Multi-Year Coastline Extraction and Change Detection using Landsat 8 Imagery in Google Earth Engine

In this tutorial, we dive deep into coastal change analysis using Landsat 8 imagery (2014–2024) within Google Earth Engine (GEE). Learn how to extract coastlines, detect shoreline shifts, and analyze long-term erosion and accretion patterns — all through automated satellite-based techniques.
What You’ll Learn,
How to define and visualize your coastal study area in GEE, create cloud-free Landsat composites using masking techniques, apply AWEI (Automated Water Extraction Index) with Otsu Thresholding for precise water detection, extract and vectorize coastlines for multiple years (2014 & 2024), perform change detection to identify shoreline movement and flood-prone zones, export your coastline vectors as SHP files for GIS analysis.
Techniques Covered
Landsat 8 Surface Reflectance processing, automated cloud and shadow masking, AWEI + Otsu-based water delineation, vectorization and change mapping, coastal monitoring using time-series analysis. Whether you’re a researcher, coastal engineer, GIS analyst, or Earth Engine enthusiast, this video will help you automate coastline mapping and monitor shoreline dynamics with ease!
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Useful link
Code link:
https://code.earthengine.google.com/3...
USGS Landsat 8 Level 2, Collection 2, Tier 1: https://developers.google.com/earth-e...
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