#!/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 23.17101359 56.50455823 -gcp 13947.0 0.0 23.36970627 56.54577209 -gcp 13947.0 14082.0 23.44232976 56.46953465 -gcp 0.0 14082.0 23.30646154 56.40929177 GX2685/GX_2685A_SK_frame_78.jpg GX_2685A_SK_frame_78.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1416.0 387.0\n13704.0 407.9197771587742\n13776.0 13776.0\n1728.0 13800.093593314763" | \
  gdaltransform -tps -output_xy GX_2685A_SK_frame_78.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2685A_SK_frame_78.vrt GX_2685A_SK_frame_78.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2685A_SK_frame_78.cut.vrt GX_2685A_SK_frame_78.xyz