FL_BASELINE - Offshore Baseline for Florida Atlantic Coast Generated to Calculate Shoreline Change Rates

Rates of long-term and short-term shoreline change were generated in a GIS with the Digital Shoreline Analysis System (DSAS) version 2.0, an ArcView extension developed by the USGS in cooperation with TPMC Environmental Services. The extension is designed to efficiently lead a user through the major steps of shoreline change analysis. This extension to ArcView contains three main components that define a baseline, generate orthogonal transects at a user-defined separation along the coast, and calculate rates of change (linear regression, endpoint rate, average of rates, average of endpoints, jackknife).

本研究在地理信息系统（Geographic Information System，GIS）环境下，借助数字岸线分析系统（Digital Shoreline Analysis System，DSAS）2.0版，生成了长、短期岸线变化速率。该系统是美国地质调查局（United States Geological Survey，USGS）与TPMC环境服务公司联合开发的ArcView扩展模块。该扩展模块旨在高效引导用户完成岸线变化分析的核心流程步骤。这款ArcView扩展模块包含三大核心功能组件：可划定岸线基线、沿海岸以用户自定义间隔生成正交断面，以及计算岸线变化速率，涵盖的计算方法包括线性回归法、端点速率法、速率平均值法、端点平均值法与刀切法（jackknife）。