#!/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 24.12968357 56.63422331 -gcp 21600.0 0.0 24.11205128 56.7217831 -gcp 21600.0 21849.0 24.28215356 56.73981251 -gcp 0.0 21849.0 24.30932395 56.63931463 GX2261/GX_2261_SK_frame_125.jpg GX_2261_SK_frame_125.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2136.0 2784.0\n1824.0 19800.0\n17544.0 19872.0\n17256.0 2760.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_125.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_125.vrt GX_2261_SK_frame_125.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_125.cut.vrt GX_2261_SK_frame_125.xyz