#!/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 24.18400576 56.93394535 -gcp 21600.0 0.0 24.13322739 56.94867748 -gcp 21600.0 21168.0 24.16076974 56.97725638 -gcp 0.0 21168.0 24.21183241 56.96042225 GX4190/GX_4190_SD_frame_4.jpg GX_4190_SD_frame_4.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "744.0 2208.2401334074484\n540.0 17795.906614785992\n3420.0 20496.066703724293\n21072.0 20340.07337409672\n20976.0 2231.906614785992" | \
  gdaltransform -tps -output_xy GX_4190_SD_frame_4.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4190_SD_frame_4.vrt GX_4190_SD_frame_4.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4190_SD_frame_4.cut.vrt GX_4190_SD_frame_4.xyz