AL_INTERSECTS - Transect-Shoreline Intersection Points for Alabama 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 U.S. Geological Survey (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).

本研究借助地理信息系统（Geographic Information System, GIS），采用美国地质调查局（U.S. Geological Survey, USGS）与TPMC环境服务公司联合开发的ArcView扩展模块——数字岸线分析系统（Digital Shoreline Analysis System, DSAS）2.0版本，生成了长、短期岸线变化速率数据。该扩展模块旨在引导用户高效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：分别用于划定岸线基线、沿海岸按用户自定义间距生成正交断面，以及计算岸线变化速率，支持线性回归法、端点速率法、速率平均值法、端点平均值法以及刀切法（jackknife）五种计算方式。