#!/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 22.58080959 56.66176948 -gcp 21600.0 0.0 22.59964943 56.68118118 -gcp 21600.0 21729.0 22.63707161 56.67038897 -gcp 0.0 21729.0 22.61660099 56.65090092 GX4596/GX_4596_SD_frame_52.jpg GX_4596_SD_frame_52.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "17616.0 3048.0\n17424.0 1152.0\n2856.0 1152.0\n2712.0 2256.0\n768.0 2304.0\n924.0 19668.0\n2592.0 19680.0\n2664.0 21432.0\n21432.0 21264.0\n21120.0 2976.0" | \
  gdaltransform -tps -output_xy GX_4596_SD_frame_52.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_4596_SD_frame_52.vrt GX_4596_SD_frame_52.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_4596_SD_frame_52.cut.vrt GX_4596_SD_frame_52.xyz