#!/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 27.63638691 56.52302485 -gcp 21600.0 0.0 27.64419838 56.54667879 -gcp 21600.0 22098.0 27.68575499 56.54332124 -gcp 0.0 22098.0 27.6806847 56.51918199 GX644/GX_644_SD_frame_97.jpg GX_644_SD_frame_97.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "648.0 3612.0\n708.0 19992.0\n21000.0 20112.0\n20892.0 3372.0" | \
  gdaltransform -tps -output_xy GX_644_SD_frame_97.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_644_SD_frame_97.vrt GX_644_SD_frame_97.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_644_SD_frame_97.cut.vrt GX_644_SD_frame_97.xyz