A method to construct instantaneous depth model based on a grid tidal model and chart data

Lihua Zhang; Chenghu Zhou; Fenzhen Su; Jun Xu; Zhu Wang

doi:10.1117/12.873284

3 November 2010 A method to construct instantaneous depth model based on a grid tidal model and chart data

Lihua Zhang, Chenghu Zhou, Fenzhen Su, Jun Xu, Zhu Wang

Proceedings Volume 7841, Sixth International Symposium on Digital Earth: Data Processing and Applications; 78411S (2010) https://doi.org/10.1117/12.873284
Event: The Sixth International Symposium on Digital Earth, 2009, Beijing, China

Abstract

Nowadays a depth delineated in a chart is a static depth based on the chart datum, whereas what the ship navigation should consider is an instantaneous depth, namely, the sum of the static depth and dynamic tide height. Aim to the shortage in depth representation, a method to construct an instantaneous depth model based on a grid tidal model and chart data is proposed. Firstly, a regional grid tide model around China is developed based on the Princeton ocean model (POM) using "blending" assimilation approach, and the continuous spatial-temporal tide heights are predicted. Secondly, the tide grids serving for all depths in the chart are determined, the depths are located efficiently in these grids and corresponding tide heights are obtained. Finally, Instantaneous depths are computed and displayed dynamically. Experimental results indicate that the proposed method is efficient for dynamic representation of instantaneous depths, and is also accurate for the representation in wide and plane sea areas.

Citation Download Citation

Lihua Zhang, Chenghu Zhou, Fenzhen Su, Jun Xu, and Zhu Wang "A method to construct instantaneous depth model based on a grid tidal model and chart data", Proc. SPIE 7841, Sixth International Symposium on Digital Earth: Data Processing and Applications, 78411S (3 November 2010); https://doi.org/10.1117/12.873284

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