#!/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 26.14708543 56.38731481 -gcp 21600.0 0.0 26.10125279 56.3736138 -gcp 21600.0 21792.0 26.07382368 56.40009801 -gcp 0.0 21792.0 26.12261652 56.41443159 GX4599/GX_4599_SD_frame_74.jpg GX_4599_SD_frame_74.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 2712.0\n552.0 19320.0\n21384.0 19536.0\n21288.0 2508.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_74.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_74.vrt GX_4599_SD_frame_74.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_74.cut.vrt GX_4599_SD_frame_74.xyz