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• W289347616 abstract "approved: P. Ted Strub In this thesis, the method of estimating sea surface velocities from sequences of satellite Advanced Very High Resolution Radiometer (AVHRR) and Coastal Zone Color Scanner (CZCS) images using the objective maximum cross-correlation (MCC) technique is examined. Two main focuses are discussed. The first is to validate the MCC method and the second is to apply the method to the coastal ocean off Cape Blanco, Oregon. A set of synthetic images is created by advecting an AVHRR temperature field with a QG model velocity field. The MCC method of determining the sea surface velocities is then applied to the synthetic images. RMS differences between the model's velocity field and the field produced by the MCC method are calculated. In addition, real AVHRR and CZCS images are used to find the RMS difference between the satellite-derived velocity fields and in situ ADCP and hydrographic data. The tests show that AVHRR imagery yields the best results Redacted for Privacy when images are separated by as short a period as possible. RMS errors at 6-hour separation are on the order of 0.14 ms1, growing to 0.25 ms1 at separations of more than 18 hours. CZCS images are always separated by 24 or more, but images with well defined features result in RMS differences less than those produced by AVHRR images separated by 12 and 24 hours and greater correlations to ADCP velocities. Specific examples show some of the reasons for incorrect vectors calculated by the method. The second focus describes the circulation patterns seen off Cape Blanco, Oregon during 1987 and 1988. The AVHRR image set resulted in two main conclusions. First, the mid-July sequence shows a strong jet that is clearly visible in the images from that time period. This sequence of images is an ideal sequence which has 1) a persistent wind associated with it; 2) strong, visible features; 3) images which are separated by less than 18 hours; and 4) several pairs that allow averaging to be done. The procedure that was conducted to produce the welldefined flow visible in the first complex EOF was to first remove the vectors with a maximum correlation coefficient less than 0.7 and then, if the field still contained vectors inconsistent with the rest of the field, apply the vector consistency check. The second conclusion, is that the spring/summer view of the circulation pattern is of a meandering jet, flowing strongly offshore north of the capes with a weaker, onshore flow south of Cape Blanco. Sea Surface Velocity Determination Using Satellite Imagery: Validation and An Application by Robin Tokmakian A THESIS submitted to Oregon State University in partial fulfillment of the requirements for the degree of Master of Science Completed December 8, 1989 Commencement June 1990" @default.
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• W289347616 date "1989-12-08" @default.
• W289347616 modified "2023-09-27" @default.
• W289347616 title "Sea surface velocity determination using satellite imagery : validation and an application" @default.
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