#!/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 22.41922259 56.71078937 -gcp 21600.0 0.0 22.38789439 56.70137807 -gcp 21600.0 21975.0 22.37026422 56.71969231 -gcp 0.0 21975.0 22.40328632 56.7283846 GX4596/GX_4596_SD_frame_68.jpg GX_4596_SD_frame_68.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 3648.0\n708.0 20016.0\n2010.0 20016.0\n2676.0 20634.0\n2664.0 21726.0\n21552.0 21744.0\n21144.0 3528.0" | \
  gdaltransform -tps -output_xy GX_4596_SD_frame_68.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4596_SD_frame_68.vrt GX_4596_SD_frame_68.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4596_SD_frame_68.cut.vrt GX_4596_SD_frame_68.xyz