FL_TRANSECTS_ST - Short-Term Shoreline Change Rates for Florida Generated at a 50m Transect Spacing, 1976-2001

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扩展模块——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，以下简称GIS）环境中生成了长、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步骤。该ArcView扩展模块包含三大核心功能模块：可定义岸线基线、可沿海岸按照用户自定义间距生成正交断面，以及可计算岸线变化速率，具体计算方法涵盖线性回归法、端点速率法、速率平均值法、端点平均值法以及刀切法（jackknife）。