#!/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 24.75232801 56.85185952 -gcp 21600.0 0.0 24.71521646 56.76778856 -gcp 21600.0 22161.0 24.53800631 56.78168108 -gcp 0.0 22161.0 24.58137751 56.88415807 GX2261/GX_2261_SK_frame_69.jpg GX_2261_SK_frame_69.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1824.0 2592.0\n2400.0 20184.0\n17256.0 20040.0\n17304.0 2280.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_69.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_69.vrt GX_2261_SK_frame_69.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_69.cut.vrt GX_2261_SK_frame_69.xyz