Time-series of shoreline change along the Pacific Rim

This repository contains 30+ years of tidally-corrected shoreline change data along the Pacific Rim. This data set was used in <em>Vos et al. 2021, "Large regional variability in coastal erosion caused by ENSO", </em>to investigate the impact of ENSO on interannual shoreline variability in the Pacific Basin. <em>CoastSat</em> was used to map shoreline changes on Landsat 5, 7 and 8 imagery. The time-series of shoreline change were tidally-corrected along cross-shore transects using tide levels from a global tide model (FES2014) and a satellite-derived estimate of the beach slope (as described in <em>Vos et al. 2020, "Beach slopes from satellite-derived shorelines")</em>. This data set covers wave-dominated sandy beaches in the Pacific basin where Landsat imagery was available, a total of 3,071 beach and 122,122 cross-shore transects (100-m alongshore spaced). This includes coastlines in Australia, New Zealand, Japan, Chile , Peru, Mexico and USA (California and Hawaii only). The data is structured as follows: There is a folder for each country (e.g. Australia) In the country folder, there is a folder for each site (e.g. aus0001, aus0002 etc) In the site folder, there are 4 CSV files: <em>time_series_tidally_corrected.csv</em>: this file contains the tidally-corrected time-series of shoreline change along each transect belonging to the site (e.g. aus0001-0001, aus0001-0002 etc). This is the final product used for coastal change analyses. <em>time_series_raw.csv</em>: this file contains the raw time-series of shoreline change, which have not be tidally-corrected. Note that each image is taken at a different stage of the tide. <em>tide_levels_fes2014</em>: this file contains the tide levels at the time of image acquisition extracted from FES2014 (global tide model publicly available on AVISO+). <em>transect_coordinates_and_beach_slopes.csv</em>: this file contains the coordinates (in WGS84 lat/lon coordinates) as well as the estimated beach slope for each transect. In addition, there are four geospatial layers (.GEOJSON) which contain important spatial information: <em>polygons.geojson</em>: this layer contains the polygons that were used to run CoastSat for each beach. <em>shorelines.geojson</em>: this layer contains the sandy shorelines that were used to generate the cross-shore transects (also used as reference shorelines in CoastSat). Each beach has the following attributes: beach length, median orientation, median slope, and mean springs tidal range. <em>transects.geojson</em>: this layer contains the cross-shore transects, which are spaced 100 m along each beach. Each transect has the following attributes: orientation, beach slope, linear trend (in m/year), alongshore distance relative to the northern end of the beach (absolute and normalised). <em>transects_edit.geojson</em>: this layer is the same as transects.geojson where transects that are not suitable for shoreline mapping were deleted (rocky shores, submerged reef, coastal lagoons and inlets, coastal defences etc...)