Shallow Water Bathymetry Of Satellite Multispectral Stereo Images Through Two-medium Photogrammetry Based On RPC Parameters

With the development of high-resolution satellite remote sensing technology,shallow water bathmetry detection technology has been continuously improved and diversified.Satellite stereo two-media photogrammetry is an important part of optical remote sensing.It realizes bathymetric measurement without control points.In this paper,a systematic study of satellite stereo two-medium remote sensing image bathymetry is carried out.The main contents and innovations are as follows:1)The linear array image constellation model is introduced in detail.According to the refraction law and the geometric relations of the site,target point and image point,the single medium conformation model is transformed into the two medium conformation model.The formula and solution process of three-dimensional reconstruction based on rational function model are deduced in detail.2)Through the direction of flight of satellite imagery,the position relationship between the resolving point of the conformation model and the real target point is analyzed in detail in theory,combines the principle of light refraction to construct a refraction correction model.Thus,a two-medium photogrammetry based on rational polynomial coefficients for satellite stereo images is established,and the error sources of the model are analyzed.3)The flow chart of satellite stereo two-medium bathymetry is designed.It includes radiation calibration,atmospheric correction,model construction,land-water separation,edge line extraction,determination of water surface elevation,refraction correction,output water depth and accuracy evaluation.The processes of solar flare removal,water-land separation edge line extraction,dense matching based on core line image and original DEM generation are described in detail.4)An uncontrolled multi-spectral image depth inversion method supported by two-media photogrammetry is proposed.The accuracy of the solution results of the satellite stereo dual-medium sounding model is evaluated.It is found that the model sounding results meet the accuracy requirement when there is no control point in the research area.Then the multi-spectral inversion model is established by using the calculated sounding results as control.The experimental results show that the uncontrolled inversion has high accuracy.