#!/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 25.0114274 56.97713463 -gcp 21414.0 0.0 25.01091242 57.07502358 -gcp 21414.0 21666.0 25.18338919 57.07269089 -gcp 0.0 21666.0 25.18714428 56.98226768 GX2206/GX_2206_SK_frame_36.jpg GX_2206_SK_frame_36.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1008.0 2760.0\n960.0 19248.0\n21072.0 19440.0\n21096.0 2928.0" | \
  gdaltransform -tps -output_xy GX_2206_SK_frame_36.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_2206_SK_frame_36.vrt GX_2206_SK_frame_36.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_2206_SK_frame_36.cut.vrt GX_2206_SK_frame_36.xyz