#!/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 24.73125228 56.92758706 -gcp 21600.0 0.0 24.69794653 56.84387517 -gcp 21600.0 22098.0 24.51997433 56.85409518 -gcp 0.0 22098.0 24.55732156 56.95864379 GX2261/GX_2261_SK_frame_30.jpg GX_2261_SK_frame_30.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "2592.0 1896.0\n2352.0 20136.0\n17376.0 20328.0\n17160.0 1968.0" | \
  gdaltransform -tps -output_xy GX_2261_SK_frame_30.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2261_SK_frame_30.vrt GX_2261_SK_frame_30.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2261_SK_frame_30.cut.vrt GX_2261_SK_frame_30.xyz