#!/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 22.13401968 56.99275512 -gcp 21600.0 0.0 22.88468849 56.71022283 -gcp 21600.0 20982.0 22.87185933 56.63156449 -gcp 0.0 20982.0 22.31968811 56.51942564 GX2685/GX_2685A_SK_frame_99.jpg GX_2685A_SK_frame_99.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "8352.0 1104.0\n8448.0 20640.0\n21348.0 20472.0\n21228.0 1008.0" | \
  gdaltransform -tps -output_xy GX_2685A_SK_frame_99.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2685A_SK_frame_99.vrt GX_2685A_SK_frame_99.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2685A_SK_frame_99.cut.vrt GX_2685A_SK_frame_99.xyz