#!/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 24.79890247 56.7648759 -gcp 21600.0 0.0 24.80571633 56.84846261 -gcp 21600.0 23340.0 24.97448474 56.84502353 -gcp 0.0 23340.0 24.96873532 56.75991532 GX10673/GX_10673_SK_frame_991.jpg GX_10673_SK_frame_991.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 2928.0\n768.0 19704.0\n20280.0 19992.0\n20400.0 2952.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_991.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_991.vrt GX_10673_SK_frame_991.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_991.cut.vrt GX_10673_SK_frame_991.xyz