#!/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 25.75952182 56.12527359 -gcp 21600.0 0.0 25.78919685 56.14816851 -gcp 21600.0 21975.0 25.83332048 56.13130936 -gcp 0.0 21975.0 25.80204606 56.10704513 GX4599/GX_4599_SD_frame_29.jpg GX_4599_SD_frame_29.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "792.0 3048.0\n672.0 19584.0\n21096.0 19920.0\n21288.0 2856.0" | \
  gdaltransform -tps -output_xy GX_4599_SD_frame_29.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4599_SD_frame_29.vrt GX_4599_SD_frame_29.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4599_SD_frame_29.cut.vrt GX_4599_SD_frame_29.xyz