#!/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 25.85582972 56.03090985 -gcp 21600.0 0.0 25.89847684 56.04704415 -gcp 21600.0 21975.0 25.92969775 56.02249538 -gcp 0.0 21975.0 25.88515487 56.00455149 GX4599/GX_4599_SD_frame_34.jpg GX_4599_SD_frame_34.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1032.0 3264.0\n1224.0 19680.0\n21456.0 20136.0\n21402.0 2754.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_34.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_34.vrt GX_4599_SD_frame_34.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_34.cut.vrt GX_4599_SD_frame_34.xyz