#!/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 23.83211374 56.7618861 -gcp 21600.0 0.0 23.8303113 56.84653121 -gcp 21600.0 23775.0 24.00334597 56.84863169 -gcp 0.0 23775.0 24.00635004 56.76190962 GX10673/GX_10673_SK_frame_008.jpg GX_10673_SK_frame_008.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "756.0 4170.0\n804.0 21348.0\n20568.0 20856.0\n20016.0 3912.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_008.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_008.vrt GX_10673_SK_frame_008.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_008.cut.vrt GX_10673_SK_frame_008.xyz