###	IBCSO bathymetric chart of the Southern Ocean (Version 2)

###	Data downloaded from https://ibcso.org/ibcso-2024-annual-release/ on 2025-09-12
    Dorschel, B., Hehemann, L., Viquerat, S. et al. (2022): The International Bathymetric Chart of the Southern Ocean Version 2 (IBCSO v2) [dataset]. PANGAEA. https://doi.org/10.1594/PANGAEA.937574

###	Processing steps:

    1.  Download files from https://ibcso.org/ibcso-2024-annual-release/

    2.  Project to EPSG:3031 via GDAL
        gdalwarp -t_srs EPSG:3031 -r bilinear input.tif output_epsg3031.tif -co COMPRESS=DEFLATE -co BIGTIFF=IF_SAFER
      
    3.  Convert to COG
        gdal_translate input.tif output_COG.tif -of COG -co COMPRESS=DEFLATE -co BIGTIFF=IF_SAFER
      
    4.  Create derivatives (hillshade, aspect, slope)

        4a. Optionally first convert 16bit to Float32 for better hillshade results
            gdal_translate -ot Float32 input.tif output_f32.tif -co COMPRESS=DEFLATE -co BIGTIFF=IF_SAFER
        
        4b. Derive hillshade, aspect, slope
            gdaldem hillshade -of COG input.tif hillshade.tif -compute_edges -z 1 -az 315 -alt 45 -co COMPRESS=DEFLATE -co BIGTIFF=IF_SAFER
            gdaldem aspect -of COG input.tif aspect.tif -co COMPRESS=DEFLATE -co BIGTIFF=IF_SAFER
            gdaldem slope -of COG input.tif slope.tif -co COMPRESS=DEFLATE -co BIGTIFF=IF_SAFER