#!/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 27.07863808 57.22715337 -gcp 21939.0 0.0 27.0351541 57.23358762 -gcp 21939.0 20811.0 27.04654813 57.25547205 -gcp 0.0 20811.0 27.08819747 57.24966843 GX644/GX_644_SD_frame_961.jpg GX_644_SD_frame_961.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "672.0 2496.0\n888.0 18888.0\n21120.0 19032.0\n21192.0 2496.0" | \
  gdaltransform -tps -output_xy GX_644_SD_frame_961.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_644_SD_frame_961.vrt GX_644_SD_frame_961.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_644_SD_frame_961.cut.vrt GX_644_SD_frame_961.xyz