PA3660-Coastal Hazard Assessment - 4 arakoon

                                                  Project related




Figure 3-8 2017 Aerial Photograph (qimagery.information.qld.gov.au


3.1             Satellite Imagery
Satellite imagery can be used to determine shoreline position and behaviour from 30+ years of satellite
imagery. Satellite platforms include Landsat 5 (1984 - 2013), 7 (1999 - present), 8 (2013 - present) and
Sentinel-2 (2015 - present), with pixel resolution ranging between 10m and 15m and image capture
varying from 5 to 16 days.

Two independent tools have been developed to analyse the satellite imagery, which are:

     1. CoastSat a Python tool that enables extraction of shoreline position from individual satellite
        images at any coastline worldwide using sub-pixel extraction methods (Vos et al., 2019a, 2019b).
        While the horizontal errors for detected shoreline range have been reported to be between 7.3m
        and 12.7m Root Mean Square Error (RMSE) considering individual images, the bias of the data is
        much lower (Vos et al., 2019a). As such, the temporal resolution of the data means that signals
        can be discerned at seasonal and greater timescales.

     2. Digital Earth Australia (DEA) is a tool to accurately map the boundary between land and water
        (the ‘waterline’) (Bishop-Taylor et al, 2019). The tool uses the same sub-pixel extraction method
        as CoastSat. However, DEA combines aerials to provide a single, annualised shoreline position
        and is therefore suited to determining long-term trends.

Outputs from both CoastSat and DEA are available online, with key outputs for the coastline adjacent to
the site are provided in Figure 3-9 to Figure 3-11.

11 April 2024         4-6 ARAKOON CRESCENT, SUNSHINE BEACH           PA3660-RHD-XX-ZZ-RP-Z-0001   14