#!/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 24.08146262 56.9724625 -gcp 21381.0 0.0 24.13291812 56.97319346 -gcp 21381.0 20811.0 24.13438797 56.94509122 -gcp 0.0 20811.0 24.08272862 56.94454698 GX4199/GX_4199_SD_frame_142.jpg GX_4199_SD_frame_142.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "612.0 2064.0\n756.0 18804.0\n20568.0 18588.0\n20568.0 2112.0" | \
  gdaltransform -tps -output_xy GX_4199_SD_frame_142.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4199_SD_frame_142.vrt GX_4199_SD_frame_142.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4199_SD_frame_142.cut.vrt GX_4199_SD_frame_142.xyz