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Improvements to MISR stereo motion vectors
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| Zeitschriftentitel: | Journal of Geophysical Research: Atmospheres |
|---|---|
| Personen und Körperschaften: | |
| In: | Journal of Geophysical Research: Atmospheres, 118, 2013, 11, S. 5600-5620 |
| Format: | E-Article |
| Sprache: | Englisch |
| veröffentlicht: |
American Geophysical Union (AGU)
|
| Schlagwörter: |
| author_facet |
Horváth, Ákos Horváth, Ákos |
|---|---|
| author |
Horváth, Ákos |
| spellingShingle |
Horváth, Ákos Journal of Geophysical Research: Atmospheres Improvements to MISR stereo motion vectors Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics |
| author_sort |
horváth, ákos |
| spelling |
Horváth, Ákos 2169-897X 2169-8996 American Geophysical Union (AGU) Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics http://dx.doi.org/10.1002/jgrd.50466 <jats:p>This study evaluated the effects of recent major modifications to the Multiangle Imaging SpectroRadiometer (MISR) wind retrieval algorithm by repeating an earlier yearlong comparison with Meteosat‐9 cloud motion vectors. Algorithm upgrades included an area‐based stereo matcher, enhanced quality control, georegistration corrections to focal plane distortions, and increased retrieval resolution. The new winds had better quality at all levels, yielding a particularly large increase in coverage at middle and high levels. The upgrades had an overall neutral impact on the E‐W wind comparison statistics, which were already quite good in the preceding MISR data set. The comparison statistics for the more error‐prone N‐S wind, however, improved significantly on all scales—global, zonal, and regional—and throughout the entire atmosphere. Both the negative N‐S wind bias and root mean square difference decreased, and correlation increased substantially, with middle and high levels, and tropics and subtropics experiencing the largest improvements. Subpixel georegistration corrections reduced cross‐swath variations in N‐S wind and height by half. As the net effect of these improvements, the error characteristics of the previously more uncertain N‐S wind component became comparable to those of the E‐W wind component at low and middle levels. Despite the substantial reductions in N‐S wind errors, which are highly correlated with stereo height errors, the MISR – Meteosat‐9 height comparison did not generally improve, strongly suggesting Meteosat‐9 height assignment errors as the primary driver of discrepancy.</jats:p> Improvements to MISR stereo motion vectors Journal of Geophysical Research: Atmospheres |
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10.1002/jgrd.50466 |
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Journal of Geophysical Research: Atmospheres |
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| title |
Improvements to MISR stereo motion vectors |
| title_unstemmed |
Improvements to MISR stereo motion vectors |
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Improvements to MISR stereo motion vectors |
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Improvements to MISR stereo motion vectors |
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Improvements to MISR stereo motion vectors |
| title_short |
Improvements to MISR stereo motion vectors |
| title_sort |
improvements to misr stereo motion vectors |
| topic |
Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics |
| url |
http://dx.doi.org/10.1002/jgrd.50466 |
| publishDate |
2013 |
| physical |
5600-5620 |
| description |
<jats:p>This study evaluated the effects of recent major modifications to the Multiangle Imaging SpectroRadiometer (MISR) wind retrieval algorithm by repeating an earlier yearlong comparison with Meteosat‐9 cloud motion vectors. Algorithm upgrades included an area‐based stereo matcher, enhanced quality control, georegistration corrections to focal plane distortions, and increased retrieval resolution. The new winds had better quality at all levels, yielding a particularly large increase in coverage at middle and high levels. The upgrades had an overall neutral impact on the E‐W wind comparison statistics, which were already quite good in the preceding MISR data set. The comparison statistics for the more error‐prone N‐S wind, however, improved significantly on all scales—global, zonal, and regional—and throughout the entire atmosphere. Both the negative N‐S wind bias and root mean square difference decreased, and correlation increased substantially, with middle and high levels, and tropics and subtropics experiencing the largest improvements. Subpixel georegistration corrections reduced cross‐swath variations in N‐S wind and height by half. As the net effect of these improvements, the error characteristics of the previously more uncertain N‐S wind component became comparable to those of the E‐W wind component at low and middle levels. Despite the substantial reductions in N‐S wind errors, which are highly correlated with stereo height errors, the MISR – Meteosat‐9 height comparison did not generally improve, strongly suggesting Meteosat‐9 height assignment errors as the primary driver of discrepancy.</jats:p> |
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| author | Horváth, Ákos |
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| description | <jats:p>This study evaluated the effects of recent major modifications to the Multiangle Imaging SpectroRadiometer (MISR) wind retrieval algorithm by repeating an earlier yearlong comparison with Meteosat‐9 cloud motion vectors. Algorithm upgrades included an area‐based stereo matcher, enhanced quality control, georegistration corrections to focal plane distortions, and increased retrieval resolution. The new winds had better quality at all levels, yielding a particularly large increase in coverage at middle and high levels. The upgrades had an overall neutral impact on the E‐W wind comparison statistics, which were already quite good in the preceding MISR data set. The comparison statistics for the more error‐prone N‐S wind, however, improved significantly on all scales—global, zonal, and regional—and throughout the entire atmosphere. Both the negative N‐S wind bias and root mean square difference decreased, and correlation increased substantially, with middle and high levels, and tropics and subtropics experiencing the largest improvements. Subpixel georegistration corrections reduced cross‐swath variations in N‐S wind and height by half. As the net effect of these improvements, the error characteristics of the previously more uncertain N‐S wind component became comparable to those of the E‐W wind component at low and middle levels. Despite the substantial reductions in N‐S wind errors, which are highly correlated with stereo height errors, the MISR – Meteosat‐9 height comparison did not generally improve, strongly suggesting Meteosat‐9 height assignment errors as the primary driver of discrepancy.</jats:p> |
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| spelling | Horváth, Ákos 2169-897X 2169-8996 American Geophysical Union (AGU) Space and Planetary Science Earth and Planetary Sciences (miscellaneous) Atmospheric Science Geophysics http://dx.doi.org/10.1002/jgrd.50466 <jats:p>This study evaluated the effects of recent major modifications to the Multiangle Imaging SpectroRadiometer (MISR) wind retrieval algorithm by repeating an earlier yearlong comparison with Meteosat‐9 cloud motion vectors. Algorithm upgrades included an area‐based stereo matcher, enhanced quality control, georegistration corrections to focal plane distortions, and increased retrieval resolution. The new winds had better quality at all levels, yielding a particularly large increase in coverage at middle and high levels. The upgrades had an overall neutral impact on the E‐W wind comparison statistics, which were already quite good in the preceding MISR data set. The comparison statistics for the more error‐prone N‐S wind, however, improved significantly on all scales—global, zonal, and regional—and throughout the entire atmosphere. Both the negative N‐S wind bias and root mean square difference decreased, and correlation increased substantially, with middle and high levels, and tropics and subtropics experiencing the largest improvements. Subpixel georegistration corrections reduced cross‐swath variations in N‐S wind and height by half. As the net effect of these improvements, the error characteristics of the previously more uncertain N‐S wind component became comparable to those of the E‐W wind component at low and middle levels. Despite the substantial reductions in N‐S wind errors, which are highly correlated with stereo height errors, the MISR – Meteosat‐9 height comparison did not generally improve, strongly suggesting Meteosat‐9 height assignment errors as the primary driver of discrepancy.</jats:p> Improvements to MISR stereo motion vectors Journal of Geophysical Research: Atmospheres |
| spellingShingle | Horváth, Ákos, Journal of Geophysical Research: Atmospheres, Improvements to MISR stereo motion vectors, Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geophysics |
| title | Improvements to MISR stereo motion vectors |
| title_full | Improvements to MISR stereo motion vectors |
| title_fullStr | Improvements to MISR stereo motion vectors |
| title_full_unstemmed | Improvements to MISR stereo motion vectors |
| title_short | Improvements to MISR stereo motion vectors |
| title_sort | improvements to misr stereo motion vectors |
| title_unstemmed | Improvements to MISR stereo motion vectors |
| topic | Space and Planetary Science, Earth and Planetary Sciences (miscellaneous), Atmospheric Science, Geophysics |
| url | http://dx.doi.org/10.1002/jgrd.50466 |