TX_TRANSECTS_ST - Short-Term Shoreline Change Rates for Texas Generated at a 50m Transect Spacing, 1970-2001

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），借助美国地质调查局（U.S. Geological Survey, USGS）与TPMC环境服务公司联合开发的ArcView扩展模块——数字海岸线分析系统（Digital Shoreline Analysis System, DSAS）2.0版，生成了长、短期海岸线变化速率数据。该扩展模块旨在为使用者高效引导海岸线变化分析的全流程关键步骤。此ArcView扩展模块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间距生成正交断面，三是计算海岸线变化速率，其支持的计算方法包括线性回归、端点速率、速率均值、端点均值以及刀切法五种。