Research On Key Technology Of Constructing 3D Terrain Environment Of Marine Fishery

Submarine topography is an important factor affecting the behavior of fish migration,distribution,feeding and colony.The 3D terrain environment of fishing ground is constructed by visualization technology,and the main features of the geomorphology of bottom of fishing ground can be reappeared.It is of great significance for accurate analysis and forecast of fishing situation,selection of fishing operation methods,selection of efficient fishing gear equipment,and improvement of catch yield.In this paper,based on Digital Elevation Model digital(DEM)and Digital Shading Mapping,selecting the optimal DEM interpolation algorithm and shadow light source parameters,establishing the symbol database of fishery resources,making the geomorphological map of marine fishing ground,the fusion of multi-source,multi-dimensional and heterogeneous data is realized.The 3D terrain information system of marine fishing ground is designed and developed by using Visual Studio 2010 development environment and ArcGIS Engine secondary development component,and realizes the visualization of ocean fishing ground 3D terrain.It provides important basic information support for marine fishery production,management and scientific research.The main work and contributions of this paper are as follows:(1)This paper analyzes and summarizes the research progress of 3D visualization technology,as well as the research status of ocean 3D terrain,and expounds the significance,purpose and main contents of this paper;(2)This paper analyzes the relationship between the terrain environment of fishing ground and marine fishing ground,and introduces the basic terrain model and algorithm of constructing 3D terrain of marine fishing ground,including: DEM data source,DEM structure model,DEM interpolation algorithm and so on.Through the analysis of each link above,the data source and structure model of marine fishing ground topography are determined;(3)The design scheme of the geomorphologic map of the marine fishing ground is put forward.The optimal DEM interpolation algorithm is selected by using the ESRI ArcGIS software system and the suitable depth data through the experimental method and error analysis.By using seabed DEM data as information source,through Digital Shading Mapping and other techniques,the best shaded light source parameters are analyzed and selected,and sea bottom shading map is generated.Based on Font Creator Program and ArcGIS software,this paper establishes the symbol database of fishery resources,designs a reasonable filling ribbon,and makes a geomorphological map of marine fishing ground to show the fluctuation of submarine topography and the distribution of fish biological resources;(4)This paper puts forward the overall design of 3D terrain information system of marine fishing ground with Visual Studio 2010 as development environment and ArcGIS Engine as secondary development component,and expounds the key technology and realization method of system design in detail.Finally,the 3D terrain visualization of marine fishing ground is realized by using the seabed DEM data,and the functions of contour generation and slope analysis are demonstrated.