#!/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 25.12531041 57.04011625 -gcp 21600.0 0.0 25.13089966 57.12582297 -gcp 21600.0 23901.0 25.30067673 57.12455466 -gcp 0.0 23901.0 25.30195598 57.03882327 GX10525/GX_10525_SK_frame_520.jpg GX_10525_SK_frame_520.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "504.0 3552.0\n348.0 20688.0\n20887.5 20868.0\n20736.0 3480.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_520.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_520.vrt GX_10525_SK_frame_520.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_520.cut.vrt GX_10525_SK_frame_520.xyz