#!/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 22.53632784 56.6566275 -gcp 21600.0 0.0 22.50474751 56.64532095 -gcp 21600.0 21729.0 22.48357415 56.66198469 -gcp 0.0 21729.0 22.51484871 56.67482175 GX4596/GX_4596_SD_frame_56.jpg GX_4596_SD_frame_56.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1104.0 3276.0\n924.0 19488.0\n21456.0 19584.0\n21324.0 3204.0" | \
  gdaltransform -tps -output_xy GX_4596_SD_frame_56.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4596_SD_frame_56.vrt GX_4596_SD_frame_56.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4596_SD_frame_56.cut.vrt GX_4596_SD_frame_56.xyz