#!/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 25.49661743 56.77434281 -gcp 21600.0 0.0 25.49819884 56.85868563 -gcp 21600.0 23340.0 25.66700509 56.85537169 -gcp 0.0 23340.0 25.66157385 56.77211119 GX10673/GX_10673_SK_frame_978.jpg GX_10673_SK_frame_978.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1056.0 3504.0\n936.0 20184.0\n20352.0 20184.0\n20184.0 3096.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_978.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_978.vrt GX_10673_SK_frame_978.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_978.cut.vrt GX_10673_SK_frame_978.xyz