#!/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 22.41291404 56.73709671 -gcp 21600.0 0.0 22.3776269 56.7350959 -gcp 21600.0 21975.0 22.3737967 56.75514035 -gcp 0.0 21975.0 22.40971684 56.75722831 GX4596/GX_4596_SD_frame_70.jpg GX_4596_SD_frame_70.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "756.0 3372.0\n852.0 19764.0\n1920.0 19800.0\n2580.0 20448.0\n2616.0 21420.0\n21288.0 21504.0\n21300.0 3156.0" | \
  gdaltransform -tps -output_xy GX_4596_SD_frame_70.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4596_SD_frame_70.vrt GX_4596_SD_frame_70.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4596_SD_frame_70.cut.vrt GX_4596_SD_frame_70.xyz