#!/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 25.16440988 55.88829129 -gcp 21600.0 0.0 25.2163088 55.8894704 -gcp 21600.0 21789.0 25.21968751 55.85923541 -gcp 0.0 21789.0 25.16502133 55.85787478 GX4599/GX_4599_SD_frame_120.jpg GX_4599_SD_frame_120.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "888.0 2832.0\n768.0 19536.0\n21288.0 19848.0\n21276.0 2424.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_120.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_120.vrt GX_4599_SD_frame_120.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_120.cut.vrt GX_4599_SD_frame_120.xyz