NORCAL_BASELINES - Offshore Baseline for Northern California Generated to Calculate Shoreline Change Rates

Rates of long-term and short-term shoreline change were generated in a GIS using the Digital Shoreline Analysis System (DSAS) version 3.0; An ArcGIS extension for calculating shoreline change: U.S. Geological Survey Open-File Report 2005-1304, Thieler, E.R., Himmelstoss, E.A., Zichichi, J.L., and Miller, T.M. The extension is designed to efficiently lead a user through the major steps of shoreline change analysis. This extension to ArcGIS 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).

本数据集的长期与短期岸线变化速率通过地理信息系统（Geographic Information System，GIS），依托数字岸线分析系统（Digital Shoreline Analysis System，简称DSAS）3.0版本生成；该系统是一款用于计算岸线变化的ArcGIS扩展模块，相关文献来自美国地质调查局公开文件报告2005-1304，作者为Thieler, E.R.、Himmelstoss, E.A.、Zichichi, J.L.及Miller, T.M.。此扩展模块旨在帮助用户高效完成岸线变化分析的核心步骤。该ArcGIS扩展模块包含三大核心功能：一是划定岸线基线，二是沿海岸生成用户自定义间距的正交断面，三是计算岸线变化速率，具体方法涵盖线性回归、端点速率法、速率平均值法、端点平均值法以及刀切法。