#!/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 25.82653938 56.59223127 -gcp 21600.0 0.0 25.78165636 56.57612903 -gcp 21600.0 21792.0 25.75028914 56.60063319 -gcp 0.0 21792.0 25.79646868 56.61957637 GX4599/GX_4599_SD_frame_88.jpg GX_4599_SD_frame_88.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 3000.0\n864.0 19680.0\n21456.0 19704.0\n21432.0 2760.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_88.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_88.vrt GX_4599_SD_frame_88.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_88.cut.vrt GX_4599_SD_frame_88.xyz