#!/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 27.74125099 56.54324369 -gcp 21600.0 0.0 27.70381808 56.55635472 -gcp 21600.0 22098.0 27.72536159 56.57677807 -gcp 0.0 22098.0 27.76327729 56.56529979 GX644/GX_644_SD_frame_93.jpg GX_644_SD_frame_93.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "552.0 3324.0\n696.0 19872.0\n20976.0 20124.0\n20700.0 3084.0" | \
  gdaltransform -tps -output_xy GX_644_SD_frame_93.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_644_SD_frame_93.vrt GX_644_SD_frame_93.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_644_SD_frame_93.cut.vrt GX_644_SD_frame_93.xyz