MS_TRANSECTS_LT - Long-Term Shoreline Change Rates for Mississippi Generated at a 50m Transect Spacing, 1850-2001

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).本研究借助由美国地质调查局（U.S. Geological Survey, USGS）与TPMC环境服务公司联合开发的ArcView扩展工具——数字岸线分析系统（Digital Shoreline Analysis System, DSAS）2.0版本，在地理信息系统（Geographic Information System, GIS）中生成了长、短期岸线变化速率。该扩展工具专为高效引导用户完成岸线变化分析的核心步骤而设计。这款ArcView扩展工具包含三大核心功能模块：一是定义岸线基线，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（jackknife）五种方法。