#!/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 24.048589468002323 56.975582110136536 -gcp 21600.0 0.0 24.074542522430427 56.97490967239785 -gcp 21600.0 21606.0 24.07358765602112 56.961127998116346 -gcp 0.0 21606.0 24.04784917831421 56.96136490307051 GX4799/GX_4799_SD_frame_106.jpg GX_4799_SD_frame_106.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1056.0 2904.0\n984.0 19536.0\n21264.0 19632.0\n21216.0 3048.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_106.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_106.vrt GX_4799_SD_frame_106.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_106.cut.vrt GX_4799_SD_frame_106.xyz