The Assessment on the Accuracy of Chart Datum Transfer Algorithm

摘要

Chart datum is a vertical reference of ocean depth, which can give the ocean vertical spatial information for Marine Geodesy.Due to time and resource constraints, it is a practical problem of how to determine the chart datum with high accuracy at the short-term tidal stations.In this paper, based on the least-square fitting model, the transfer algorithm for the chart datum at the short-term tidal stations is further developed.Both the accuracy of chart datum computed by this algorithm and the effect on those are presented.The findings of this paper are summarized as follows: The accuracy computed by the least-square fitting model can achieve the centimeter level.The accuracy values determined by the least-square fitting model can further be improved by using the instantaneous ratio of tidal range and selecting the short-distance permanent tidal station.