#!/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 24.1392217 56.93003156 -gcp 21600.0 0.0 24.0888771 56.92437442 -gcp 21600.0 21729.0 24.0778079 56.95202281 -gcp 0.0 21729.0 24.12913579 56.95815811 GX2200/GX_2200_SD_frame_77.jpg GX_2200_SD_frame_77.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1008.0 3033.0\n1056.0 19704.14674819344\n21240.0 20015.799888827125\n21024.0 3215.839911061702" | \
  gdaltransform -tps -output_xy GX_2200_SD_frame_77.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2200_SD_frame_77.vrt GX_2200_SD_frame_77.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2200_SD_frame_77.cut.vrt GX_2200_SD_frame_77.xyz