VCMP Sites - Shoreline Trends
The Shoreline Trends dataset features short-term and long-term shoreline trends across sites monitored by the Victorian Coastal Monitoring Program (VCMP) along Victoria's coastline, spatially represented as point data.
The VCMP drone survey short-term outputs include shorelines for each survey, taking the ‘shoreline’ as the +1 m AHD contour for Open Coast sites, and +0.5 m AHD contour for large bay sites.
Drone survey data collection is performed as described in Pucino et al., 2021 and Ierodiaconou et al., 2022, and outlined as:
- Data processing and quality control conducted within the Propeller platform (https://vcmp.prpellr.com), with additional manual quality control checks, to achieve a horizontal-vertical uncertainty of 0.1 m or better (Pucino et al., 2021), with output products of Digital Surface Models (DSM) and ortho-mosaics.
- Analysis is conducted using a statewide framework of 30-m spaced transects
Shoreline change trends are determined for each transect, defining a ‘short-term trend’ as being based on the last 2-years of data.
Long-term shoreline trends are obtained for the period 1988 to 2021 (34 years) using the satellite extracted, annually averaged shorelines from Digital Earth Australia (DEA) coastlines (Bishop-Taylor et al., 2021).
All shoreline data (short-term VCMP drone and long-term DEA satellite) are interpolated to the same set of 30-m spaced transects, based on the Digital Earth Australia 2019 product.
Aerial images are hosted and geo-rectified by DEECA's Coordinated Imagery Program. Based on control point checks by VCMP, newer images (approx. post-2000) are estimated to have horizontal uncertainty of 3-m or less. Older
images (pre-2000) can have greater uncertainty, estimated at up to 10-m. Older images (<1960)
may have larger errors (unconstrained) and should be treated with caution.
For all shoreline data sources (UAV, DEA, aerial), trends are calculated as a simple linear regression across
the full dataset, at each transect, for each data source. Standard deviations and 95% confidence intervals
are also included for each data point.
Vertical uncertainty for the output digital surface model (DSM) is estimated at 0.1 m
More information about the Shoreline trend dataset and other datasets generated from the Victorian Coastal Monitoring Program can be found at https://www.marineandcoasts.vic.gov.au/__data/assets/pdf_file/0041/688397/VCMP_Sites_MetadataReport_Oct2023.pdf
