#!/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 25.05759037 57.21977198 -gcp 12009.0 0.0 25.08824928 57.19133707 -gcp 12009.0 12495.0 25.03299435 57.17352616 -gcp 0.0 12495.0 25.00219724 57.20352881 GX18586/GX_18586_SK_frame_40.jpg GX_18586_SK_frame_40.vrt

# Add cutline to VRT
gdalwarp -r $GDAL_SAMPLING_WARP -tps -dstalpha -cutline_srs EPSG:4326 \
  -cutline "POLYGON(($(echo -e "936.0 768.0\n948.0 1692.0\n117.0 1728.0\n168.0 9516.0\n11424.0 9456.0\n11232.0 684.0" | \
  gdaltransform -tps -output_xy GX_18586_SK_frame_40.vrt | \
  awk 'NR==1{first=$0} {printf "%s %s,", $1,$2} END{print " " first}')))" \
  GX_18586_SK_frame_40.vrt GX_18586_SK_frame_40.cut.vrt

# Generate tiles
gdal2tiles.py -r $GDAL_SAMPLING_TILE --xyz -z $GDAL_TILE_ZOOMS -x --processes=$GDAL_TILE_PROCESSES GX_18586_SK_frame_40.cut.vrt GX_18586_SK_frame_40.xyz