A multi-method dataset of shoreline position at Narrabeen-Collaroy Beach from sub-daily to decadal timescales (1930 to 2021)

This repository contains a 91‑year, multi‑method shoreline dataset for Narrabeen-Collaroy Beach, New South Wales, Australia - one of the world’s most intensively monitored sandy coastlines. The dataset comprises 10,334 individual shorelines (>2.5 million shoreline data points) spanning 1930–2021 and integrates 13 complementary survey techniques, including historical and commercial aerial photography, Landsat and PlanetScope satellite–derived shorelines, Argus coastal imaging (near‑daily coverage for 19 years), RTK‑GNSS quad‑bike surveys, airborne lidar, a continuously scanning terrestrial lidar transect, and community‑sourced CoastSnap observations. All shoreline positions are referenced to a consistent vertical datum and transformed into a unified alongshore–cross‑shore coordinate system that accounts for the embayed (log‑spiral) planform. Method‑specific uncertainties (bias, standard deviation, and RMSE) were quantified against high‑accuracy RTK‑GNSS and airborne lidar benchmarks a..., , ## Dataset Title **A 91‑year multi‑method shoreline dataset spanning sub‑daily to decadal scales at Narrabeen‑Collaroy Beach, Australia (1930–2021)** --- ## Authors Mitchell D. Harley\ Raimundo Ibaceta\ Ian L. Turner\ Kristen D. Splinter\ Melissa A. Bracs\ Yarran Doherty\ Nashwan Matheen\ Jason Middleton\ Matthew S. Phillips\ Kilian Vos\ Andrew D. Short --- ## Corresponding Author **Mitchell D. Harley**\ School of Civil and Environmental Engineering\ UNSW Sydney\ Sydney, NSW, Australia --- ## Geographic Coverage * **Location:** Narrabeen‑Collaroy Beach, New South Wales, Australia * **Approximate coordinates:** 33.7° S, 151.3° E * **Beach length:** ~3.6 km embayed sandy beach --- ## Temporal Coverage * **Start:** 1930 * **End:** 2021 * **Temporal resolution:** sub‑daily to multi-decadal (method dependent) --- ## Data Files Included ### 1. `Narrabeen_Shoreline_Dataset_v1.csv` Primary dataset containing all shoreline observations. Each row represents a single shoreline po..., ,