#!/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 24.37878013 57.7290227 -gcp 21600.0 0.0 24.32384322 57.72930044 -gcp 21600.0 21852.0 24.3239252 57.75892703 -gcp 0.0 21852.0 24.37927365 57.75881521 GX4195/GX_4195_SD_frame_18.jpg GX_4195_SD_frame_18.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "864.0 3324.0\n888.0 19584.0\n21372.0 19656.0\n21264.0 3048.0" | \
  gdaltransform -tps -output_xy GX_4195_SD_frame_18.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4195_SD_frame_18.vrt GX_4195_SD_frame_18.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4195_SD_frame_18.cut.vrt GX_4195_SD_frame_18.xyz