#!/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 24.07628927 56.54730669 -gcp 22935.0 0.0 24.08447317 56.63772094 -gcp 22935.0 20997.0 24.24100822 56.63464065 -gcp 0.0 20997.0 24.23156977 56.54189512 GX10518/GX_10518B_SK_frame_923.jpg GX_10518B_SK_frame_923.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1704.0 2088.0\n1704.0 18912.0\n22152.0 18816.0\n21960.0 1704.0" | \
  gdaltransform -tps -output_xy GX_10518B_SK_frame_923.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10518B_SK_frame_923.vrt GX_10518B_SK_frame_923.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10518B_SK_frame_923.cut.vrt GX_10518B_SK_frame_923.xyz