LA_TRANSECTS_ST - Short-Term Shoreline Change Rates for Louisiana Generated at a 50m Transect Spacing, 1973-2001

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).

本研究依托地理信息系统（Geographic Information System, GIS），使用由美国地质调查局（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。该扩展工具旨在协助用户高效完成海岸线变化分析的核心流程步骤。这款ArcView扩展工具包含三大核心功能模块：一是划定分析基线，二是沿海岸以用户自定义间距生成正交断面，三是计算海岸线变化速率，涵盖线性回归法、端点速率法、速率平均值法、端点平均值法以及刀切法。