#!/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 24.9932995 56.6481315 -gcp 21600.0 0.0 24.96261536 56.73219251 -gcp 21600.0 22161.0 25.13388253 56.75957915 -gcp 0.0 22161.0 25.17068377 56.65894961 GX2261/GX_2261_SK_frame_133.jpg GX_2261_SK_frame_133.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1872.0 2928.0\n1992.0 19824.0\n17472.0 19752.0\n17256.0 2760.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_133.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_133.vrt GX_2261_SK_frame_133.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_133.cut.vrt GX_2261_SK_frame_133.xyz