Patent ID: 9651698
Date: 2017-05-16
CPC Classifications: G01S,G01V

Claim:
1. A computer implemented multi-beam bathymetric chart construction method executed on a processor based on submarine digital depth model feature extraction, comprising the following steps of: Step 1, constructing, on a processor, a digital depth model (DDM) by processing raw multi-beam data using a multi-beam postprocessing system as following: 1.1) applying tide correction, draft correction and sound velocity correction to the raw multi-beam echo sounding data set Raw={raw 1.2) building a topographic trend surface, using automatic filtering method to process Proc1={proc1 1.3) using three-view projection to process Proc2={proc2 1.4) using Inverse Distance Weighted (IDW) method, building a digital model of Proc3={x  wherein ddm Step 2, establishing, on a processor, a depth, slope and second derivative composite model (DSSM) based on the DDM, Step 3, extracting feature points based on DDM sub-blocks, 3.1) model sub-blocking: 3.2) Calculating the sub-blocking model: 3.3) determining concavity and convexity of the sub-blocking model, 3.4) determining a feature depth point of the sub-blocking model, 3.5) identifying the feature points of the model, Step 4, querying the multi-beam sounding data based on the feature points, Step 5, constructing the multi-beam bathymetric chart based on layers,