#!/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 24.54398322 56.75899692 -gcp 21600.0 0.0 24.50888934 56.67353332 -gcp 21600.0 22161.0 24.32230385 56.69062799 -gcp 0.0 22161.0 24.38273943 56.79131239 GX2261/GX_2261_SK_frame_109.jpg GX_2261_SK_frame_109.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1800.0 2520.0\n1944.0 19752.0\n17160.0 19800.0\n17064.0 2520.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_109.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_109.vrt GX_2261_SK_frame_109.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_109.cut.vrt GX_2261_SK_frame_109.xyz