrated here. Results for spatial verification of the spatial forecast verification Inter-Comparison Project test cases are shown. An initial look at space-time verification using the image warp is also discussed, with an application to NCAR and NCEP 4-km WRF models cases from the 2005 NSSL/SPC Spring Program. The approach is found to be very useful for obtaining guidance about forecast performance. Both diagnostic and summary score information can be gleaned. Initial findings for the space-time approach show that while the NCEP model has better initial scores, the NCAR models require drastically less deformation to achieve a much higher reduction in error. This is most likely a result of the NCEP model's highly over forecasting low-intensity precipitation spatially.

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Author Gilleland, Eric
Chen, Linchao
DePersio, Michael
Do, Giang
Eilertson, Kirsten
Jin, Yin
Lang, Emily
Lindgren, Finn
Lindström, Johan
Smith, Richard
Xia, Changming
Publisher UCAR/NCAR - Library
Publication Date 2010-10-26T00:00:00
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Topic Category geoscientificInformation
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Metadata Date 2023-08-18T18:06:20.598964
Metadata Record Identifier edu.ucar.opensky::technotes:495
Metadata Language eng; USA
Suggested Citation Gilleland, Eric, Chen, Linchao, DePersio, Michael, Do, Giang, Eilertson, Kirsten, Jin, Yin, Lang, Emily, Lindgren, Finn, Lindström, Johan, Smith, Richard, Xia, Changming. (2010). Spatial forecast verification: Image warping. UCAR/NCAR - Library. Accessed 30 September 2023.

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