Assessment of the Potential Role of Multispectral Imagery in Bathymetric Charting

摘要

Previous research has demonstrated the feasibility of deriving water depth information from Landsat Multispectral Scanner (MSS) digital data. However, previously published results, analysed together with two new case studies, show that the magnitude of errors (approximately 1-2 meters) in MSS singleband depth extimates is too large for direct production of bathymetric charts. Better accuracy is possible, though, if MSS data are used to interpolate conventional soundings between survey tracklines, especially if the survey vessels obtain concurrent optical ground truth data. If depth accuracy standards can be met, the MSS interpolation approach will be extremely cost effective. In addition, MSS imagery is shown to be a useful tool for planning and managing conventional surveys. A recommended set of procedures is outlined for incorporating MSS image data into an operational bathymetric mapping program. A comprehensive program of development and operational demonstration surveys is recommended to convincingly establish the utility and cost effectiveness of these procedures.