GIS-Based Tool for Extracting Shoreline Postions from Aerial Imagery (BeachTools).

摘要

This Coastal and Hydraulics Engineering Technical Note (CHETN) presents BeachTools, an ArcView 3.x Geographic Information Systems (GIS) extension designed to identify and quantitatively establish the position of the shoreline and other coastal features from aerial imagery. Aerial imagery, i.e., digitized aerial photography, is commonly analyzed to qualitatively and quantitatively study the evolution of coastal inlet geomorphology. Methodologies for calculating sediment budgets and analyzing inlet-ebb shoal evolution based upon data derived from aerial photography can be found in CETN- IV-15 (Rosati and Kraus 1999) and CETN-IV-13 (Stauble 1998), respectively. BeachTools is designed to facilitate such studies by providing a suite of tools that allows for the automatic delineation of coastal features and the generation of baselines and transects, removing the tedium and subjectivity of extracting data by hand, and allowing for much greater precision of such measurements.