#!/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 25.93437984 57.04184494 -gcp 21600.0 0.0 25.93609093 57.12453747 -gcp 21600.0 22659.0 26.09737637 57.12638742 -gcp 0.0 22659.0 26.09748981 57.03955918 GX10525/GX_10525_SK_frame_507.jpg GX_10525_SK_frame_507.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "1056.0 2976.0\n1224.0 20040.0\n20664.0 20304.0\n20664.0 2760.0" | \
  gdaltransform -tps -output_xy GX_10525_SK_frame_507.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_10525_SK_frame_507.vrt GX_10525_SK_frame_507.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_10525_SK_frame_507.cut.vrt GX_10525_SK_frame_507.xyz