#!/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 25.52582145 56.33886151 -gcp 21600.0 0.0 25.571419 56.35097913 -gcp 21600.0 21975.0 25.59605777 56.32409578 -gcp 0.0 21975.0 25.54665685 56.31212733 GX4599/GX_4599_SD_frame_16.jpg GX_4599_SD_frame_16.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1056.0 2856.0\n1056.0 19728.0\n21432.0 19944.0\n21354.0 2442.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_16.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_16.vrt GX_4599_SD_frame_16.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_16.cut.vrt GX_4599_SD_frame_16.xyz