#!/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 26.29350185 55.91826152 -gcp 21600.0 0.0 26.26847148 55.94767993 -gcp 21600.0 21975.0 26.31642938 55.96195138 -gcp 0.0 21975.0 26.35098696 55.93241159 GX4599/GX_4599_SD_frame_50.jpg GX_4599_SD_frame_50.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 2808.0\n864.0 19800.0\n21384.0 19848.0\n21360.0 2664.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_50.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_50.vrt GX_4599_SD_frame_50.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_50.cut.vrt GX_4599_SD_frame_50.xyz