#!/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 25.1756374 55.81865017 -gcp 21600.0 0.0 25.22524167 55.81041296 -gcp 21600.0 21789.0 25.2114027 55.78144855 -gcp 0.0 21789.0 25.15932547 55.79005734 GX4599/GX_4599_SD_frame_123.jpg GX_4599_SD_frame_123.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "864.0 2712.0\n924.0 19608.0\n21384.0 19656.0\n21276.0 2520.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_123.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_123.vrt GX_4599_SD_frame_123.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_123.cut.vrt GX_4599_SD_frame_123.xyz