#!/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 25.53628206 56.30546764 -gcp 21600.0 0.0 25.58542013 56.31269266 -gcp 21600.0 21975.0 25.60041904 56.2842191 -gcp 0.0 21975.0 25.54849148 56.27679213 GX4599/GX_4599_SD_frame_18.jpg GX_4599_SD_frame_18.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "18168.0 2784.0\n936.0 2640.0\n744.0 19680.0\n2232.0 19704.0\n2688.0 20592.0\n2736.0 21528.0\n21288.0 21432.0\n21144.0 2808.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_18.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_18.vrt GX_4599_SD_frame_18.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_18.cut.vrt GX_4599_SD_frame_18.xyz