#!/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 23.13185751 57.38169965 -gcp 17754.0 0.0 23.10143977 57.34629102 -gcp 17754.0 17817.0 23.03718292 57.36268929 -gcp 0.0 17817.0 23.06585102 57.39769557 GX18588/GX_18588_SK_frame_51.jpg GX_18588_SK_frame_51.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "4032.0 1488.0\n3528.0 13320.0\n16056.0 13776.0\n16224.0 1824.0" | \
  gdaltransform -tps -output_xy GX_18588_SK_frame_51.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18588_SK_frame_51.vrt GX_18588_SK_frame_51.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18588_SK_frame_51.cut.vrt GX_18588_SK_frame_51.xyz