#!/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 25.4340813 56.77222739 -gcp 21600.0 0.0 25.43550908 56.85673661 -gcp 21600.0 23340.0 25.6048127 56.85470949 -gcp 0.0 23340.0 25.60091387 56.77083022 GX10673/GX_10673_SK_frame_979.jpg GX_10673_SK_frame_979.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "864.0 3384.0\n888.0 20088.0\n20328.0 20184.0\n20208.0 2736.0" | \
  gdaltransform -tps -output_xy GX_10673_SK_frame_979.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10673_SK_frame_979.vrt GX_10673_SK_frame_979.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10673_SK_frame_979.cut.vrt GX_10673_SK_frame_979.xyz