Experimental Analysis of Height Anomaly Fitting Model based on Grid in Ocean Surveying and Mapping
Taking the East China Sea area in Zhoushan,Zhejiang Province as the experimental area,using the grid elevation data generated by the Zhejiang Provincial Satellite Navigation and Positioning Reference Service Platform,combining the quadratic surface fitting model,a height anomaly fitting model was established for different partition areas and grid spacing of different control points.Statistical analysis was conducted on the accuracy characteristic indicators of each fitting model.The results showed that as the partition area gradually increases,the fitting accuracy gradually decreases.Therefore,it should be considered that multiple partitions can improve fitting accuracy.At the same time,it should be noted that excessive partitioning can also increase the amount of engineering calculations.Therefore,in marine surveying and mapping work,both accuracy and economic benefits should be taken into account to select appropriate zoning areas.As the spacing between control point grids gradually decreases,the fitting accuracy gradually improves,but the improvement was relatively small.This indicates that in the case of uniform distribution of control points,reducing the spacing between control points was beneficial for improving the accuracy of model fitting,but the impact was limited.
gridquadratic surface fitting modelmarine surveying and mappingpartition areacontrol point spacing
万方数据
维普
