#!/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 23.56819404 57.01502067 -gcp 17754.0 0.0 23.5142621 56.99063056 -gcp 17754.0 17817.0 23.46870885 57.01905809 -gcp 0.0 17817.0 23.52121896 57.04378986 GX18588/GX_18588_SK_frame_23.jpg GX_18588_SK_frame_23.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "3648.0 1872.0\n3576.0 15576.0\n16488.0 15768.0\n16320.0 1776.0" | \
  gdaltransform -tps -output_xy GX_18588_SK_frame_23.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18588_SK_frame_23.vrt GX_18588_SK_frame_23.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18588_SK_frame_23.cut.vrt GX_18588_SK_frame_23.xyz