#!/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 23.77872675 56.65376714 -gcp 21600.0 0.0 23.7537923 56.62882193 -gcp 21600.0 22038.0 23.70657716 56.64251535 -gcp 0.0 22038.0 23.73166517 56.66855439 GX4598/GX_4598_SD_frame_172.jpg GX_4598_SD_frame_172.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "744.0 2976.0\n888.0 19776.0\n21072.0 19848.0\n21264.0 3312.0" | \
  gdaltransform -tps -output_xy GX_4598_SD_frame_172.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4598_SD_frame_172.vrt GX_4598_SD_frame_172.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4598_SD_frame_172.cut.vrt GX_4598_SD_frame_172.xyz