#!/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 24.37595308 57.75281917 -gcp 21600.0 0.0 24.32177971 57.75265273 -gcp 21600.0 21852.0 24.32100293 57.78243029 -gcp 0.0 21852.0 24.37667946 57.78283024 GX4195/GX_4195_SD_frame_20.jpg GX_4195_SD_frame_20.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "768.0 3528.0\n1008.0 19416.0\n21456.0 19680.0\n21336.0 2880.0" | \
  gdaltransform -tps -output_xy GX_4195_SD_frame_20.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4195_SD_frame_20.vrt GX_4195_SD_frame_20.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4195_SD_frame_20.cut.vrt GX_4195_SD_frame_20.xyz