#!/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 25.14835022 56.7865698 -gcp 21600.0 0.0 25.14397779 56.70081628 -gcp 21600.0 22038.0 24.97046085 56.69278651 -gcp 0.0 22038.0 24.96802688 56.79813689 GX2261/GX_2261_SK_frame_99.jpg GX_2261_SK_frame_99.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1872.0 2280.0\n1920.0 19848.0\n16800.0 19800.0\n16608.0 2232.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_99.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_99.vrt GX_2261_SK_frame_99.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_99.cut.vrt GX_2261_SK_frame_99.xyz