#!/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 24.07216072 56.98386371 -gcp 21381.0 0.0 24.12402391 56.98615522 -gcp 21381.0 20811.0 24.12853003 56.95822071 -gcp 0.0 20811.0 24.07702088 56.95572857 GX4199/GX_4199_SD_frame_140.jpg GX_4199_SD_frame_140.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "672.0 2136.0\n792.0 18696.0\n20568.0 18648.0\n20616.0 2136.0" | \
  gdaltransform -tps -output_xy GX_4199_SD_frame_140.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4199_SD_frame_140.vrt GX_4199_SD_frame_140.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4199_SD_frame_140.cut.vrt GX_4199_SD_frame_140.xyz