#!/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 26.37739466 56.11467076 -gcp 21600.0 0.0 26.32555681 56.11302014 -gcp 21600.0 21975.0 26.32064032 56.14283736 -gcp 0.0 21975.0 26.37635203 56.14580711 GX4599/GX_4599_SD_frame_58.jpg GX_4599_SD_frame_58.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "864.0 2851.63623046875\n762.545654296875 19666.90869140625\n21270.544921875 19819.63623046875\n21257.45361328125 2714.181884765625" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_58.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_58.vrt GX_4599_SD_frame_58.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_58.cut.vrt GX_4599_SD_frame_58.xyz