#!/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 24.10246968 56.95767082 -gcp 21381.0 0.0 24.1548264 56.95900459 -gcp 21381.0 20811.0 24.1571331 56.92996668 -gcp 0.0 20811.0 24.10338163 56.93015987 GX4199/GX_4199_SD_frame_144.jpg GX_4199_SD_frame_144.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "720.0 2616.0\n648.0 18696.0\n20784.0 18360.0\n20640.0 2400.0" | \
  gdaltransform -tps -output_xy GX_4199_SD_frame_144.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4199_SD_frame_144.vrt GX_4199_SD_frame_144.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4199_SD_frame_144.cut.vrt GX_4199_SD_frame_144.xyz