#!/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 27.25143135 57.1464845 -gcp 21600.0 0.0 27.24251032 57.12255525 -gcp 21600.0 22098.0 27.19893343 57.1277768 -gcp 0.0 22098.0 27.20691013 57.15051504 GX644/GX_644_SD_frame_971.jpg GX_644_SD_frame_971.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1056.0 3312.0\n1128.0 19464.0\n20664.0 19632.0\n20616.0 3216.0" | \
  gdaltransform -tps -output_xy GX_644_SD_frame_971.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_644_SD_frame_971.vrt GX_644_SD_frame_971.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_644_SD_frame_971.cut.vrt GX_644_SD_frame_971.xyz