GA_INTERSECTS - Transect-Shoreline Intersection Points for Georgia 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）中，借助美国地质调查局（United States Geological Survey, USGS）与TPMC环境服务公司联合开发的ArcView扩展工具——数字海岸线分析系统（Digital Shoreline Analysis System, DSAS）2.0版本，生成了长、短期海岸线变化速率。该扩展工具旨在引导用户高效完成海岸线变化分析的核心步骤。这款ArcView扩展工具包含三大核心功能组件：一是划定基线，二是沿海岸以用户自定义的间隔生成正交断面，三是计算变化速率，涵盖线性回归、端点速率、平均速率、平均端点值以及刀切法。