A Method for Digital Terrain Reconstruction Using Longitudinal Control Lines and Sparse Measured Cross Sections

Using longitudinal control lines and sparse measured cross sections with large spaces, a new method for quickly reconstructing digital terrains in natural riverways is presented. The riverway, mainly including the river boundaries, thalweg, dividing of floodplains main channel, water edges, can be obtained by interpreting satellite images, remote sensing images or site surveys. Then, are introduced into quadrilateral grid generation as auxiliary that riverway trends reflect transverse terrain changes. equal cross-sectional area principle at same level, all reasonably fitted. On above basis, virtue fitted data weighted distance method, interpolations along conducted to obtain elevation nodes. Finally, according readable text formats MIKE21 SMS, gridded connection information output computer programming achieve good construction exchange channels fully exploit special advantages various software programs visualization further utilization.