#!/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 27.75229633 56.573108 -gcp 21600.0 0.0 27.70856559 56.57425162 -gcp 21600.0 22098.0 27.71111557 56.59829905 -gcp 0.0 22098.0 27.7533897 56.59752664 GX644/GX_644_SD_frame_91.jpg GX_644_SD_frame_91.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "576.0 3120.0\n600.0 19764.0\n20676.0 19800.0\n20808.0 3036.0" | \
  gdaltransform -tps -output_xy GX_644_SD_frame_91.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_644_SD_frame_91.vrt GX_644_SD_frame_91.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_644_SD_frame_91.cut.vrt GX_644_SD_frame_91.xyz