#!/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 25.0300637 56.30779735 -gcp 21600.0 0.0 25.06472715 56.33039548 -gcp 21600.0 22038.0 25.10764949 56.31119689 -gcp 0.0 22038.0 25.07224275 56.2868337 GX4599/GX_4599_SD_frame_100.jpg GX_4599_SD_frame_100.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "840.0 2736.0\n840.0 19464.0\n21216.0 19584.0\n21324.0 2532.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_100.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_100.vrt GX_4599_SD_frame_100.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_100.cut.vrt GX_4599_SD_frame_100.xyz