Construction Of Digital Water Depth Model And Terrain Characteristics Analysis Of Penghu Waterway Based On Multi-source Data Fusio

The construction of digital bathymetric depth models is of great significance to ocean engineering,seabed scientific research,development and protection of seabed resources,etc.Multi-source data fusion brings new opportunities for the current construction of digital bathymetric depth models.The current global ocean bathymetric data has multi-source complexity due to different measurement periods,methods,and precision,which is not conducive to direct application to seabed topography.However,the fusion of multi-source data can effectively improve the quality of digital water depth models.Now Most of the global digital bathymetric model datasets have resolutions ranging from 15″ to 1′.In order to ensure the quality of fusion,it is necessary to verify the quality of these digital bathymetric models.This paper selects some areas of the Penghu waterway as the research object,and analyzes many The source data fusion method was studied,and the digital water depth model of the area was constructed at the same time.The main work is as follows:1.First,sort out the sources of the six most widely used digital bathymetric depth model data and single beam data and chart data,preprocess the multi-source data,and focus on the quality assessment of multiple digital bathymetric depth model data process and method.2.In view of the characteristics of the multi-source depth data of Penghu waterways,on the basis of summarizing and analyzing the commonly used digital bathymetric depth model construction methods,an adaptive sub-area multi-source depth data weighted fusion framework is proposed to finally generate a new Penghu Channel digital bathymetric depth model,which not only improves the quality of the original digital water depth model of Penghu water channel as a whole,supplements the data blank area,but also retains the detailed information of highprecision data.3.The accuracy evaluation of the constructed digital bathymetric depth model is carried out,and the analysis shows that the root mean square error(RMSE)of the constructed digital bathymetric depth model is improved by more than 12% compared with the original digital water depth models.In addition,the topographic factor analysis of the seabed topography of Penghu Waterway was carried out,and its slope and aspect,topographic relief,surface cutting depth,surface roughness,elevation variation coefficient,etc.were extracted,and the topographic factor regression was carried out for the study area.After processing and calculating its comprehensive terrain complexity index,it is finally found that the Penghu waterway has the highest comprehensive terrain complexity in the waters near the islands,and the rest of the terrain is relatively flat except for submarine ridges and sea valleys.