#!/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 25.81164837 56.7780897 -gcp 21600.0 0.0 25.82093954 56.86124374 -gcp 21600.0 24024.0 25.99013329 56.85466258 -gcp 0.0 24024.0 25.98127127 56.77211711 GX10673/GX_10673_SK_frame_972.jpg GX_10673_SK_frame_972.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "366.0 3558.0\n312.0 20712.0\n20544.0 20784.0\n20400.0 3192.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_972.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_972.vrt GX_10673_SK_frame_972.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_972.cut.vrt GX_10673_SK_frame_972.xyz