#!/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 24.036785370011877 56.93899840597253 -gcp 21600.0 0.0 24.061878076650817 56.937796943298345 -gcp 21600.0 21975.0 24.059659036812867 56.92380751727421 -gcp 0.0 21975.0 24.0344998264088 56.92494391938764 GX4799/GX_4799_SD_frame_68.jpg GX_4799_SD_frame_68.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "720.0 3024.0\n768.0 19680.0\n21384.0 19680.0\n21024.0 2952.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_68.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_68.vrt GX_4799_SD_frame_68.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_68.cut.vrt GX_4799_SD_frame_68.xyz