#!/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 24.034239649772644 56.993613355037255 -gcp 21600.0 0.0 24.06002972057503 56.99504729268108 -gcp 21600.0 21975.0 24.06290173530579 56.980812036626375 -gcp 0.0 21975.0 24.037007689476017 56.97914578790199 GX4799/GX_4799_SD_frame_144.jpg GX_4799_SD_frame_144.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "984.0 3000.0\n1104.0 19680.0\n21240.0 19560.0\n20952.0 2940.0" | \
  gdaltransform -tps -output_xy GX_4799_SD_frame_144.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4799_SD_frame_144.vrt GX_4799_SD_frame_144.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4799_SD_frame_144.cut.vrt GX_4799_SD_frame_144.xyz