#!/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 25.00476261 56.92022785 -gcp 21600.0 0.0 24.97019351 56.83600006 -gcp 21600.0 22224.0 24.79422232 56.84909988 -gcp 0.0 22224.0 24.83425414 56.9504473 GX2261/GX_2261_SK_frame_25.jpg GX_2261_SK_frame_25.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2640.0 1776.0\n2304.0 20064.0\n17400.0 19848.0\n17376.0 1872.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_25.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_25.vrt GX_2261_SK_frame_25.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_25.cut.vrt GX_2261_SK_frame_25.xyz