Date of Award

Fall 2014

Project Type

Thesis

College or School

CEPS

Program or Major

Ocean Engineering

Degree Name

Master of Science

First Advisor

Brian Calder

Second Advisor

Kurt Schwehr

Third Advisor

Steve Wineberg

Abstract

B-spline snake methods have been used in cartographic generalization in the past decade, particularly in the generalization of nautical charts where these methods yield good results with respect to the shoal-bias rules for the generalization of chart contours. However, previous studies only show generalization results at particular generalization (or scale) levels, and show only two states of the algorithm: before and after generalization, but nothing in between. This thesis presents an improved method of using B-spline snakes and other auxiliary functions and workflows for generalization in the context of nautical charts which can generalize multiple nautical chart features from large scale to small scale without creating any invalid intermediate features that require special processing to resolve. This process allows users to generate charts at any intermediate scale without cartographic irregularities, and is capable of extension to include more specialized generalization operators.

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