#!/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 25.33812046 57.29913818 -gcp 21111.0 0.0 25.18948283 57.29942795 -gcp 21111.0 21186.0 25.16781058 57.39430571 -gcp 0.0 21186.0 25.36202431 57.39302228 GX954/GX_954_SK_frame_13.jpg GX_954_SK_frame_13.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "552.0 2039.9866592551418\n20592.0 1920.3468593663138\n20664.0 18936.01334074486\n432.0 19152.08004446915" | \
  gdaltransform -tps -output_xy GX_954_SK_frame_13.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_954_SK_frame_13.vrt GX_954_SK_frame_13.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_954_SK_frame_13.cut.vrt GX_954_SK_frame_13.xyz