#!/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 24.83876899 56.92392512 -gcp 21600.0 0.0 24.80742043 56.83926581 -gcp 21600.0 22224.0 24.62768376 56.84971712 -gcp 0.0 22224.0 24.66565395 56.95285489 GX2261/GX_2261_SK_frame_28.jpg GX_2261_SK_frame_28.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2496.0 2040.0\n2352.0 20184.0\n17280.0 20184.0\n17232.0 2064.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_28.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_28.vrt GX_2261_SK_frame_28.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_28.cut.vrt GX_2261_SK_frame_28.xyz