#!/bin/bash

GDAL_TILE_PROCESSES=16
GDAL_TILE_ZOOMS=8-14
GDAL_SAMPLING_WARP=cubic
GDAL_SAMPLING_TILE=antialias

# Create virtual dataset with coordinates
gdal_translate -of VRT -a_srs EPSG:4326 -outsize 300% 300% -gcp 0.0 0.0 23.80662903 56.64653801 -gcp 21600.0 0.0 23.77069678 56.62546006 -gcp 21600.0 21789.0 23.73183193 56.64468165 -gcp 0.0 21789.0 23.76683064 56.66735464 GX4598/GX_4598_SD_frame_169.jpg GX_4598_SD_frame_169.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "912.0 2928.0\n636.0 19584.0\n21264.0 19800.0\n21144.0 3096.0" | \
  gdaltransform -tps -output_xy GX_4598_SD_frame_169.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4598_SD_frame_169.vrt GX_4598_SD_frame_169.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4598_SD_frame_169.cut.vrt GX_4598_SD_frame_169.xyz