Cloud motion vectors from MISR using sub-pixel enhancements
✍ Scribed by Roger Davies; Ákos Horváth; Catherine Moroney; Banglin Zhang; Yanqiu Zhu
- Book ID
- 104091754
- Publisher
- Elsevier Science
- Year
- 2007
- Tongue
- English
- Weight
- 408 KB
- Volume
- 107
- Category
- Article
- ISSN
- 0034-4257
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✦ Synopsis
The operational retrieval of height-resolved cloud motion vectors by the Multiangle Imaging SpectroRadiometer on the Terra satellite has been significantly improved by using sub-pixel approaches to co-registration and disparity assessment, and by imposing stronger quality control based on the agreement between independent forward and aft triplet retrievals. Analysis of the fore-aft differences indicates that CMVs pass the basic operational quality control 67% of the time, with rms differencesin speed of 2.4 m/s, in direction of 17°, and in height assignment of 290 m. The use of enhanced quality control thresholds reduces these rms values to 1.5 m/s, 14°and 165 m, respectively, at the cost of reduced coverage to 45%. Use of the enhanced thresholds also eliminates a tendency for the rms differences to increase with height. Comparison of CMVs from an earlier operational version that had slightly weaker quality control, with 6-hour forecast winds from the Global Modeling and Assimilation Office yielded very low bias values and an rms vector difference that ranged from 5 m/s for low clouds to 10 m/s for high clouds.