#!/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 24.38734862 56.97349687 -gcp 21414.0 0.0 24.42185457 57.0696957 -gcp 21414.0 21603.0 24.59104518 57.05014337 -gcp 0.0 21603.0 24.56323587 56.95921639 GX2206/GX_2206_SK_frame_48.jpg GX_2206_SK_frame_48.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 2880.0\n792.0 19056.0\n21024.0 18936.0\n21024.0 2760.0" | \
  gdaltransform -tps -output_xy GX_2206_SK_frame_48.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2206_SK_frame_48.vrt GX_2206_SK_frame_48.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2206_SK_frame_48.cut.vrt GX_2206_SK_frame_48.xyz