# Data fetched via HTTP from ['https://www.bodc.ac.uk/data/open_download/gebco/gebco_2023/zip/']

# Data processed using the following steps:

unzip {input_dir}/gebco_2023.zip -d {output_dir} 

gdalwarp -t_srs EPSG:3413 -r bilinear -te -5774572.727594967 -5774572.727594967 5774572.727594967 5774572.727594967 -tr 400 400 NETCDF:{input_dir}/GEBCO_2023.nc:elevation {output_dir}/warped.tif

gdalwarp -cutline {assets_dir}/latitude_shape_40_degrees.geojson -crop_to_cutline -co COMPRESS=DEFLATE {input_dir}/warped.tif {output_dir}/bathymetric_chart.tif

gdal_translate -co TILED=YES -co COMPRESS=DEFLATE -co PREDICTOR=2 {input_dir}/bathymetric_chart.tif {output_dir}/compressed.tif

cp {input_dir}/compressed.tif {output_dir}/bathymetric_chart.tif && gdaladdo -r average {output_dir}/bathymetric_chart.tif 2 4 8 16