#!/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 22.43179714 56.67130752 -gcp 21600.0 0.0 22.42422337 56.69388857 -gcp 21600.0 21231.0 22.46539845 56.69781688 -gcp 0.0 21231.0 22.47166516 56.67493495 GX4471/GX_4471_SD_frame_81.jpg GX_4471_SD_frame_81.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1032.0 1992.0\n1008.0 19128.0\n21504.0 19344.0\n21486.0 2052.0" | \
  gdaltransform -tps -output_xy GX_4471_SD_frame_81.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4471_SD_frame_81.vrt GX_4471_SD_frame_81.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4471_SD_frame_81.cut.vrt GX_4471_SD_frame_81.xyz