#!/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 24.87195171 56.74269454 -gcp 21540.0 0.0 24.90613128 56.72238738 -gcp 21540.0 21729.0 24.86874033 56.70302366 -gcp 0.0 21729.0 24.83400038 56.72388464 GX4477/GX_4477L_SD_frame_103.jpg GX_4477L_SD_frame_103.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "816.0 2160.0\n816.0 19248.0\n21216.0 19632.0\n21216.0 2616.0" | \
  gdaltransform -tps -output_xy GX_4477L_SD_frame_103.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4477L_SD_frame_103.vrt GX_4477L_SD_frame_103.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4477L_SD_frame_103.cut.vrt GX_4477L_SD_frame_103.xyz