#!/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 22.36096501 50.08730633 -gcp 21600.0 0.0 22.40478158 50.08385052 -gcp 21600.0 20919.0 22.40057588 50.05751073 -gcp 0.0 20919.0 22.35704362 50.05963568 GX4143/GX_4143_SD_frame_84.jpg GX_4143_SD_frame_84.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "648.0 1944.0\n480.0 20544.0\n21174.0 20658.0\n21198.0 1920.0" | \
  gdaltransform -tps -output_xy GX_4143_SD_frame_84.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4143_SD_frame_84.vrt GX_4143_SD_frame_84.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4143_SD_frame_84.cut.vrt GX_4143_SD_frame_84.xyz