#!/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 24.69458342 58.1765753 -gcp 21939.0 0.0 24.6364975 58.17815932 -gcp 21939.0 20811.0 24.63789225 58.20868322 -gcp 0.0 20811.0 24.69948649 58.20698751 GX4194/GX_4194_SG_frame_6.jpg GX_4194_SG_frame_6.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1632.0 2172.0\n1542.0 19074.0\n21936.0 18996.0\n21936.0 2052.0" | \
  gdaltransform -tps -output_xy GX_4194_SG_frame_6.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4194_SG_frame_6.vrt GX_4194_SG_frame_6.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4194_SG_frame_6.cut.vrt GX_4194_SG_frame_6.xyz