#!/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 25.37387685 56.18138369 -gcp 21381.0 0.0 25.37783861 56.21012611 -gcp 21381.0 20811.0 25.43097854 56.20875073 -gcp 0.0 20811.0 25.42645097 56.17844409 GX1006/GX_1006_SD_frame_133.jpg GX_1006_SD_frame_133.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "744.0 2520.0\n552.0 18768.0\n21240.0 19008.0\n21072.0 2592.0" | \
  gdaltransform -tps -output_xy GX_1006_SD_frame_133.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_1006_SD_frame_133.vrt GX_1006_SD_frame_133.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_1006_SD_frame_133.cut.vrt GX_1006_SD_frame_133.xyz